Journals >Chinese Optics Letters
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2010
Volume: 8 Issue 4
27 Article(s)
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Research Article
VNIR image simulation based on low-level flight image data
Dongying Zhang, Weining Yi, Jin Hong, Lili Du... and Yanli Qiao|Show fewer author(s)
A simulation method for visible and near infrared (VNIR) image is mentioned. The VNIR image obtained by low-level flight is adopted as data resource. After atmospheric correction, the ground reflectivity can be deducted. The simulation method consists of four steps: radiative transfer, spatial resolution, modulation trA simulation method for visible and near infrared (VNIR) image is mentioned. The VNIR image obtained by low-level flight is adopted as data resource. After atmospheric correction, the ground reflectivity can be deducted. The simulation method consists of four steps: radiative transfer, spatial resolution, modulation transfer function, and noise simulation. The image of satellite-borne or high-level air-borne sensor could be generated by the simulation method from VNIR image. Experiment is carried out to test the method using an airship as platform. The resulting simulated image is compared to the image with quickbird panchromatic band. The result shows that simulation images enables one to effectively reproduce the entire process of remote sensing of the Earth. The method can be used to simulate VNIR image at satellite level at the same area and the same wavelength..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 345 (2010)
Pulse loading 87Rb Bose-Einstein condensation in optical lattice: the Kapitza-Dirac scattering and temporal matter-wave-dispersion Talbot ef fect
Haixia Chen, Dezhi Xiong, Pengjun Wang, and Jing Zhang
We study <sup>87</sup>Rb Bose-Einstein condensation (BEC) loading into the pulse of the one-dimensional (1D) optical lattice experimentally. The lattice is turned on abruptly, held constant for a variable time, and then turned off abruptly. The measurement of the depth of the optical lattice is obtained by We study <sup>87</sup>Rb Bose-Einstein condensation (BEC) loading into the pulse of the one-dimensional (1D) optical lattice experimentally. The lattice is turned on abruptly, held constant for a variable time, and then turned off abruptly. The measurement of the depth of the optical lattice is obtained by Kapitza-Dirac scattering. The temporal matter-wave-dispersion Talbot effect with <sup>87</sup>Rb BEC is observed by applying a pair of pulsed standing waves (as pulsed phase gratings) with the separation of a variable delay..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 348 (2010)
Evaporative cooling rubidium atoms with microwave radiation
Dezhi Xiong, Pengjun Wang, Haixia Chen, and Jing Zhang
We report the experimental achievement of <sup>87</sup>Rb Bose-Einstein condensation in a magnetic trap with microwave and radio frequency (RF) induced evaporation. Evaporative cooling is realized by using 6.8 GHz microwave radiation driving the <sup>87</sup>Rb atoms to transit from the ground-sWe report the experimental achievement of <sup>87</sup>Rb Bose-Einstein condensation in a magnetic trap with microwave and radio frequency (RF) induced evaporation. Evaporative cooling is realized by using 6.8 GHz microwave radiation driving the <sup>87</sup>Rb atoms to transit from the ground-state hyperfine state |F = 2,mF =2> to |F = 1,mF = 1>. Compared with RF-induced evaporation, <sup>87</sup>Rb atoms are hardly to achieve pure condensate by microwave evaporation cooling due to the effect of atoms in the |F = 1,mF = 1> state being pumped back into the trapping |F = 2,mF = 1> state..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 351 (2010)
Influence of thermal effect on multi-junction GaInP/GaAs/Ge concentrating photovoltaic system
Qinfeng Xu, Qing Ye, Ronghui Qu, and Zujie Fang
The influence of thermal effect on the energy conversion efficiency of concentrating photovoltaic system for multi-junction GaInP/GaAs/Ge thin-film solar cell is analyzed experimentally. With the increment of operation temperature, the maximal energy conversion efficiency and optimal loaded resistor will be changed. UnThe influence of thermal effect on the energy conversion efficiency of concentrating photovoltaic system for multi-junction GaInP/GaAs/Ge thin-film solar cell is analyzed experimentally. With the increment of operation temperature, the maximal energy conversion efficiency and optimal loaded resistor will be changed. Under the condition of operation temperature lower than 90℃, this influence of thermal effect is very small. However, when the operation temperature exceeds 90℃, the maximal conversion efficiency of the cells will decrease sharply, and contrarily the corresponding optimal loaded resistor will increase quickly. Then the system performance will degenerate badly and a thermal management will be necessary..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 354 (2010)
Biocompatible and stable core/shell drug nanocarrier with high surface-enhanced Raman scattering activity
Xuebin Tan, Zhuyuan Wang, Hong Wang, Jing Yang... and Yiping Cui|Show fewer author(s)
A novel drug carrier based on SiO2-coated silver nanoparticle aggregates and antitumor drug is successfully synthesized. The surface-enhanced Raman scattering (SERS) spectra of the antitumor drug in living cells are obtained. By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a grA novel drug carrier based on SiO2-coated silver nanoparticle aggregates and antitumor drug is successfully synthesized. The surface-enhanced Raman scattering (SERS) spectra of the antitumor drug in living cells are obtained. By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a great improvement of SERS signal intensity is achieved. It is found that the chemical stability of the drug carrier can also be increased with the existence of SiO2 shell. The adsorbing effect between antitumor drug 9-aminoacridine (9AA) and silver particles is investigated to optimize the SERS signal. The core/shell structure of the drug carrier is characterized by ultraviolet-visible (UV-Vis) spectroscopy and transmission electron microscopy (TEM) pictures. The experimental results show that the drug carrier offers biocompatibility, stability, and high SERS activity, holding the potential for realizing the intracellular drug tracing..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 357 (2010)
Influence of annealing temperature on the performance of Ge film and photon-counting imaging system
Feifei Zhao, Baosheng Zhao, Xiaofeng Sai, Xinghua Zhang... and Wei Zou|Show fewer author(s)
Compared with the traditional image intensifier with phosphor screen readout, the photon-counting imaging detector with charge induction readout is more beneficial in several aspects (e.g., good imaging properties and time resolution) to astronomy, reconnaissance, bioluminescence, and materials research. However, the aCompared with the traditional image intensifier with phosphor screen readout, the photon-counting imaging detector with charge induction readout is more beneficial in several aspects (e.g., good imaging properties and time resolution) to astronomy, reconnaissance, bioluminescence, and materials research. However, the annealing temperature during the tube-making process can affect the properties of the Ge film, and consequently impair the performance of the detector. Therefore, the influence of annealing temperature on Ge film and on the detector is studied in order to determine the crucial parameters. The Ge films are prepared on ceramic and quartz glass by the use of an electron gun. They are analyzed by scanning electron microscope (SEM), high-resistance meter, and X-ray diffraction (XRD). The results show that the optimum substrate and annealing temperature are ceramic plate and 250 ℃, respectively..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 361 (2010)
Stimulated Brillouin scattering effect on gain saturation of distributed fiber Raman amplifiers
Wei Chen, Keyan Wang, and Zhou Meng
Gain saturation is a significant phenomenon of fiber Raman amplifiers (FRAs). Gain figures versus signal power are well explained. For the small signal, the coupled ordinary differential equations are used, and for the large signal, the Raman gain coefficient is modified. It is shown that the saturation power of FRAs dGain saturation is a significant phenomenon of fiber Raman amplifiers (FRAs). Gain figures versus signal power are well explained. For the small signal, the coupled ordinary differential equations are used, and for the large signal, the Raman gain coefficient is modified. It is shown that the saturation power of FRAs decreases with the pump power, and gain saturation is easier to occur in the forward pump scheme than in the backward pump scheme. These phenomena are well explained by the stimulated Brillouin scattering (SBS) effect. This research provides a guide to the fabrication of practical FRAs..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 365 (2010)
Wavelength conversion of chaotic message through gain modulation by injection-locked Fabry-Perot laser diode
Yanqing Ding, Anbang Wang, Mingjiang Zhang, Hucheng He... and Yuncai Wang|Show fewer author(s)
We propose a wavelength conversion scheme for chaotic optical communications (COC) based on a Fabry-Perot (FP) laser diode. The FP laser, as a wavelength converter, is injection-locked at one of longitudinal modes by an external continuous-wave (CW) light. The simulation results demonstrated that the chaos masked signaWe propose a wavelength conversion scheme for chaotic optical communications (COC) based on a Fabry-Perot (FP) laser diode. The FP laser, as a wavelength converter, is injection-locked at one of longitudinal modes by an external continuous-wave (CW) light. The simulation results demonstrated that the chaos masked signal at wavelength \lambda1, which corresponds to the other longitudinal mode of FP laser, can be converted to the injection-locked mode (wavelength \lambda 2) based on cross-gain modulation in a closed-loop COC link. A 1.2-GHz chaos masked sinusoidal signal is successfully decoded with signal-to-noise ratio (SNR) beyond 8 dB in 15-nm wavelength conversion range, and the effects of SNR on the signal frequency and conversion span are also investigated..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 368 (2010)
Design of contention resolution over backup path in path computation element based wavelength-switched optical networks
Lianxing Hou, Yueming Lu, Junhua Wang, and Yuefeng Ji
A contention resolution scheme, P-cycle auto-switching (PCAS), is proposed in wavelength-switched optical networks (WSONs) based on generalized multi-protocol label switching (GMPLS) to solve backward blocking. This system permits the preferable request and switches the other to a backup path generated by the P-cycle. A contention resolution scheme, P-cycle auto-switching (PCAS), is proposed in wavelength-switched optical networks (WSONs) based on generalized multi-protocol label switching (GMPLS) to solve backward blocking. This system permits the preferable request and switches the other to a backup path generated by the P-cycle. Simulation results show that the PCAS scheme is effective in mitigating backward blocking, especially under concentrated load..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 372 (2010)
Predistortion of high speed optical OFDM signal for aliasing-free receiving in multiple low-bandwidth receiver system
Lin Cheng, He Wen, Xiaoping Zheng, Hanyi Zhang, and Yili Guo
A cost-effective method of multi-receiver optical orthogonal frequency-division multiplexing (OOFDM) system is proposed to reduce the requirement for the speed of the receiver and the size of fast Fourier transform (FFT). The sampling rate of analog-to-digital converters (ADCs) can be reduced to 1/N of the original sigA cost-effective method of multi-receiver optical orthogonal frequency-division multiplexing (OOFDM) system is proposed to reduce the requirement for the speed of the receiver and the size of fast Fourier transform (FFT). The sampling rate of analog-to-digital converters (ADCs) can be reduced to 1/N of the original signal bandwidth in an N-receiver system. Aided by signal predistortion at the transmitter, aliasing-free signal can be retrieved independently and directly at the low speed receivers. A back-to-back experimental result is given for a two-receiver system. The effect of the electrical filters added before the ADC is studied and the analysis for filters optimization is given..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 377 (2010)
Rate-oriented perceptual image coding using contrast-based quantization
Weiyu Yu, and Jing Tian
A new image coding approach is proposed by controlling the quantization step via minimizing the perceptual distortions (in terms of image’s contrast measurement). The proposed method is a rate-oriented contrast-based approach, which is in contrast to the conventional quality-oriented contrast-based image coding. The alA new image coding approach is proposed by controlling the quantization step via minimizing the perceptual distortions (in terms of image’s contrast measurement). The proposed method is a rate-oriented contrast-based approach, which is in contrast to the conventional quality-oriented contrast-based image coding. The algorithm achieves a higher perceptual quality performance against several methods developed previously..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 381 (2010)
Multispectral image fusion method based on intensity-hue-saturation and nonsubsampled three-channels non-separable wavelets
Bin Liu, Weijie Liu, and Jiaxiong Peng
A new multispectral image fusion method based on intensity-hue-saturation (IHS) transform and three-channel non-separable wavelets whose dilation matrix is [2,1;–1,1] is proposed. The multi-resolution decompositions of the intensity of multispectral image and panchromatic image are performed in nonsubsampled mode usingA new multispectral image fusion method based on intensity-hue-saturation (IHS) transform and three-channel non-separable wavelets whose dilation matrix is [2,1;–1,1] is proposed. The multi-resolution decompositions of the intensity of multispectral image and panchromatic image are performed in nonsubsampled mode using the three-channel non-separable wavelet filter bank. The approximation images and the detail images of the multi-resolution pyramids are fused. The experimental results show that this method has good visual effect. The performance outperforms the IHS fusion method, the discrete wavelet transform (DWT) fusion method, and the IHS-DWT fusion method in preserving spectral quality and high spatial resolution information..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 384 (2010)
Radiometric compensation algorithm for color reproduction of projection display on patterned surface
Wenhai Zou, Haisong Xu, and Weige Lv
A novel radiometric compensation algorithm is proposed to correct the color distortions of the projection display on patterned surface. Two choices of the objective image are investigated in this algorithm. A linear compression followed by a sigmoid-function transformation based on the statistical parameters of the comA novel radiometric compensation algorithm is proposed to correct the color distortions of the projection display on patterned surface. Two choices of the objective image are investigated in this algorithm. A linear compression followed by a sigmoid-function transformation based on the statistical parameters of the compensating radiance map is performed to reduce the clippings of the compensating color and expected to properly reproduce the dynamic range and the visibility of the image content. Three types of projection displays are produced for each test image. The parameter analysis indicates that the compensated displays could well conceal the surface pattern and tend to exhibit higher lightness or lightness contrast in the camera. The comparison results in a psychophysical experiment demonstrate that all the compensated displays outperform the uncompensated ones. The original input images seem more appropriate to be selected as the objective images, and the predicted objectives on the white screen are just proper for the bright and low-contrast input images displayed on the faint surface..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 388 (2010)
Novel optical fiber current sensor based on magnetic fluid
Tao Hu, Yong Zhao, Xing Li, Jingjing Chen, and Zhiwei Lv
A novel fiber optic Fabry-Perot (F-P) current sensor is developed based on magnetic fluid as the medium in F-P interference cavity. A signal demodulation method based on slanted fiber Bragg grating (FBG) wavelength measurement system is proposed. Theory and principle of electromagnetic-controlled refractive index of thA novel fiber optic Fabry-Perot (F-P) current sensor is developed based on magnetic fluid as the medium in F-P interference cavity. A signal demodulation method based on slanted fiber Bragg grating (FBG) wavelength measurement system is proposed. Theory and principle of electromagnetic-controlled refractive index of the magnetic fluid is described, as well as the structure of the sensor system. Preliminary experiments are carried out, and the results indicate that there is a fairly good linearity of the measurement characteristic. The thickness of magnetic fluid film and initial concentration will affect the measurement results..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 392 (2010)
Effect of coating thickness on the calibration and measurement uncertainty of a wide-band liquid crystal thermography
Yu Rao, Shusheng Zang, and Chaoyi Wan
The liquid crystal thermography is a high-resolution and non-intrusive optical technique for full-field temperature measurement. We present detailed calibration data for a wide-bandwidth thermochromic liquid crystal (TLC) to investigate the effect of the coating thickness on the hue-temperature characteristics and the The liquid crystal thermography is a high-resolution and non-intrusive optical technique for full-field temperature measurement. We present detailed calibration data for a wide-bandwidth thermochromic liquid crystal (TLC) to investigate the effect of the coating thickness on the hue-temperature characteristics and the measurement uncertainty of the TLC. It is found that the coating thickness has appreciable effect on the TLC hue-temperature curve. For TLC coatings with the thickness over 20 μm, a thicker TLC coating shows a relatively smaller measurement uncertainty, but the effect of the coating thickness is non-distinctive on the measurement uncertainty..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 395 (2010)
Novel method for measurement of effective cavity length of DBR fiber
Qing Ji, Xiurong Ma, Jing Sun, Hao Zhang, and Ying Yao
A novel method to measure the effective cavity length of distributed Bragg reflector (DBR) fiber laser with fiber Bragg grating (FBG) Fabry-Perot cavity as the resonator is proposed. The effective cavity length of DBR fiber laser is accurately measured by measuring the frequency spacing of two adjacent longitudinal modA novel method to measure the effective cavity length of distributed Bragg reflector (DBR) fiber laser with fiber Bragg grating (FBG) Fabry-Perot cavity as the resonator is proposed. The effective cavity length of DBR fiber laser is accurately measured by measuring the frequency spacing of two adjacent longitudinal modes in the cavity without the precise physical length of FBGs. The measuring accuracy as high as 10<sup>-5</sup> mm can be obtained by setting the resolution bandwidth of the spectrum analyzer..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 398 (2010)
High power vertical-external-cavity surface-emitting laser
Peng Zhang, Yanrong Song, Xinping Zhang, Jinrong Tian, and Zhigang Zhang
A high power optically-pumped vertical-external-cavity surface-emitting laser with a diamond heatspreader is demonstrated. Owing to the good thermal conductivity, diamond can accelerate the dissipation of heat in the active region and increase the output power significantly. The effects of the curvature radius, the traA high power optically-pumped vertical-external-cavity surface-emitting laser with a diamond heatspreader is demonstrated. Owing to the good thermal conductivity, diamond can accelerate the dissipation of heat in the active region and increase the output power significantly. The effects of the curvature radius, the transmission of output coupler, the spot size of the pump, and the temperature of the heat sink on the output power are investigated. A maximum output power of 880 mW is obtained under the conditions of 10℃ temperature, 15-mm curvature radius, 3% transmission of the output coupler, and 8500-mW pump power. The slope efficiency and the optical-to-optical conversion efficiency of the laser are about 17% and 15%, respectively..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 401 (2010)
Experimental study on high power all-fiber laser
Baoyin Zhao, Kailang Duan, Wei Zhao, Cheng Li, and Yishan Wang
A high power all-fiber laser is experimentally studied. A monolithic fiber laser system with only one stage of resonator cavity is constructed and 404-W continuous wave (CW) output power is obtained. Its opticalto-optical conversion efficiency is up to 64%. The laser central wavelength is at 1081 nm with the spectral fA high power all-fiber laser is experimentally studied. A monolithic fiber laser system with only one stage of resonator cavity is constructed and 404-W continuous wave (CW) output power is obtained. Its opticalto-optical conversion efficiency is up to 64%. The laser central wavelength is at 1081 nm with the spectral full-width at half-maximum (FWHM) of 2 nm. The laser setup can work with excellent stability; in the long time of high power operation, no thermal distortions or damages are observed..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 404 (2010)
Automated damage diagnostic system for laser damage threshold tests
Xiaofeng Liu, Dawei Li, Yuan’an Zhao, Xiao Li... and Jianda Shao|Show fewer author(s)
An automated damage diagnostic system for collecting plasma flash is developed to diagnose damage in a laser-induced damage threshold (LIDT) test system. Experiment is done to verify the accuracy of this system and analyze the relationship between the plasma signals and the damage morphologies. The results obtained by An automated damage diagnostic system for collecting plasma flash is developed to diagnose damage in a laser-induced damage threshold (LIDT) test system. Experiment is done to verify the accuracy of this system and analyze the relationship between the plasma signals and the damage morphologies. The results obtained by the system are found to be in excellent agreement with those obtained by the much laborious method of Normaski microscope. Results show that plasma signals above 1 V correspond to the damage morphology of surface discolorations with or without pits in their centers, and plasma signals below or just around 1 V correspond to the damage morphology of pits. The misdiagnosis is attributed to contaminations and air breakdown..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 407 (2010)
High energy optically pumped NH3 terahertz laser with simple cavity
Liang Miao, Duluo Zuo, Zhixian Jiu, Zuhai Cheng... and Junzhu Wu|Show fewer author(s)
A high energy pulsed terahertz (THz) laser is studied experimentally. The laser cavity simply consists of a quartz glass waveguide, a coated GaAs input window, and a crystal quartz output window. NH<sub>3</sub> is filled in the cavity as gain medium, and pumped by an 8-J line-tunable transversely excited atA high energy pulsed terahertz (THz) laser is studied experimentally. The laser cavity simply consists of a quartz glass waveguide, a coated GaAs input window, and a crystal quartz output window. NH<sub>3</sub> is filled in the cavity as gain medium, and pumped by an 8-J line-tunable transversely excited atmospheric (TEA) CO<sub>2</sub> laser. When 9R(16) transition acts as the pump line, 55.6-mJ THz radiation (90 \mu m) is obtained at 730-Pa NH<sub>3</sub> pressure. The corresponding conversion efficiency is 13.54%. Energy and optimal pressure of amplified spontaneous emission and laser oscillation are compared..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 411 (2010)
Growth and characterization of high-quality Mn-doped LiAlO2 single crystal
Hao Teng, Shengming Zhou, Hui Lin, Tingting Jia... and Jun Wang|Show fewer author(s)
The growth of a Mn-doped LiAlO<sub>2</sub> single crystal by the Czochralski (CZ) method and the characterization of its spectroscopy and thermoluminescence (TL) are presented. The X-ray rocking curve and chemical etching analysis show that the as-grown crystal has good crystallinity. The full-width at halfThe growth of a Mn-doped LiAlO<sub>2</sub> single crystal by the Czochralski (CZ) method and the characterization of its spectroscopy and thermoluminescence (TL) are presented. The X-ray rocking curve and chemical etching analysis show that the as-grown crystal has good crystallinity. The full-width at half-maximum (FWHM) of the LiAlO<sub>2</sub> (200) \omega rocking curve is 23.2 arcsec and the etching pits density of the (100) plane is (1.6–4.0)×10<sup>4</sup> cm<sup>-2</sup>. The transmission spectrum indicates that the crystal is highly transparent in the 200–1500-nm wavelength range. The emission spectrum of the crystal consists of a peak around 579 nm when excited with 428-nm light. The TL spectra show that the LiAlO<sub>2</sub>:Mn crystal has glow peaks at 150 and 172 ℃. The change of TL characteristics of the crystal before and after thermal annealing in the air is discussed, and the effect of annealing and irradiation on the evolution of defect types is analyzed..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 414 (2010)
Using OCT image to distinguish human acupoint from non-acupoint tissues after irradiation with laser in vivo:a pilot study
Huiqing Zhong, Zude Zhang, Zhouyi Guo, Huajiang Wei... and Songhao Liu|Show fewer author(s)
Using the optical coherence tomography (OCT) images, the optical attenuation coefficients (\mu t) of human Laogong acupoint and non-acupoint tissues are measured after empty irradiation and 808-nm 100-mW irradiation for 10 min in vivo non-invasively. The results show that there is no significant difference of \mu t of Using the optical coherence tomography (OCT) images, the optical attenuation coefficients (\mu t) of human Laogong acupoint and non-acupoint tissues are measured after empty irradiation and 808-nm 100-mW irradiation for 10 min in vivo non-invasively. The results show that there is no significant difference of \mu t of Laogong acupoint and non-acupoint tissues after empty irradiation. However, there are significant differences of \mu t between Laogong acupoint and non-acupoint tissues after laser irradiation at the power of 100 mW (statistical definition of probability p < 0.01). The results of the pilot study indicate that the OCT could distinguish the acupoint from the surrounding tissues after irradiation with laser in vivo non-invasively..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 418 (2010)
Reference point of floating-reference method for blood glucose sensing
Yue Yang, Wenliang Chen, Zhenzhi Shi, and Kexin Xu
A problem in terms of the accuracy of noninvasive measurement of blood glucose with near-infrared (NIR) spectroscopy is mainly caused by the weak glucose signal and strong background variations. We report the existence of the radial reference point in a floating-reference method, which is supposed to solve this problemA problem in terms of the accuracy of noninvasive measurement of blood glucose with near-infrared (NIR) spectroscopy is mainly caused by the weak glucose signal and strong background variations. We report the existence of the radial reference point in a floating-reference method, which is supposed to solve this problem. Based on the analysis of the infinite diffusion theory, the local condition of the reference point is deduced theoretically. Then the experiments using the intralipid solutions are constructed to testify the existence of the reference point. In order to further validate our results, Monte Carlo simulations are performed to calculate the diffused light distribution according to the variation of the glucose concentration in the intralipid solutions. All the reference points existing in three-layer skin model are also listed at the wavelength of 1200-1700 nm..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 421 (2010)
Terahertz transmission properties of Cr ion implantation glass
Hong Su, Hang Zhou, Shixing Wang, Qiongzhou Chen... and Shuangchen Ruan|Show fewer author(s)
Cr ion implantations in glass with the different doses of D=1.493×10<sup>17</sup> and 4.976×10<sup>17</sup> ion/cm<sup>2</sup> are obtained by metal vapor vacuum arc (MEVVA). The effects of the different Cr ion implanted doses on terahertz (THz) transmission property are anCr ion implantations in glass with the different doses of D=1.493×10<sup>17</sup> and 4.976×10<sup>17</sup> ion/cm<sup>2</sup> are obtained by metal vapor vacuum arc (MEVVA). The effects of the different Cr ion implanted doses on terahertz (THz) transmission property are analyzed from THz time-domain spectroscopy. The results show that the more the Cr ion implanted dose in the micro-area implantation glasses, the larger the THz transmission except the larger absorption at 0.24 THz. This is an effect attributed to the coupling of plasmas on both the implantation and the implantation affected zones of the Cr ion implantation glass..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 425 (2010)
Suppressing the disturbance in the transmission spectrum of Glan-Thompson-type prism polarizers
Hongxia Li, Jiyang Fan, Fufang Su, Fuquan Wu, and Shining Zhu2**
We analyze the random disturbance in the transmission of light through a spinning Glan-Thompsontype prism polarizer. The disturbance makes the dependence of the transmission on the rotation angle significantly deviates from the Malus cosine-squared law and severely spoils the output light quality. Slight vibration of tWe analyze the random disturbance in the transmission of light through a spinning Glan-Thompsontype prism polarizer. The disturbance makes the dependence of the transmission on the rotation angle significantly deviates from the Malus cosine-squared law and severely spoils the output light quality. Slight vibration of the polarizer as it rotates combing the multi-beam-interference effect raises the disturbance. Further analysis reveals the sensitive dependence of the disturbance on the composing material of the prism gap, and the appropriate selection of such material can make the disturbance minimize to very desirable levels. The model results show quite good agreement with experiments..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 428 (2010)
Photonic band gap from periodic structures containing anisotropic nonmagnetic left-handed metamaterial
Tingting Tang, Fushen Chen, and Bao Sun
We demonstrate a photonic band gap (PBG) from one-dimensional (1D) periodic structures created by a double-layer unit cell with an air layer and an anisotropic nonmagnetic left-handed metamaterial (LHM) layer whose permittivity elements are partially negative. The requirements imposed on the materials and structures toWe demonstrate a photonic band gap (PBG) from one-dimensional (1D) periodic structures created by a double-layer unit cell with an air layer and an anisotropic nonmagnetic left-handed metamaterial (LHM) layer whose permittivity elements are partially negative. The requirements imposed on the materials and structures to realize a PBG are derived when the frequency is above or below the cutoff frequency, and the transmission properties of the PBG are discussed by utilizing 4×4 transfer-matrix method with dispersive semiconductor metamaterial..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 431 (2010)
Optical properties of highly photosensitive hybrid sol-gel films
Jing Mao, Weidong Shen, Yi Yin, Yueguang Zhang, and Xu Liu
A new organic-inorganic hybrid material, which shows photo-induced reduction of refractive index as well as volume contraction, is prepared using a sol-gel method. This material is coated on a Si substrate by spin-coating to manufacture film. After irradiated by ultraviolet (UV) light with a deuterium lamp for 5 h, theA new organic-inorganic hybrid material, which shows photo-induced reduction of refractive index as well as volume contraction, is prepared using a sol-gel method. This material is coated on a Si substrate by spin-coating to manufacture film. After irradiated by ultraviolet (UV) light with a deuterium lamp for 5 h, the thickness of film decreases largely by 55%, and the refractive index of film changes from 1.484 to 1.445 at 550 nm. The film’s optical thickness exhibits an exponential change with the increasing irradiation time. Futhermore, the photo-patternning of the organic-inorganic hybrid film without any further process (wet etching and thermal curing) is performed utilizing the volume contraction on UV-light irradiation. This film has potential applications for fabrication of patterned filter array and apodizing filter by direct light writing, and also demonstrates good temperature stability and immunity to visible light exposure..
Chinese Optics Letters
- Publication Date: Jul. 08, 2021
- Vol. 8, Issue 4, 435 (2010)
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