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2015
Volume: 13 Issue 5
20 Article(s)
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Atomic and Molecular Physics
Ultrafast gain dynamics in
Kaixuan Zhai, Ziting Li, Hongqiang Xie, Chenrui Jing... and Ya Cheng|Show fewer author(s)
We experimentally demonstrate N2+ lasing actions at the wavelengths of 353.3, 353.8, and 354.9 nm using a circularly polarized femtosecond laser. The three laser lines correspond to the B2Σu+(v′=5,4,3)→X2Σg+(v=4,3,2) transitions, respectively. Particularly, we reveal the pressure-dependent gain dynamics of these lasingWe experimentally demonstrate N 2 + B 2 Σ u + ( v ′ = 5,4 , 3 ) → X 2 Σ g + ( v = 4 , 3 , 2 ) N 2 +
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050201 (2015)
Selection of odd or even harmonics by a multi-color laser field with macroscopic phase-matching
Jiaming Jiang, Pengfei Wei, Zhinan Zeng, Xiaolong Yuan... and Zhizhan Xu|Show fewer author(s)
We experimentally and theoretically demonstrate that the property (odd or even) of generated harmonics can be selected by manipulating the macroscopic phase-matching conditions based on a three-color laser field. Only odd or even harmonics can be made dominant by changing the focal position and adjusting the gas pressuWe experimentally and theoretically demonstrate that the property (odd or even) of generated harmonics can be selected by manipulating the macroscopic phase-matching conditions based on a three-color laser field. Only odd or even harmonics can be made dominant by changing the focal position and adjusting the gas pressure. These results indicate that the odd-even property of the generated harmonics can be controlled by using the multi-color laser field with macroscopic phase-matching..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050202 (2015)
Instrumentation, Measurement, and Metrology
Novel calibration optical path of cryogenic radiometer
Weiwei Pang, Xiaobing Zheng, Jianjun Li, Xueshun Shi... and Qing Kang|Show fewer author(s)
We introduce a novel calibration optical path of the cryogenic radiometer, which can avoid the repeated dismounting measurement and eliminate the negative influence of Brewster window effect on calibration result. The novel calibration optical path is used to calibrate the absolute spectral responsivity of the standardWe introduce a novel calibration optical path of the cryogenic radiometer, which can avoid the repeated dismounting measurement and eliminate the negative influence of Brewster window effect on calibration result. The novel calibration optical path is used to calibrate the absolute spectral responsivity of the standard transfer detector at 633 nm, the results of which are compared with the ones of the previous structure. It is shown that comparing the previous results to the structure optimization, the measurement uncertainty of laser power reduces by a factor of 2, the measurement uncertainty on the absolute spectral responsivity of the transfer detector decreases by 15%, and the consistence of the calibration on absolute spectral responsivity is 4.0 × 10 3
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051201 (2015)
Lasers and Laser Optics
Modulated bandwidth enhancement in an amplified feedback laser
Liqiang Yu, Lu Guo, Dan Lu, Chen Ji... and Lingjuan Zhao|Show fewer author(s)
We report a direct, modulated bandwidth enhancement in a amplified feedback laser (AFL), both experimentally and numerically. By means of fabricated devices, an enhanced 3 dB bandwidth of 27 GHz with an in-band flatness of ±3 dB is experimentally confirmed at 13 °C. It is numerically confirmed that the modulaWe report a direct, modulated bandwidth enhancement in a amplified feedback laser (AFL), both experimentally and numerically. By means of fabricated devices, an enhanced 3 dB ± 3 dB
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051401 (2015)
High power red laser generation by second harmonic generation with GTR-KTP crystal
Baitao Zhang, Jian Ning, Zhaowei Wang, Kezhen Han, and Jingliang He
In this Letter, a gray-tracking-resistant—potassium titanyl phosphate (GTR-KTP) crystal is used for intracavity frequency doubling red laser generation for the first time. Under the 808 nm LD pump power of 180 W, as high as 12.5 W of red laser output is obtained with the optimum repetition rate of 7 kHz. Within the redIn this Letter, a gray-tracking-resistant—potassium titanyl phosphate (GTR-KTP) crystal is used for intracavity frequency doubling red laser generation for the first time. Under the 808 nm LD pump power of 180 W, as high as 12.5 W of red laser output is obtained with the optimum repetition rate of 7 kHz. Within the red laser power variation range between the maximum to 70%, a temperature tolerance is measured to be 35°C. The results prove that GTR-KTP should be a potential nonlinear crystal for red laser generation..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051402 (2015)
Resonant ablation rules of femtosecond laser on Pr–Nd doped silicate glass
Zhi Luo, Ji’an Duan, Cong Wang, Xiaoyan Sun, and Kai Yin
Resonant effect is found in femtosecond laser ablating Pr–Nd glass. When processed with resonant wavelength of 807 nm, resonant ablation efficiency (RAE) with a single pulse can be improved by 45.22%. Furthermore, RAE closely relates to laser intensity. For resonant ablation, RAE is increased significantly when laser iResonant effect is found in femtosecond laser ablating Pr–Nd glass. When processed with resonant wavelength of 807 nm, resonant ablation efficiency (RAE) with a single pulse can be improved by 45.22%. Furthermore, RAE closely relates to laser intensity. For resonant ablation, RAE is increased significantly when laser intensity < 0.556 × 10 14 W / cm 2 > 0.556 × 10 14 W / cm 2
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051403 (2015)
Fabrication and properties of tape-casting transparent Ho:Y3Al5O12 ceramic
Wenchao Wang, Fei Tang, Xuanyi Yuan, Chaoyang Ma... and Yongge Cao|Show fewer author(s)
High-quality holmium-doped Y3Al5O12 (YAG) ceramic is fabricated in sequence by tape-casting and vacuum sintering. The average grain size of the Ho:YAG ceramic is around 20 μm with a fully dense microstructure. The inline transmittance of the sample is ～82% in visible and IR region. The fluorescence lifetime at 2088 nm High-quality holmium-doped Y 3 Al 5 O 12 ～ 82 %
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051404 (2015)
Diffraction and Gratings
Design of two-dimensional apodized grating couplers with Gaussian diffractive mode
Hua Wu, Chong Li, Qiaoli Liu, Bai Liu... and Xia Guo|Show fewer author(s)
Two-dimensional apodized grating couplers are proposed with grating grooves realized by a series of nano-rectangles, with the feasibility of digital tailoring the equivalent refractive index of each groove in order to obtain the Gaussian output diffractive mode in order to enhance the coupling efficiency to the opticalTwo-dimensional apodized grating couplers are proposed with grating grooves realized by a series of nano-rectangles, with the feasibility of digital tailoring the equivalent refractive index of each groove in order to obtain the Gaussian output diffractive mode in order to enhance the coupling efficiency to the optical fiber. According to the requirement of leakage factor distribution for a Gaussian output profile, the corresponding effective refractive index of the grating groove, duty cycle, and period are designed according to the equivalent medium theory. The peak coupling efficiency of 93.1% at 1550 nm and 3 dB bandwidth of 82 nm are achieved..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050501 (2015)
Fiber Optics and Optical Communications
Tunable negative coefficient microwave photonic filter based on a polarization modulator and a polarization beam interferometer
Yanbing Jin, Erwin H. W. Chan, Xinhuan Feng, Xudong Wang, and Bai-ou Guan
A new tunable microwave photonic notch filter with negative coefficients is presented. It is based on a polarization modulator and a polarization beam interferometer. Experimental results are presented that embody the new concept.A new tunable microwave photonic notch filter with negative coefficients is presented. It is based on a polarization modulator and a polarization beam interferometer. Experimental results are presented that embody the new concept..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050601 (2015)
Magnetostrictive composite material-based polarimetric heterodyning fiber-grating laser miniature magnetic field sensor
Wei He, Linghao Cheng, Qiang Yuan, Yizhi Liang... and Bai-Ou Guan|Show fewer author(s)
A novel fiber-optic magnetic field sensor is demonstrated based on a dual-polarization fiber-grating laser, which is embedded in an epoxy resin-bonded magnetostrictive composite material with doped Terfenol-D particles. A simple structure is designed to convert the magnetic field-induced strain to transversal stress, wA novel fiber-optic magnetic field sensor is demonstrated based on a dual-polarization fiber-grating laser, which is embedded in an epoxy resin-bonded magnetostrictive composite material with doped Terfenol-D particles. A simple structure is designed to convert the magnetic field-induced strain to transversal stress, which is applied to the fiber laser to produce beat note frequency changes for measurement purposes. The response of the proposed sensor is measured, and shows quite a good directivity and linearity with a sensitivity of 10.5 Hz/μT to the magnetic field. It also shows a large measurable range up to about 0.3 T..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050602 (2015)
Hybrid fiber interferometer for simultaneous measurement of displacement and temperature
Fei Meng, Zhongbao Qin, Qiangzhou Rong, Hao Sun... and Honggao Geng|Show fewer author(s)
A hybrid fiber interferometer sensing configuration for displacement and temperature measurements is proposed and experimentally demonstrated that is constructed by splicing a short section of polarization maintaining optical fiber to an end-cleaved single mode optical fiber with a tapering structure. The reflected speA hybrid fiber interferometer sensing configuration for displacement and temperature measurements is proposed and experimentally demonstrated that is constructed by splicing a short section of polarization maintaining optical fiber to an end-cleaved single mode optical fiber with a tapering structure. The reflected spectrum changes with the variation of displacement and temperature. The sensing configuration uses the method of wavelength and intensity modulations for displacement and temperature measurements, respectively, to which the sensitivities are 0.01392 nm/μm, 0.0214 dBm/μm, 0.09136 nm / ° C
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 050603 (2015)
Imaging Systems
3D image reconstruction with a controllable overlapping number of elemental images in computational integral imaging
Myungjin Cho, and Donghak Shin
In this Letter, we propose a three-dimensional (3D) image reconstruction method with a controllable overlapping number of elemental images in computational integral imaging. The proposed method can control the overlapping number of pixels coming from the elemental images by using the subpixel distance based on ray optiIn this Letter, we propose a three-dimensional (3D) image reconstruction method with a controllable overlapping number of elemental images in computational integral imaging. The proposed method can control the overlapping number of pixels coming from the elemental images by using the subpixel distance based on ray optics between a 3D object and an image sensor. The use of a controllable overlapping number enables us to provide an improved 3D image visualization by controlling the inter-pixel interference within the reconstructed pixels. To find the optimal overlapping number, we simulate the pickup and reconstruction processes and utilize the numerical reconstruction results using a peak signal-to-noise ratio (PSNR) metric. To demonstrate the feasibility of our work in optical experiments, we carry out the preliminary experiments and present the results..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051101 (2015)
Medical Optics and Biotechnology
Fluorochrome-labeled monoclonal antibody with characteristic M-shaped spectral peak for optical imaging: Dual-labeling versus mixture of fluorochromes
Jan Menke, Thomas Kruewel, and Christian Dullin
In this work two different fluorochromes (Alexa 594 and Alexa 680) are conjugated to the same monoclonal antibody (Cetuximab) for obtaining a characteristic M-shaped dual-peak spectrum. Dual-labeling of Cetuximab by mixing both fluorochromes before the conjugation step gives spectral results similar to those of mixing In this work two different fluorochromes (Alexa 594 and Alexa 680) are conjugated to the same monoclonal antibody (Cetuximab) for obtaining a characteristic M-shaped dual-peak spectrum. Dual-labeling of Cetuximab by mixing both fluorochromes before the conjugation step gives spectral results similar to those of mixing of fluorochrome-labeled Cetuximab after the conjugation step ( P > 0.05 )
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051701 (2015)
Materials
Actively tunable metamaterial resonators based on colossal magnetoresistance in the infrared regime
Cheng Wang, Changchun Yan, Jiebing Tian, Ying Han... and Daohua Zhang|Show fewer author(s)
We present a tunable resonator consisting of a colossal magnetoresistant cross in which a smaller gold cross is embedded. Simulations show the resonance frequencies of the resonator move into the infrared regime when there is a change in the intensity of the external magnetic field applied to the resonator. The source We present a tunable resonator consisting of a colossal magnetoresistant cross in which a smaller gold cross is embedded. Simulations show the resonance frequencies of the resonator move into the infrared regime when there is a change in the intensity of the external magnetic field applied to the resonator. The source of the tunability is the variance in the colossal magnetoresistance in the resonator when the intensity of the magnetic field changes, which accordingly leads to a shift in the resonance frequency. Such a method offers a new way to achieve tunability, which has potential applications in controllable photoelectric elements..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051601 (2015)
Spectral properties and laser performance of Nd:Lu3Al5O12 ceramic
Shuqi Qiao, Yang Zhang, Xiangchun Shi, Benxue Jiang... and Luo Gui|Show fewer author(s)
In this work, the absorption, fluorescence spectra, and fluorescence decay curve of Nd:Lu3Al5O12, i.e., neodymium lutetium aluminum garnet (Nd:LuAG) ceramic are investigated. A diode-end-pumped Nd:LuAG ceramic laser is demonstrated for the first time (to our knowledge). We present the experiment results of Nd:LuAG ceraIn this work, the absorption, fluorescence spectra, and fluorescence decay curve of Nd : Lu 3 Al 5 O 12
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051602 (2015)
Structure and up-conversion luminescence of Pr3+/Yb3+ co-doped CaNb2O6 thin films by pulsed laser deposition
Yinzhen Wang, Pingping Duan, Ning Li, Juqing Di... and Qinyu He|Show fewer author(s)
Pr3+/Yb3+ co-doped CaNb2O6 thin films are deposited on Si(100) substrates by pulsed laser deposition and annealed at different temperatures in air atmosphere. X-ray diffraction, Raman spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectra are used to characterize the sampPr 3 + / Yb 3 + CaNb 2 O 6 Pr 3 + / Yb 3 + CaNb 2 O 6
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051603 (2015)
OPTICAL DATA STORAGE
Super-long longitudinal magnetization needle generated by focusing an azimuthally polarized and phase-modulated beam
Wangzi Ma, Dawei Zhang, Linwei Zhu, and Jiannong Chen
Based on the inverse Faraday effect, a super-long longitudinal magnetization needle can be induced by a transversely polarized needle-shaped electric field. This needle-shaped electric field can be obtained in the focal volume of the objective by focusing an azimuthally polarized vortex beam that is modulated both radiBased on the inverse Faraday effect, a super-long longitudinal magnetization needle can be induced by a transversely polarized needle-shaped electric field. This needle-shaped electric field can be obtained in the focal volume of the objective by focusing an azimuthally polarized vortex beam that is modulated both radially and azimuthally by a specifically designed annular phase filter. The numerical calculation shows that the full widths at half-maximums in longitudinal direction and in transverse direction of the magnetization needle are 28 λ 0.27 λ
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 052101 (2015)
Image Processing
Performance analysis of space-shift keying over negative-exponential and log-normal FSO channels
Mohamed Abaza, Raed Mesleh, Ali Mansour, and el-Hadi Aggoune
The average bit-error rate (ABER) performance of free-space optical (FSO) communication links is investigated for space-shift keying (SSK) over log-normal and negative-exponential atmospheric turbulence channels. SSK is compared with repetition codes and a single-input single-output system using multiple pulse amplitudThe average bit-error rate (ABER) performance of free-space optical (FSO) communication links is investigated for space-shift keying (SSK) over log-normal and negative-exponential atmospheric turbulence channels. SSK is compared with repetition codes and a single-input single-output system using multiple pulse amplitude modulations. Simulation results show that the signal-to-noise ratio gain of SSK largely increases with greater spectral efficiencies and/or higher turbulence effects. A tight bound for ABER is derived based on an exact moment generation function (MGF) for negative-exponential channel and an approximate MGF for log-normal channel. Finally, extensive Monte Carlo simulations are run to validate the analytical analysis..
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051001 (2015)
Integrated Optics
Compact grating displacement measurement system with a 3 × 3 coupler
Chunhua Wei, Shuhua Yan, Cunbao Lin, Zhiguang Du, and Guochao Wang
We present a compact displacement measurement system possessing the capability of nanometer-scale precision. On basis of integrating single grating with 3×3 coupler for phase shift in interference signal, the present scheme features advantages of simple structure, convenient alignment, and insensitivity to air turWe present a compact displacement measurement system possessing the capability of nanometer-scale precision. On basis of integrating single grating with 3 × 3
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 051301 (2015)
Optics at Surfaces
Variation of coating transmission under intense laser irradiation
Zhiwu Zhu, Feng Shi, Xiangai Cheng, Chao Shen... and Ye Tian|Show fewer author(s)
A model that considers both thermal expansion and thermo-optical effects is developed to investigate the transmission variation of optical coatings when they are exposed to an intense laser beam. Our results indicate that a higher gradient of the transmission spectrum curve at a certain wavelength leads to a more evideA model that considers both thermal expansion and thermo-optical effects is developed to investigate the transmission variation of optical coatings when they are exposed to an intense laser beam. Our results indicate that a higher gradient of the transmission spectrum curve at a certain wavelength leads to a more evident variation of the coating transmission. Three customized HfO 2 – SiO 2
Chinese Optics Letters
- Publication Date: May. 10, 2015
- Vol. 13, Issue 5, 052401 (2015)
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