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2015
Volume: 13 Issue 7
28 Article(s)
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Multiphoton Processes
Soft X-ray laser observation of femtosecond-laser-driven ablation of tungsten
Masaharu Nishikino, Noboru Hasegawa, Masahiko Ishino, Yoshihiro Ochi... and Yoshiaki Kato|Show fewer author(s)
Ablation dynamics of tungsten irradiated with a 70 fs laser pulse is investigated with X-ray interferometry and X-ray imaging using a 13.9 nm soft X-ray laser of 7 ps pulse duration. The evolution of high-density ablation front of tungsten (i.e., W) is presented. The ablation front expands to ～120 nm above the originalAblation dynamics of tungsten irradiated with a 70 fs laser pulse is investigated with X-ray interferometry and X-ray imaging using a 13.9 nm soft X-ray laser of 7 ps pulse duration. The evolution of high-density ablation front of tungsten (i.e., W) is presented. The ablation front expands to ～ 120 nm 750 m / s
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070002 (2015)
High-repetition-rate femtosecond laser micromachining of poly(methyl methacrylate)
Yiming Luo, Wei Jia, Youjian Song, Bowen Liu... and Chingyue Wang|Show fewer author(s)
Investigations are performed to explore high-repetition-rate femtosecond laser ablation effects on the physical and chemical properties of poly(methyl methacrylate) (PMMA). A scanning electron microscopy (SEM) is used to characterize the morphology change in the laser-ablated regions. The infrared and Raman spectroscopInvestigations are performed to explore high-repetition-rate femtosecond laser ablation effects on the physical and chemical properties of poly(methyl methacrylate) (PMMA). A scanning electron microscopy (SEM) is used to characterize the morphology change in the laser-ablated regions. The infrared and Raman spectroscopy reveals that the fundamental structure of the PMMA is altered after laser ablation. We demonstrate the cumulative heating is much greater during high-repetition-rate femtosecond laser ablation, supporting a photothermal depolymerization mechanism during the ablation process..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070003 (2015)
Elastic rescattering photoelectron distributions entering the relativistic regime
Sui S. Luo, Pat Grugan, Siyu Luo, and Barry C. Walker
We report photoelectron energy spectra and angular distributions for ionization with elastic scattering in ultrastrong laser fields. Noble gas species with Hartree–Fock scattering potentials show a reduction in elastic rescattering with the increasing energy of ultrastrong fields and when the Lorentz deflection of the We report photoelectron energy spectra and angular distributions for ionization with elastic scattering in ultrastrong laser fields. Noble gas species with Hartree–Fock scattering potentials show a reduction in elastic rescattering with the increasing energy of ultrastrong fields and when the Lorentz deflection of the photoelectron exceeds its wave function spread. The relativistic extension of a three-step recollision model is well-suited to the ultrastrong intensity regime (> 10 17 W / cm 2
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070004 (2015)
Behavior of the relativistic angular and energy distributions of atoms exposed to a strong and low-frequency circularly polarized laser field
Tatjana B. Miladinović, and Violeta M. Petrović
In this Letter, we focus on the theoretical analysis of the relativistic energy and angular distributions of the ejected photoelectrons during the relativistic tunnel ionization of atoms by intense, circularly polarized light. We make a small modification of the general analytical expressions for these distributions. TIn this Letter, we focus on the theoretical analysis of the relativistic energy and angular distributions of the ejected photoelectrons during the relativistic tunnel ionization of atoms by intense, circularly polarized light. We make a small modification of the general analytical expressions for these distributions. The role of the initial momentum, the ponderomotive potential, and the Stark shift are considered. We also present the maximal angle of electron emission..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070005 (2015)
Quantum-orbit theory of low-energy above-threshold ionization on and off axis
W. Becker, and D. B. Milošević
Intense-laser-induced above-threshold ionization of a bound electron into continuum states with low energy is investigated in the context of the strong-field approximation that allows for one act of rescattering of the revisiting electron. The quantum orbits for forward and backward scattering are evaluated and generalIntense-laser-induced above-threshold ionization of a bound electron into continuum states with low energy is investigated in the context of the strong-field approximation that allows for one act of rescattering of the revisiting electron. The quantum orbits for forward and backward scattering are evaluated and generalized to arbitrary scattering angles. The velocity map of the liberated electron exhibits the well-known low-energy structure as well as other features off the polarization axis..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070006 (2015)
Photoemission mechanisms of methane in intense laser fields
Huailiang Xu, Ruxin Li, and See Leang Chin
The visible and near-UV emission spectroscopy of methane (CH4) induced by a femtosecond intense laser field (800 nm, 40 fs, 1014 W/cm2) is studied. By measuring the decay profiles of the neutral fragment product CH (A2Δ→X2Π), two reaction pathways, i.e., the electron-ion recombination through e +CH4+ and the direct disThe visible and near-UV emission spectroscopy of methane (CH 4 10 14 W / cm 2 A 2 Δ → X 2 Π e + CH 4 + CH 4 + CH 4
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070007 (2015)
Turbulence-induced beam wandering during femtosecond laser filamentation
Tao Zeng, Hui Gao, Xiaodong Sun, and Weiwei Liu
The influence of air turbulence on the transverse wandering of a single femtosecond laser filament is studied by numerical simulation. The results show that the average transverse displacement of the single filament δr is proportional to the square root of turbulent structure constant and the relations between δr and tThe influence of air turbulence on the transverse wandering of a single femtosecond laser filament is studied by numerical simulation. The results show that the average transverse displacement of the single filament δ r δ r
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070008 (2015)
Temporal self-modifying characteristics of pulse propagation in multiphoton absorbers
Kun Cheng, Sujuan Zhang, Wei Li, Wanjun Dai... and Feng Jing|Show fewer author(s)
In this Letter, temporal self-modifying behavior of amplitude modulation pulse propagation characteristics in multiphoton absorbers is presented by solving the underlying theoretical model coupling the propagation equation with the rate equations. The characteristics of the output temporal shapes are of primary concernIn this Letter, temporal self-modifying behavior of amplitude modulation pulse propagation characteristics in multiphoton absorbers is presented by solving the underlying theoretical model coupling the propagation equation with the rate equations. The characteristics of the output temporal shapes are of primary concern and are discussed in detail. Amplitude modulation suppressing effects of multiphoton absorbers are numerically demonstrated; they have not been reported previously, to our knowledge. By taking a time resolved absorption coefficients, the corresponding physical mechanism is explicitly interpreted..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070009 (2015)
Multiphoton Processes
Editorial for Special Issue on Multiphoton Processes
Zhizhan Xu, and Ruxin Li
With the rapid development of ultrafast intense laser technologies, the interaction of intense laser radiation with matter has been a frontier for few decades. The International Conference on Multiphoton Processes (ICOMP), initiated in 1977, covers the latest advances in the field every three years. The special issue iWith the rapid development of ultrafast intense laser technologies, the interaction of intense laser radiation with matter has been a frontier for few decades. The International Conference on Multiphoton Processes (ICOMP), initiated in 1977, covers the latest advances in the field every three years. The special issue is based on the spirit of the 13th International Conference on Multi-Photon Processes, ICOMP13, which was held in Shanghai, organized by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, on Dec. 7-10, 2014..
Chinese Optics Letters
- Publication Date: May. 04, 2015
- Vol. 13, Issue 7, 070001 (2015)
COHERENCE OPTICS and STATISTICAL OPTICS
Three-dimensional color photon counting microscopy using Bayesian estimation with adaptive priori information
Myungjin Cho
In this Letter, we propose a novel three-dimensional (3D) color microscopy for microorganisms under photon-starved conditions using photon counting integral imaging and Bayesian estimation with adaptive priori information. In photon counting integral imaging, 3D images can be visualized using maximum likelihood estimatIn this Letter, we propose a novel three-dimensional (3D) color microscopy for microorganisms under photon-starved conditions using photon counting integral imaging and Bayesian estimation with adaptive priori information. In photon counting integral imaging, 3D images can be visualized using maximum likelihood estimation (MLE). However, since MLE does not consider a priori information of objects, the visual quality of 3D images may not be accurate. In addition, the only grayscale image can be reconstructed. Therefore, to enhance the visual quality of 3D images, we propose photon counting microscopy using maximum a posteriori with adaptive priori information. In addition, we consider a wavelength of each basic color channel to reconstruct 3D color images. To verify our proposed method, we carry out optical experiments..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070301 (2015)
Lasers and Laser Optics
Realization of a continuous frequency-tuning Ti:sapphire laser with an intracavity locked etalon
Xuejun Sun, Jiao Wei, Wenzhe Wang, and Huadong Lu
A continuous-wave all-solid-state tunable Ti:sapphire laser with compact configuration is presented. The frequency-tuning range extends from 760 to 825 nm by rotating the birefringent filters. When the intracavity etalon is locked on the oscillating frequency of the laser and the length of the resonator is scanned by tA continuous-wave all-solid-state tunable Ti:sapphire laser with compact configuration is presented. The frequency-tuning range extends from 760 to 825 nm by rotating the birefringent filters. When the intracavity etalon is locked on the oscillating frequency of the laser and the length of the resonator is scanned by the piezoelectric ceramics transducer, a maximal continuous frequency-tuning range of 15.3 GHz is realized. The obtained Ti:sapphire laser is successfully applied to scan the saturation absorption spectroscopy of D 1 Rb 87
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071401 (2015)
Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF2 crystals
Qian Zhang, Liangbi Su, Dapeng Jiang, Fengkai Ma... and Jun Xu|Show fewer author(s)
The effect of co-doping Y3+ and the doping concentration of Nd3+ on the spectroscopic properties and laser performance of Nd:CaF2 crystals are investigated systematically. For a 0.5% Nd:CaF2 crystal, the emission lifetime at 1.06 μm increases from 18 to 361 μs by co-doping 10 at.% Y3+, while the emission cross section The effect of co-doping Y 3 + Nd 3 + Nd : CaF 2 Nd : CaF 2 Y 3 + 4.27 × 10 20 cm 2 Y 3 + Nd , Y : CaF 2 Y : CaF 2 Y : CaF 2
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071402 (2015)
Diode-pumped, narrow-linewidth, linearly polarized, passively Q -switched 1645 nm Er:YAG laser
Zhenzhen Yu, Mingjian Wang, Xia Hou, and Weibiao Chen
We demonstrate a narrow-linewidth linearly polarized 1645 nm Er:YAG laser, directly diode-pumped by a fiber-coupled continuous-wave laser diode at 1532 nm. Passive Q-switching is realized by a few-layer graphene saturable absorber. A maximum polarized average output power of 3.13 W is achieved at 23.28 W incident pump We demonstrate a narrow-linewidth linearly polarized 1645 nm Er:YAG laser, directly diode-pumped by a fiber-coupled continuous-wave laser diode at 1532 nm. Passive Q
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071403 (2015)
Fast-forming focused spots through a multimode fiber based on an adaptive parallel coordinate algorithm
Zhe Yin, Guodong Liu, Fengdong Chen, and Bingguo Liu
We propose an adaptive parallel coordinate (APC) algorithm for quickly forming a series of focused spots at a multimode fiber (MMF) output by controlling the MMF input field with a spatial light modulator (SLM). Only passing over the SLM once, we can obtain SLM reflectance to form focused spots on different positions. We propose an adaptive parallel coordinate (APC) algorithm for quickly forming a series of focused spots at a multimode fiber (MMF) output by controlling the MMF input field with a spatial light modulator (SLM). Only passing over the SLM once, we can obtain SLM reflectance to form focused spots on different positions. Compared with the transmission matrix method, our APC does not require iterations and massive calculations. The APC does not require as much access device time as the adaptive sequential coordinate ascent (SCA) algorithm. The experiment results demonstrate that the time taken to form 100 spots with our APC is 1/54th the time with the SCA..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071404 (2015)
Diffraction and Gratings
Characterization of external refractive index sensitivity of a photonic crystal fiber long-period grating
Fei Tian, Jiri Kanka, and Henry Du
Long-period gratings (LPGs) are fabricated in a photonic crystal fiber (PCF) using the symmetric point-by-point CO2 laser irradiation method to explore the sensitivity characterization of PCF–LPG. Numerical simulation is used to guide the investigation. It is found that the refractive index (RI) sensitivity of PCF–LPG Long-period gratings (LPGs) are fabricated in a photonic crystal fiber (PCF) using the symmetric point-by-point CO 2
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070501 (2015)
Optical Devices
Color holographic zoom system based on a liquid lens
Di Wang, Qionghua Wang, Chuan Shen, Xin Zhou, and Chao Liu
In this Letter, we propose a color holographic zoom system based on a liquid lens. We use the spatial multiplexing method to realize color reconstruction. By controlling the focal lengths of the liquid lens and the encoded digital lens on the spatial light modulator panel, we can change the magnification of the reconstIn this Letter, we propose a color holographic zoom system based on a liquid lens. We use the spatial multiplexing method to realize color reconstruction. By controlling the focal lengths of the liquid lens and the encoded digital lens on the spatial light modulator panel, we can change the magnification of the reconstructed image very quickly, without mechanical parts and keeping the output plane stationary..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 072301 (2015)
Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems
Ruqi Zhang, Jianfeng Li, Zhitong Huang, and Yuefeng Ji
In visible light communication, orthogonal frequency division multiplexing (OFDM) is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode (LED) suppresses the transmission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlineIn visible light communication, orthogonal frequency division multiplexing (OFDM) is an effective approach to improve the system speed. However, the nonlinearity of the light-emitting diode (LED) suppresses the transmission performance. The low-frequency part of the transmitted signal from LED suffers more from nonlinearity. Therefore, a pre-equalization scheme which suppresses the low frequency part of the OFDM signal and enhances the high frequency part can decrease the impact of LED nonlinearity. The experimental results show that the bit-error rate performance is largely enhanced by the pre-compensation..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 072302 (2015)
Imaging Systems
Optimization of speckle patterns in ghost imaging via sparse constraints by mutual coherence minimization
Xuyang Xu, Enrong Li, Xia Shen, and Shensheng Han
In this Letter the problem of optimization of speckle patterns in a ghost imaging (GI) system is addressed. The mutual coherence between the measuring matrix and the sparsifying dictionary matrix is minimized to obtain the required speckle patterns. Simulation and experimental results are presented, both showing that tIn this Letter the problem of optimization of speckle patterns in a ghost imaging (GI) system is addressed. The mutual coherence between the measuring matrix and the sparsifying dictionary matrix is minimized to obtain the required speckle patterns. Simulation and experimental results are presented, both showing that the quality of the reconstructed results obtained with the optimized speckle patterns is much improved in comparison with that obtained with the general unoptimized ones. We expect this method can be used to design GI systems with high performance..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071101 (2015)
Depth map resolution improvement for 3D range-intensity correlation laser imaging
Xiaoquan Liu, Xinwei Wang, Yinan Cao, Songtao Fan... and Yuliang Liu|Show fewer author(s)
This Letter proposes a high bit-depth coding method to improve depth map resolution and render it suitable to human-eye observation in 3D range-intensity correlation laser imaging. In this method, a high bit-depth CCD camera with a nanosecond-scaled gated intensifier is used as an image sensor; subsequently two high biThis Letter proposes a high bit-depth coding method to improve depth map resolution and render it suitable to human-eye observation in 3D range-intensity correlation laser imaging. In this method, a high bit-depth CCD camera with a nanosecond-scaled gated intensifier is used as an image sensor; subsequently two high bit-depth gate images with specific range-intensity profiles are obtained to establish the gray depth map and finally the gray depth map is encoded by an equidensity pseudocolor. With this method, a color depth map is generated with higher range resolution. In our experimental work, the range resolution of the depth map is improved by a factor of 1.67..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071102 (2015)
Medical Optics and Biotechnology
Hyperspectral high-dynamic-range endoscopic mucosal imaging
Changsheng Liu, Zhimin Han, and Tianyu Xie
We develop a prototype endoscope system that can perform high-dynamic-range structure imaging and hyperspectral imaging. The system is used to successfully acquire the oxyhemoglobin spectrum of blood capillaries and obtain in vivo images of the various vascular pattern structures of the underside of the human tongue wiWe develop a prototype endoscope system that can perform high-dynamic-range structure imaging and hyperspectral imaging. The system is used to successfully acquire the oxyhemoglobin spectrum of blood capillaries and obtain in vivo images of the various vascular pattern structures of the underside of the human tongue with high intrinsic contrast and high dynamic range. The dynamic range of the acquired high-dynamic-range mucosa image is 116.5 dB, which is 68.2 dB higher than that of the mucosa images acquired by a normal low-dynamic-range CCD. Our results demonstrate the system’s tremendous potential for the clinical diagnosis of gastrointestinal diseases..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071701 (2015)
Materials
Luminescence of Tb3+/Eu3+ codoped LiYF4 single crystals under UV excitation for white-light LEDs
Yongzhang Jiang, Haiping Xia, Shuo Yang, Jiazhong Zhang... and Baojiu Chen|Show fewer author(s)
The absorption spectra, excitation spectra, and emission spectra of Tb3+/Eu3+ ions in LiYF4 single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue ～487 nm (Tb:D45→F76), yellowish green ～542 nm (Tb:D45→F75), and red ～611 nm (Eu:D05→F72) waveThe absorption spectra, excitation spectra, and emission spectra of Tb 3 + / Eu 3 + LiYF 4 ～ 487 nm Tb : D 4 5 → F 7 6 ～ 542 nm Tb : D 4 5 → F 7 5 ～ 611 nm Eu : D 0 5 → F 7 2
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071601 (2015)
Nonlinear Optics
Effect of Fe concentration on the nonlinear refraction and reverse saturable absorption in ferroelectric X-cut LiNbO3 crystal
H. L. Saadon
In this Letter, the effects of the iron (Fe) dopant concentration on the nonlinear optical properties of iron-doped ferroelectric X-cut LiNbO3 crystals plates are studied by using the Z-scan technique with a cw laser at the wavelength of 532 nm. The amount of iron in the compound is varied from 0 to 0.15 mol%. MeasuremIn this Letter, the effects of the iron (Fe) dopant concentration on the nonlinear optical properties of iron-doped ferroelectric X-cut LiNbO 3 n 2 β 10 8 cm 2 / W
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071901 (2015)
Image Processing
Femtosecond laser induced periodic large-scale surface structures on metals
Xiangming Dong, Haiying Song, and Shibing Liu
The periodic ripple structures on wolfram and titanium surfaces are induced experimentally by linear polarized femtosecond laser pulses at small incident angles. The structural features show a material difference in the s- and p-polarized laser irradiation. The interspace between the ripples increases significantly forThe periodic ripple structures on wolfram and titanium surfaces are induced experimentally by linear polarized femtosecond laser pulses at small incident angles. The structural features show a material difference in the s p p p s
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071001 (2015)
Fast reconstruction in fluorescence molecular tomography using data compression of intra- and inter-projections
Jiulou Zhang, Junwei Shi, Simin Zuo, Fei Liu... and Jianwen Luo|Show fewer author(s)
In order to improve the reconstruction accuracy in fluorescence molecular tomography (FMT), a common approach is to increase the number of fluorescence data or projections. However, this approach consumes too much memory space and computational time. In this Letter, a data compression strategy that involves the removalIn order to improve the reconstruction accuracy in fluorescence molecular tomography (FMT), a common approach is to increase the number of fluorescence data or projections. However, this approach consumes too much memory space and computational time. In this Letter, a data compression strategy that involves the removal of the redundant information from both intra- and inter-projections is proposed to reduce the dimension of the FMT inverse problem. The performance of this strategy is tested with phantom and in vivo mouse experiments. The results demonstrate that the proposed data compression strategy can accelerate the FMT reconstruction nearly tenfold and almost without any quality degradation..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 071002 (2015)
Detectors
Experimental investigation of the startup time difference between high-speed cameras
Yanyan Cao, Chao Wang, Qinwei Ma, and Shaopeng Ma
High-speed cameras are widely used in experimental research and industrial measurement. Although multiple cameras are commonly used, whether the cameras are triggered at the same time is typically overlooked. This study measures the startup time difference between two high-speed cameras employing a proposed measuring sHigh-speed cameras are widely used in experimental research and industrial measurement. Although multiple cameras are commonly used, whether the cameras are triggered at the same time is typically overlooked. This study measures the startup time difference between two high-speed cameras employing a proposed measuring system. A series of comparative experiments was conducted to consider the complex factors that can lead to a time difference. The system recorded the startup time differences for different combinations of two cameras at different frame rates, and thus acquired the dependence of the time difference on these factors. Suggestions are made on the basis of the experimental results..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 070401 (2015)
Remote Sensing and Sensors
Simultaneous 3D temperature and velocity field measurements of micro-flow with laser-induced fluorescence and micro-digital holographic particle tracking velocimetry: Numerical study
Longchao Yao, Xuecheng Wu, Jing Yang, Yingchun Wu... and Kefa Cen|Show fewer author(s)
We propose a method for simultaneous 3D temperature and velocity measurement of a micro-flow field. The 3D temperature field is characterized with two-color laser-induced fluorescence particles which are tracked with micro-digital holographic particle tracking velocimetry. A diffraction-based model is applied to analyzWe propose a method for simultaneous 3D temperature and velocity measurement of a micro-flow field. The 3D temperature field is characterized with two-color laser-induced fluorescence particles which are tracked with micro-digital holographic particle tracking velocimetry. A diffraction-based model is applied to analyze defocused particles to determine the intensity ratio of two fluorescent dyes on the particle. The model is validated with experimental images. As the result shows that the intensity ratio nearly remains unchanged with respect to depth positions, defocused particles can be used as 3D temperature sensors. Numerical work is carried out to check the method, and 3D temperature and velocity field in a 120 μm × 120 μm × 80 μm
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 072801 (2015)
Spectroscopy
Polarization spectroscopy of the 1S0-3P1 transition of mercury isotopes at 253.7 nm
Xiaohu Fu, Kangkang Liu, Ruchen Zhao, Wei Gou... and Yuzhu Wang|Show fewer author(s)
We experimentally observe polarization spectroscopy (PS) of the S01-P31 transition of mercury atom gases at 253.7 nm. The PS signal can be observed in all six richly abundant isotopes and the PS signal of six transitions for laser cooling are all clear and of a dispersive line shape. The optimized pump power and probe We experimentally observe polarization spectroscopy (PS) of the S 0 1 - P 3 1 Hg 202
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 073001 (2015)
Vision, Color, and Visual Optics
Chromaticity of white sensation for LED lighting
Qing Wang, Haisong Xu, and Jianqi Cai
In this work, a psychophysical experiment is implemented to assess the white sensation of light-emitting diode (LED) lighting in illuminant mode via a categorical judgment method by a panel of 10 observers. The visual data indicates that the higher values of white sensation estimations locate near the Planckian locus wIn this work, a psychophysical experiment is implemented to assess the white sensation of light-emitting diode (LED) lighting in illuminant mode via a categorical judgment method by a panel of 10 observers. The visual data indicates that the higher values of white sensation estimations locate near the Planckian locus within a correlated color temperature (CCT) range of 5000–9000 K. A model of white sensation for LED lighting in illuminant mode is proposed, from which the predicted maximal white sensation locates near the Planckian locus with a CCT of 6622 K, and the 95% white sensation covers a narrow two-dimensional region..
Chinese Optics Letters
- Publication Date: Jul. 10, 2015
- Vol. 13, Issue 7, 073301 (2015)
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