Journals >Chinese Optics Letters
Contents
2015
Volume: 13 Issue 11
19 Article(s)
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Atomic and Molecular Physics
Space-adjustable dark magneto-optical trap for efficient production of heteronuclear molecules
Zhujun Zhang, Zhonghua Ji, Zhonghao Li, Jinpeng Yuan, Yanting Zhao, Liantuan Xiao, and Suotang Jia
We present a simple, robust, space-adjustable dark magneto-optical trap (MOT) for the efficient production of heteronuclear molecules. Double-mixed beams made up of repumping beams and depumping beams propagate in nearly opposite directions in the dark MOT. This optical arrangement can easily adjust the spatial positioWe present a simple, robust, space-adjustable dark magneto-optical trap (MOT) for the efficient production of heteronuclear molecules. Double-mixed beams made up of repumping beams and depumping beams propagate in nearly opposite directions in the dark MOT. This optical arrangement can easily adjust the spatial positions of two clouds by changing the power ratio of the two repumping beams, and ensure a good overlap, which is very necessary for the production of heteronuclear molecules. The imaging of cold atoms by camera and the collision-induced loss rate obtained by recording the loading curve of the cold atoms show that we obtain a perfect overlap of atom clouds. The number of RbCs molecules with the double-mixed beams is improved by 70%, which is higher than the one with the single-mixed beam..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 110201 (2015)
Concave grating miniature spectrometer with an expanded spectral band by using two entrance slits
Qian Zhou, Jinchao Pang, Xinghui Li, Kai Ni, and Rui Tian
A new miniature spectrometer with two entrance slits is proposed to expand the spectral band. The proposed spectrometer is designed such that the two entrance slits share the same concave grating and detector array. The two slits are located at different positions such that the spectral range of the same light source iA new miniature spectrometer with two entrance slits is proposed to expand the spectral band. The proposed spectrometer is designed such that the two entrance slits share the same concave grating and detector array. The two slits are located at different positions such that the spectral range of the same light source incident on the detector array varies greatly between the two slits. Only one of the two slits is illuminated at a given time; as such, the two spectral ranges are sequentially measured. Theoretical calculation and experimentation are conducted to verify the proposed design..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 110501 (2015)
Bidirectional erbium-doped fiber amplifiers used in joint frequency and time transfer based on wavelength-division multiplexing technology
Qin Liu, Wei Chen, Dan Xu, Nan Cheng, Fei Yang, Youzhen Gui, Haiwen Cai, and Shensheng Han
In an experiment on the round-trip fiber transfer of joint frequency and time signals based on wavelength-division multiplexing technology, a specific bidirectional erbium-doped fiber amplifier (Bi-EDFA) with low noise and high symmetry simultaneously is designed and applied to compensate for the loss of the link. The In an experiment on the round-trip fiber transfer of joint frequency and time signals based on wavelength-division multiplexing technology, a specific bidirectional erbium-doped fiber amplifier (Bi-EDFA) with low noise and high symmetry simultaneously is designed and applied to compensate for the loss of the link. The Allan deviation (ADEV) deterioration of the 1 GHz frequency signal induced by the Bi-EDFA is only 8 × 10 15 9 × 10 18 10 4 s 1.7 × 10 14 1.2 × 10 17 10 4 s 10 3 s 7.3 × 10 14 2.5 × 10 17 10 4 s 1.
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 110601 (2015)
Adaptive digital backward propagation based on variance of intensity noise
Lin Jiang, Lianshan Yan, Zhiyu Chen, Anlin Yi, Yan Pan, Wei Pan, Bin Luo, and Guifang Li
An adaptive digital backward propagation (ADBP) algorithm is proposed and experimentally demonstrated based on the variance of the intensity noise. The proposed algorithm can self-determine the unknown nonlinear coefficient γ and the nonlinear compensation parameter ξ. Compared to the scheme based on the variance of phAn adaptive digital backward propagation (ADBP) algorithm is proposed and experimentally demonstrated based on the variance of the intensity noise. The proposed algorithm can self-determine the unknown nonlinear coefficient γ ξ
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 110602 (2015)
Full-color and less-speckled modified Gerchberg–Saxton algorithm computer-generated hologram floating in a dual-parabolic projection system
Chien-Yu Chen, Hsuan-Ting Chang, Tsung-Jan Chang, and Chih-Hao Chuang
This Letter proposes to apply full-color computer-generated holograms to the virtual image projection system so that the viewers can comfortably view floating images. Regarding the spatial division and distribution operation, a modified Gerchberg–Saxton algorithm is used for acquiring the phase infographics, which are This Letter proposes to apply full-color computer-generated holograms to the virtual image projection system so that the viewers can comfortably view floating images. Regarding the spatial division and distribution operation, a modified Gerchberg–Saxton algorithm is used for acquiring the phase infographics, which are input into the spatial light modulator for the reconstructed projection. Such a virtual image projection system could reach the vertical angle of view of 15°–75° and the horizontal angle of view 360°, and the mixed-light modulating proportion contains a 3 mW red light laser, a 2 mW green light laser, and a 2.6 mW blue light laser to achieve the full-color mixed-light proportion with a speckle contrast of 6.65%. The relative diffraction efficiency and root mean square error of the reconstructed image are 95.3% and 0.0524, respectively..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 110901 (2015)
Optical design for Antarctic Bright Star Survey Telescope
Zhengyang Li, Haipin Lu, and Xiangyan Yuan
The exoplanet search is one of the most exciting research fields in astrophysics. The Antarctic Bright Star Survey Telescope (BSST), capable of continuous exoplanet observation on polar nights, is a Ritchey–Chretien telescope with a three-lens field corrector, and has a 300 mm aperture, 2.76 focal ratio, and a wavelengThe exoplanet search is one of the most exciting research fields in astrophysics. The Antarctic Bright Star Survey Telescope (BSST), capable of continuous exoplanet observation on polar nights, is a Ritchey–Chretien telescope with a three-lens field corrector, and has a 300 mm aperture, 2.76 focal ratio, and a wavelength coverage ranging from 0.36 to 1.014 μm. Equipped with a 4 k × 4 k 12 μm / pixel
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111101 (2015)
Hollow-waveguide-based carbon dioxide sensor for capnography
Bo Xiong, Zhenhui Du, Lin Liu, Zheyuan Zhang, Jinyi Li, and Qiling Cai
A CO2 sensor for capnography, based on a hollow waveguide (HWG) and tunable diode laser absorption spectroscopy (TDLAS), is presented; the sensor uses direct absorption spectroscopy and requires neither frequent calibration nor optical filters, giving it a significant advantage over existing techniques. Because of the A CO 2 CO 2 CO 2
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111201 (2015)
Compact, integrated PLZT optical switch array
Guohua Hu, Zhipeng Qi, Binfeng Yun, Ruohu Zhang, and Yiping Cui
Due to the excellent electro-optic properties of lead lanthanum zirconium titanate ((Pb,La)(Zr,Ti)O3, PLZT), compact 1×2 and 1×4 PLZT optical switches with a high response speed are proposed and fabricated successfully in this Letter. By introducing a thin isolating layer between the waveguides and the electrDue to the excellent electro-optic properties of lead lanthanum zirconium titanate (( Pb , La ) ( Zr , Ti ) O 3 1 × 2 1 × 4 1 × 2 1 × 2 20.5 dB 1 × 4 20.5 dB 15 mm × 6 mm
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111301 (2015)
Highly sensitive and homogeneous SERS substrate fabricated by a femtosecond laser combined with dewetting
Xudong Tan, Lan Jiang, Jie Hu, Pengjun Liu, Andong Wang, and Yong Lu
We report a simple, cost-effective and repeatable method for fabricating a large area and uniform substrate for surface-enhanced Raman scattering (SERS). The silicon, micromachined by a femtosecond laser, is coated with gold film and then treated through the dewetting process. The morphology shows a higher electric fieWe report a simple, cost-effective and repeatable method for fabricating a large area and uniform substrate for surface-enhanced Raman scattering (SERS). The silicon, micromachined by a femtosecond laser, is coated with gold film and then treated through the dewetting process. The morphology shows a higher electric field enhancement due to light trapping. The enhancement factor of the SERS substrate is 9.2 × 10 7
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111401 (2015)
Nanosecond high-pulse energy 1.57 μm KTA optical parametric amplifier with time delay
Huanhuan Li, Xiaolei Zhu, Xiuhuan Ma, Shiguang Li, and Weibiao Chen
An efficient two-stage KTiOAO4 optical parametric amplifier (OPA) system with walk-off-compensating alignment is designed. By introducing an extra time delay between the pump pulse and the signal pulse, this OPA architecture is capable of obtaining high optical conversion efficiency and high signal gain simultaneously.An efficient two-stage KTiOAO 4 M 2
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111402 (2015)
Diode-pumped tunable single-longitudinal-mode Tm, Ho:YAG twisted-mode laser
Youlun Ju, Wei Liu, Baoquan Yao, Tongyu Dai, Jing Wu, Jinhe Yuan, Ji Wang, Xiaoming Duan, and Yuezhu Wang
A diode-end-pumped tunable twisted-mode cavity Tm, Ho:YAG laser with single-longitudinal-mode (SLM) operation is demonstrated in this Letter. The maximal SLM output power is 106 mW with a slope efficiency of 4.86%. The wavelength can be changed from 2090.38 to 2097.32 nm by tuning the angle of an etalon.A diode-end-pumped tunable twisted-mode cavity Tm, Ho:YAG laser with single-longitudinal-mode (SLM) operation is demonstrated in this Letter. The maximal SLM output power is 106 mW with a slope efficiency of 4.86%. The wavelength can be changed from 2090.38 to 2097.32 nm by tuning the angle of an etalon..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111403 (2015)
Stable seeder-injected Nd:YAG pulsed laser using a RbTiOPO4 phase modulator
Junxuan Zhang, Xiaolei Zhu, Xiuhua Ma, Huaguo Zang, Shiguang Li, Suyong Yin, and Weibiao Chen
A stable, single-longitudinal-mode, nanosecond-pulsed Nd:YAG laser with a laser-diode dual-end pumping arrangement is constructed. Injection seeding is performed successfully by utilizing a RbTiOPO4 crystal as the intracavity phase modulator to change the optical length of the slave cavity based on the delay-ramp-fire A stable, single-longitudinal-mode, nanosecond-pulsed Nd:YAG laser with a laser-diode dual-end pumping arrangement is constructed. Injection seeding is performed successfully by utilizing a Rb TiOPO 4 M 2
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111404 (2015)
Frequency difference lock-in phenomenon’s weakening by transverse magnetic field in Y-shaped cavity dual-frequency laser
Guangzong Xiao, Bin Zhang, Zhiguo Wang, Yangying Fu, and Mengfan Gong
We report experimental progress in weakening the frequency difference lock-in phenomenon in a Y-shaped cavity dual-frequency laser. A cube coil pair is chosen to provide a uniform magnetic field for tunability and uniformity of magnetic field strength. When the transverse magnetic field intensity is 9 mT, the frequencyWe report experimental progress in weakening the frequency difference lock-in phenomenon in a Y-shaped cavity dual-frequency laser. A cube coil pair is chosen to provide a uniform magnetic field for tunability and uniformity of magnetic field strength. When the transverse magnetic field intensity is 9 mT, the frequency difference lock-in phenomenon is evidently weakened and the frequency difference can be continuously tuned in the range of 0.12 MHz to 1.15 GHz. Moreover, the relationship between the minimal frequency difference and magnetic field intensity are investigated and discussed. Then a Y-shaped cavity dual-frequency laser is expected to be utilized as an optimum light source for heterodyne interferometric sensing and precise laser measurement..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111405 (2015)
Sideband-controllable soliton pulse with bismuth-based erbium-doped fiber
S. J. Tan, Z. C. Tiu, S. W. Harun, and H. Ahmad
A sideband-controllable soliton mode-locked erbium-doped fiber laser is successfully demonstrated utilizing the nonlinear polarization rotation technique. The sidebands can be produced or suppressed by performing simple polarization light tuning with a polarization controller. It is believed that the elimination of theA sideband-controllable soliton mode-locked erbium-doped fiber laser is successfully demonstrated utilizing the nonlinear polarization rotation technique. The sidebands can be produced or suppressed by performing simple polarization light tuning with a polarization controller. It is believed that the elimination of the sidebands is due to the dispersive waves that are filtered out by the polarization-dependent isolator in the resonator. With the elimination of the Kelly sidebands, the obtained 3 dB bandwidth is 10.6 nm and the attainable pulse duration is 0.86 ps. In this experiment, it is proven that the existence of Kelly sidebands limits the attainable pulse duration..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111406 (2015)
Optical Devices
Imaging of nerve injury with HSP27 antibody-functionalized photoacoustic nanoprobes
Hongjiang Chen, Zhongjiang Chen, Jankun Xu, and Jun Hu
Early detection and timely treatment of nerve injury is crucial for the repair of nerve function. One week following a crush injury, heat shock protein 27 (HSP27) is over-expressed along the entire length of the sciatic nerve. Herein, we present an approach to detect injured nerves by photoacoustic microscopy after labEarly detection and timely treatment of nerve injury is crucial for the repair of nerve function. One week following a crush injury, heat shock protein 27 (HSP27) is over-expressed along the entire length of the sciatic nerve. Herein, we present an approach to detect injured nerves by photoacoustic microscopy after labeling the injured nerve with HSP27 antibody-conjugated gold nanoparticles. The studies reveal that nanoprobe administration enabled the detection of injured nerves by photoacoustic microscopy, especially during the early stages within 3–7 days post injury. In conclusion, photoacoustic microscopy combined with antibody-conjugated nanoparticles holds potential for the early detection of nerve injury..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111701 (2015)
In vivo imaging of mice auricle vessels using adaptive optical confocal fluorescence microscope
Yi He, Zhibin Wang, Yuanyuan Wang, Ling Wei, Xiqi Li, Jinsheng Yang, Guohua Shi, and Yudong Zhang
Facilitated with stochastic parallel gradient descent (SPGD) algorithm for wavefront sensorless correcting aberrations, an adaptive optics (AO) confocal fluorescence microscopy is developed and used to record fluorescent signals in vivo. Vessels of mice auricle at 80, 100 and 120 μm depth are obtained, and image contraFacilitated with stochastic parallel gradient descent (SPGD) algorithm for wavefront sensorless correcting aberrations, an adaptive optics (AO) confocal fluorescence microscopy is developed and used to record fluorescent signals in vivo . Vessels of mice auricle at 80, 100 and 120 μm depth are obtained, and image contrast and fluorescence intensity are significantly improved with AO correction. The typical 10%–90% rise-time of the metric value measured is 5.0 s for a measured close-loop bandwidth of 0.2 Hz. Therefore, the AO confocal microscopy implemented with SPGD algorithm for robust AO corrections will be a powerful tool for study of vascular dynamics in future..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 111702 (2015)
Determination of the focused beam waist of lasers with weak measurements
Linguo Xie, Xiaodong Qiu, Jiangdong Qiu, Zhiyou Zhang, Jinglei Du, and Fuhua Gao
In this Letter, a method for detecting the focused beam waist of lasers is proposed by using weak measurements based on the so-called weak-value amplification. We establish a propagation model to describe the quantitative relation between the beam waist and the amplified shift of the spin Hall effect of light (SHEL), wIn this Letter, a method for detecting the focused beam waist of lasers is proposed by using weak measurements based on the so-called weak-value amplification. We establish a propagation model to describe the quantitative relation between the beam waist and the amplified shift of the spin Hall effect of light (SHEL), which is sensitive to the variation of the beam waist. We experimentally measure the amplified shift corresponding to a different beam waist and the experimental data agrees well with theoretical calculation. These results confirm the rationality and feasibility of our method..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 112401 (2015)
Spectral properties of entangled photon pairs generated via quasi-phased-matched spontaneous parametric down-conversion
Maopeng Xia, Jianjun Li, Youbo Hu, Wenyang Sheng, Dongyang Gao, Weiwei Pang, and Xiaobing Zheng
The spectral properties of entangled photon pairs generated via quasi-phased matching in spontaneous parametric down-conversion are proposed and demonstrated experimentally. A general mathematical model for evaluating the spectral properties is developed to obtain the spectrum shape and range of down-converted photons.The spectral properties of entangled photon pairs generated via quasi-phased matching in spontaneous parametric down-conversion are proposed and demonstrated experimentally. A general mathematical model for evaluating the spectral properties is developed to obtain the spectrum shape and range of down-converted photons. The model takes into account the effects of phase mismatching due to non-ideal pumping and the relationship between crystal periodic modulation function and the incidence angle of the pump beam. The spectrum curve shape is determined by the discrete Fourier transform of a Gaussian pump beam and the integration of parametric down-conversion generated by an individual plane wave. An experiment is carried out with a PPLN non-linear crystal and dispersing optics, which shows a good consistency in their spectral ranges and shapes with our model predictions within the spectrum of 600–633 nm. This therefore illustrates that both the simulation model and the experimental process are reasonable. This novel method has potential applications in high-accuracy calibration in the wide spectrum using correlated photons..
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 113001 (2015)
Long plasma channels and high-voltage discharges induced by strong picosecond laser pulses
Hua Yang, Xiaosong Tang, Xingwei Zhang, Li Zhang, Fuli Tan, Jianheng Zhao, and Chengwei Sun
The formation of long plasma channels and laser-induced high-voltage discharges are demonstrated by focusing infrared picosecond laser pulses in air. Based on measurements of the channel conductivity, the maximum electron density in excess of 1014 cm 3 is estimated. The plasma channels are good conductors, through whicThe formation of long plasma channels and laser-induced high-voltage discharges are demonstrated by focusing infrared picosecond laser pulses in air. Based on measurements of the channel conductivity, the maximum electron density in excess of 10 14 cm 3
Chinese Optics Letters
- Publication Date: Nov. 10, 2015
- Vol. 13, Issue 11, 113201 (2015)
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