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Contents
2015
Volume: 13 Issue 2
19 Article(s)
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Atomic and Molecular Physics
Non-resonant magneto-optical effects in cold atoms
Jinyin Wan, Huadong Cheng, Yanling Meng, Ling Xiao... and Liang Liu|Show fewer author(s)
We report a novel nonresonant magneto-optical effect in cold atoms and present the optimized parameters of the biased magnetic field, the incident probe light intensity, and the probe detuning to obtain the maximal signal of the magneto-optical rotation. This detection scheme may further improve the stability of the coWe report a novel nonresonant magneto-optical effect in cold atoms and present the optimized parameters of the biased magnetic field, the incident probe light intensity, and the probe detuning to obtain the maximal signal of the magneto-optical rotation. This detection scheme may further improve the stability of the cold atom clock..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020201 (2015)
Geometric Optics
Optical design for an LED-based handheld underwater wireless optical communication system
Chen Chen, Xiaohui Zhang, and Jionghui Rao
We propose an LED reshaping lens design for a handheld underwater wireless optical system to solve the problem of targeting the receiver. The simulation results shows that the designed lens can achieve 0.91 light intensity uniformity and 91.39% optical efficiency in hemisphere space, even with the actual LED model. AftWe propose an LED reshaping lens design for a handheld underwater wireless optical system to solve the problem of targeting the receiver. The simulation results shows that the designed lens can achieve 0.91 light intensity uniformity and 91.39% optical efficiency in hemisphere space, even with the actual LED model. After fabrication with computer numeric control, the work demonstrates the design to be effective..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020801 (2015)
Holography
Visualized measurement of the electric field in large aperture LiNbO3 crystal by digital holographic interferometry
Zhiyong Lu, Jianfeng Sun, Yu Zhou, Ning Zhang... and Liren Liu|Show fewer author(s)
The electric field distribution in LiNbO3 crystal under different electrode shape is presented by using the digital holographic interferometry. Three configurations of phase modulator including the rectangular electrode type, single-triangle electrode type, and dual-triangle electrode type are performed in this experimThe electric field distribution in LiNbO 3 in situ quantitative analysis of electric field distribution is a key to optimizing electrode shape..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020901 (2015)
Lasers and Laser Optics
Highly efficient reduced graphene oxide mode-locked Nd:GGG laser
Chunhua Zuo, Jia Hou, Baitao Zhang, and Jingliang He
We report, for the first time to our knowledge, a diode-end-pumped passively mode-locked (ML) Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide (RGO) saturable absorber mirror. The ML laser gives a pulse duration of 15.1 ps under the maximum average output power of 1.44 W, correspondWe report, for the first time to our knowledge, a diode-end-pumped passively mode-locked (ML) Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide (RGO) saturable absorber mirror. The ML laser gives a pulse duration of 15.1 ps under the maximum average output power of 1.44 W, corresponding to a slope efficiency of 21.1%. The single-pulse energy and peak power are 21.6 nJ and 1.43 kW, respectively. The results indicate that our RGO saturable absorber has promising prospects for applications in high-power and high-efficiency ultrafast lasers..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021401 (2015)
Electro-optically Q -switched 946 nm laser of a composite Nd:YAG crystal
Jing Huang, Xiuhan Hu, and Weibiao Chen
A depolarization phenomenon in an electro-optical crystal in a quasi-three-level 946 nm Nd:YAG laser is observed. A compensation of the thermal effects in electro-optical crystals is achieved by employing a quarter-wave plate, with one optical axis parallel to the laser polarization. This technique allows for the produA depolarization phenomenon in an electro-optical crystal in a quasi-three-level 946 nm Nd:YAG laser is observed. A compensation of the thermal effects in electro-optical crystals is achieved by employing a quarter-wave plate, with one optical axis parallel to the laser polarization. This technique allows for the production of an electro-optically Q ～ 32 kW
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021402 (2015)
High-peak-power passively Q -switched 1.3 μm Nd:YAG/V3+:YAG laser pumped by a pulsed laser diode
Zhaowei Wang, Baitao Zhang, Jian Ning, Xiaotong Zhang... and Ruwei Zhao|Show fewer author(s)
We demonstrate a high-pulse-energy, short-pulse-width passively Q-switched (PQS) Nd:YAG/V3+:YAG laser at 1.3 μm, which is end-pumped by a pulsed laser diode. During the PQS regime, a maximum total output pulse energy of 3.3 mJ is obtained under an absorbed pump pulse energy of 21.9 mJ. Up to 400 μJ single-pulse energy We demonstrate a high-pulse-energy, short-pulse-width passively Q Nd : YAG / V 3 + : YAG
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021403 (2015)
Efficient multi-wavelength lasers made of Nd:GdLuAG crystal
Yongguang Zhao, Zhengping Wang, Haohai Yu, Xiaodong Xu... and Xinguang Xu|Show fewer author(s)
Owing to the small differences between the cross-sections of the four emission peaks around 1.3 μm, an efficient four-wavelength synchronous launched laser is demonstrated using a Nd:GdLuAG crystal. The laser has no special resonator design. The maximum output power is 4.28 W, which corresponds to a conversion efficienOwing to the small differences between the cross-sections of the four emission peaks around 1.3 μm, an efficient four-wavelength synchronous launched laser is demonstrated using a Nd:GdLuAG crystal. The laser has no special resonator design. The maximum output power is 4.28 W, which corresponds to a conversion efficiency of 45.6%. For the Q ～ 80 μJ Q
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021404 (2015)
Adjustable unbalanced quantum random-number generator
Manli Xu, Jingzheng Huang, Wenye Liang, Chunmei Zhang... and Zhengfu Han|Show fewer author(s)
We report an adjustable unbalanced quantum random-number generator based on the polarization of photons, which can produce nondeterministic true random unbalanced numbers. The underlying physical process is inherently quantum mechanical. To prove the quality of the output sequence of the proposed generator, we test theWe report an adjustable unbalanced quantum random-number generator based on the polarization of photons, which can produce nondeterministic true random unbalanced numbers. The underlying physical process is inherently quantum mechanical. To prove the quality of the output sequence of the proposed generator, we test the obtained bias-free sequence through the 3-standard-deviation criteria and the National Institutes of Standards and Technology test suite. Another type of nondeterministic unbalanced random-number generator is also studied in this work, to evaluate the quality of the output biased random numbers..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021405 (2015)
Diffraction and Gratings
Free space optical beam coupled to surface plasmonic polariton waves via designed grooves in metal film
Yuegang Chen, and Zhiyuan Li
Surface plasmonic polariton (SPP) waves with complicated wavefronts have important implications in nanophotonic sciences and applications. The surface electromagnetic wave holography method is applied to designed grooves on a metal surface for coupling a plane wave in free space to complicated wavefront SPP waves. The Surface plasmonic polariton (SPP) waves with complicated wavefronts have important implications in nanophotonic sciences and applications. The surface electromagnetic wave holography method is applied to designed grooves on a metal surface for coupling a plane wave in free space to complicated wavefront SPP waves. The grooves illuminated by the plane wave incident from free space serve as secondary SPP waves sources, that radiate cylindrical SPP waves. New controllable wavefronts originate from these secondary SPP waves interfering with each other, based on the Huygens–Fresnel principle. Several applications of the method are demonstrated, such as converting coupling waves in free space into focusing SPP waves on a metal surface..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020501 (2015)
Diffractive self-imaging based on selective etching of a ferroelectric domain inversion grating
Yunlin Chen, Tianwei Fan, and Man Tong
A hexagonal array grating based on selective etching of a 2D ferroelectric domain inversion in a periodically poled MgO-doped LiNbO3 crystal is fabricated. The effects to the diffractive self-imaging as a function of diffraction distance for a fixed phase difference and array duty cycle of the grating is theoretically A hexagonal array grating based on selective etching of a 2D ferroelectric domain inversion in a periodically poled MgO-doped LiNbO 3
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020502 (2015)
Fiber Optics and Optical Communications
Wide dynamic range experiments on a resonator fiber optic gyro based on closed-loop frequency locking technique
Yongqiu Zheng, Yongfeng Ren, Panlong An, Chengqun Chu... and Shubin Yan|Show fewer author(s)
Wide dynamic range is an important index of the resonator fiber optic gyro (RFOG). The dynamic range is related to the parameters of the fiber ring resonator (FRR). After adopting the appropriate parameters, the resonant curve of a FRR and the synchronous demodulated curve are measured. Based on the closed-loop frequenWide dynamic range is an important index of the resonator fiber optic gyro (RFOG). The dynamic range is related to the parameters of the fiber ring resonator (FRR). After adopting the appropriate parameters, the resonant curve of a FRR and the synchronous demodulated curve are measured. Based on the closed-loop frequency locking technique, the wide dynamic range is obtained, while the linearity is guaranteed. The experiment’s results show that the dynamic range is ± 480 deg / s
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020601 (2015)
Spin effect on a single-mode single-polarization optical fiber
Minning Ji, Gang-Ding Peng, and Yanhua Luo
The spin effect on a single-mode single-polarization optical fiber is investigated theoretically and numerically. To get a practical single elliptically polarized fiber the normalized spin rate must be in the range of 0.2–0.35. A single elliptically polarized fiber with a normalized spin rate around 0.224 is demonstratThe spin effect on a single-mode single-polarization optical fiber is investigated theoretically and numerically. To get a practical single elliptically polarized fiber the normalized spin rate must be in the range of 0.2–0.35. A single elliptically polarized fiber with a normalized spin rate around 0.224 is demonstrated. It has a broad band from 1.530 to 1.558 μm, in which the low-leakage elliptically polarized eigenmode loss is kept within 1.2 dB while the high-leakage elliptically polarized eigenmode loss is greater than 20 dB. This fiber can be used as an elliptical polarizer or applied in current sensing..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020602 (2015)
Fifty-five km reach, bidirectional, 400 Gb/s (40 × 10 Gb/s), channel-reuse DWDM–PON employing a self-wavelength managed tunable laser
Zhiguo Zhang, Xu Jiang, Jiahe Wang, Xue Chen, and Liqian Wang
We experimentally demonstrate a channel-reuse bidirectional 10 Gb/s/λ long-reach dense wavelength-division multiplexing passive optical network (DWDM-PON) and an optical beat-noise-based automatic wavelength control method for a tunable laser used in a colorless optical network unit (where λ=wavelength). A 55 km, bidirWe experimentally demonstrate a channel-reuse bidirectional 10 Gb / s / λ λ = wavelength 40 × 10 Gb / s
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 020603 (2015)
Imaging Systems
Trapezoidal phase mask coronagraph
Zichen Cao, Qing Cao, Yajun Ge, Rongfei Hu, and Minning Zhu
An angular trapezoidal phase mask used for a wideband coronagraph is proposed. The azimuthal phase of the mask is double-periodic and has both trapezoidal and constant parts in each period. This kind of continuous phase distribution can be employed to avoid the abrupt phase variation of the 6-level phase distribution wAn angular trapezoidal phase mask used for a wideband coronagraph is proposed. The azimuthal phase of the mask is double-periodic and has both trapezoidal and constant parts in each period. This kind of continuous phase distribution can be employed to avoid the abrupt phase variation of the 6-level phase distribution we proposed previously. Numerical calculations show that this more practical phase mask can still keep its superior performance in terms of starlight elimination, small inner working angle, and good achromatism. It is of great importance that there is no singularity in this kind of mask except for a singularity at the center. This mask design is close to real manufacturing conditions, and the process technology is superior..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021101 (2015)
Materials
Few-layer graphene film fabricated by femtosecond pulse laser deposition without catalytic layers
Xiangming Dong, Shibing Liu, Haiying Song, Peng Gu, and Xiaoli Li
The films of few-layer graphene are formed through laser exfoliation of a highly ordered pyrolytic graphite (HOPG), without a catalytic layer for the growth process. The femtosecond (fs) laser exfoliation process is investigated at different laser fluences and substrate temperature. For fs laser exfoliation of HOPG, thThe films of few-layer graphene are formed through laser exfoliation of a highly ordered pyrolytic graphite (HOPG), without a catalytic layer for the growth process. The femtosecond (fs) laser exfoliation process is investigated at different laser fluences and substrate temperature. For fs laser exfoliation of HOPG, the few-layer graphene is obtained at 473 K under an optimal laser fluence. The formation of few-layer graphene is explained by removal of intact graphite sheets occurred by an optimal laser fluence ablation. The new insights may facilitate the controllable synthesis of large area few-layer graphene..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021601 (2015)
Enhancement of the upconversion luminescence in Y2O3:Er3+ powders by codoping with La3+ ions
Ruoshan Lei, Huanping Wang, Shiqing Xu, Yin Tian, and Lihui Huang
Infrared-to-visible upconverted luminescent spectra of Er3+ and La3+ codoped Y2O3 powders are investigated. By introducing La3+ ions, the upconversion green radiation is found to be greatly enhanced when compared with the powders with La3+ absent. Such enhancement can be attributed to the modification of the local symmInfrared-to-visible upconverted luminescent spectra of Er 3 + La 3 + Y 2 O 3 La 3 + La 3 + Er 3 + 4 f Er 3 + Er 3 + F 7 / 2 4 + I 4 11 / 2 → F 4 9 / 2 + F 4 9 / 2
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021602 (2015)
Thin Films
Moisture absorption characteristics of a SiO2 film from 2 to 3 μm
Yun Cui, Hao Li, Kui Yi, and Jianda Shao
We prepare SiO2 coatings on different substrates by either electron-beam evaporation or dual ion-beam sputtering. The relative transmittances of the SiO2 coatings are measured during the heating process. The SiO2 coating microstructures are studied. Results indicate that the intensity and peak position of moisture absoWe prepare SiO 2 SiO 2 SiO 2
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 023101 (2015)
Optical Design and Fabrication
Rapid fabrication of terahertz lens via three-dimensional printing technology
Zhongqi Zhang, Xuli Wei, Changming Liu, Kejia Wang... and Zhengang Yang|Show fewer author(s)
We design a plano-convex lens working in the terahertz (THz) frequency range and fabricate it using three-dimensional (3D) printing technology. A 3D field scanner is used to measure its focal properties, and the results agree well with the numerical simulations. The refractive index and absorption coefficient measuremeWe design a plano-convex lens working in the terahertz (THz) frequency range and fabricate it using three-dimensional (3D) printing technology. A 3D field scanner is used to measure its focal properties, and the results agree well with the numerical simulations. The refractive index and absorption coefficient measurements via THz time-domain spectroscopy (THz-TDS) reveal that the lens material is highly transparent at THz frequencies. It is expected that this inexpensive and rapid 3D printing technology holds promise for making various THz optical elements..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 022201 (2015)
Integrated Optics
Study of selectively buried ion-exchange glass waveguides using backside masking
Chongyang Pei, Gencheng Wang, Bing Yang, Longzhi Yang... and Jianyi Yang|Show fewer author(s)
In this Letter, we study the characteristics of a selectively buried glass waveguide that is fabricated by the backside masking method. The results show that the surface region appears when the width of the backside mask is larger than 7 mm. Here, the glass substrate is 1.5 mm thick. It is also found that the buried deIn this Letter, we study the characteristics of a selectively buried glass waveguide that is fabricated by the backside masking method. The results show that the surface region appears when the width of the backside mask is larger than 7 mm. Here, the glass substrate is 1.5 mm thick. It is also found that the buried depth evolution of the transition region remains almost unchanged and is independent of the width of the backside mask. The loss of the transition region is only 0.28 dB at the wavelength of 1.55 μm if the surface condition is good enough..
Chinese Optics Letters
- Publication Date: Feb. 10, 2015
- Vol. 13, Issue 2, 021301 (2015)
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