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SKLTOP published key papers(2010)

State Key Laboratory of Transient Optics and Photonics

1. OPTICS EXPRESS,2010, Vol.18, N.22, P.23024-23029

Generation and amplification of high-energy nanosecond pulses in a compact all-fiber laser

Dong Mao, Xueming Liu,* Leiran Wang, Hua Lu, and Huan Feng

State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China

*liuxueming72@yahoo.com

Abstract: We have experimentally investigated high-energy rectangular pulses delivering from an erbium-doped fiber laser operating in ultra-large net-negative-dispersion regime. The laser oscillator emits rectangular pulses with approximately Gaussian spectral profiles, adjustable nanoseconds durations, and multi-ten nanojoule energies. The outputted pulses can be further amplified to over 2 μJ without distortion by a two-stage erbium-doped fiber amplifier. Thus, rectangular pulses with controllable durations and energies can be achieved from the compact all-fiber fiber laser system.

2. OPTICS EXPRESS,2010, Vol.18, N.3, P.3101-3108

Influence of the time modulation of the pump laser caused by mode beating on optical parametric process

Qibing Sun1, 2, Hongjun Liu1*, Nan Huang1, Hanbo Long1, 2, Jin Wen1, 2, Shaolan Zhu1, and Wei Zhao1

1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an, 710119, China

2Graduate University of CAS, Beijing, 100049, China

*liuhongjun@opt.ac.cn

Abstract: Numerical simulation and analysis about the influence of the time modulation of the pump laser caused by mode beating on optical parametric process are presented with OPA and OPG as examples. It is shown that the output power of the generated beams from optical parametric process is modulated in the time domain and exhibits large power fluctuations, when a Q-switched laser oscillating on several random longitudinal modes is used as the pump laser. Irregular spike sequences of the generated beams are observed. We also find that the output power of the light from optical parametric process becomes more stable and exhibits a less fluctuation, when the number of the longitudinal modes (n) increases.

3. OPTICS EXPRESS, 2010, Vol.18, N.7, P.7263-7268

All-fiber mode-locked nanosecond laser employing intracavity chirped fiber gratings

Hushan Wang1, Yishan Wang1,*,Wei Zhao1, Ting Zhang1, Xiaohong Hu1, Zhi Yang1, Hongjun Liu1, Kailiang Duan1, Xuemin Liu1, Cheng Li1, Deyuan Shen1, Zhan Sui2, and Bin Liu3,4

1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China

2Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

3Department of EEIS, University of Science and Technology of China, Hefei, Anhui 230027, China

4Hefei Sunshine Optoelectronics Science & Technology co., Ltd, Hefei 230088, China

* yshwang@opt.ac.cn

Abstract: We demonstrate that nanosecond pulses are generated directly from an all-fiber mode-locked ytterbium-doped fiber laser. A pair of Chirped Fiber Gratings (CFGs) with different sign of dispersion is employed for intracavity dispersion management. Self-starting stabilized mode-locking operation is achieved by nonlinear polarization evolution (NPE). The 1.27 ns pulses are obtained after one CFG with large positive dispersion. The pulse energy is up to 15 nJ at a repetition rate of 3.48 MHz.

4.PHYSICAL REVIEW A 81, 053819 (2010)

Pulse evolution without wave breaking in a strongly dissipative-dispersive laser system

Xueming Liu*

State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics,

Chinese Academy of Sciences, Xi’an 710119, China

(Received 8 March 2010; published 12 May 2010)

Abstract: We report on pulse evolution without wave breaking in a strongly dissipative-dispersive laser system where pulses encounter significant amounts of positive and negative dispersions. In contrast to conventional soliton, dispersion-managed soliton, and self-similar pulse evolutions, a different type of pulse shaping in mode-locked lasers is theoretically investigated and experimentally observed. The pulses of this laser have very low frequency chirp and exhibit as the quasirectangle temporal and Gaussian spectral profiles, and the spectral width is almost independent of the pumping strength. The temporal and spectral widths fluctuate as low as ∼3% of the relative fluctuation throughout the laser cavity. Both numerical and experimental results show that the pulses exist with energies much greater than can be tolerated in self-similar pulse shaping.

5. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION,2010, Vol.27,N.9, P.2033-2037

Generation of multiple spherical spots with radially polarized beam in 4 focusing system

Shaohui Yan1, Baoli Yao1*, Wei Zhao1, Ming Lei2

1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, P. R. China

2College of Life Science and Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A & F University, Yangling 712100, P. R. China

*Corresponding author: yaobl@opt.ac.cn

Abstract:We demonstrate the possibility of creating multiple spherical spots in 4 focusing system with a radially polarized beam. Using spherical waves to expand the plane wave factor in the Richards–Wolf integral, it is found that a proper spatial modulation in the amplitude of input filed with radial polarization can form multiple spherical spots with a focusing system satisfying the Herschel condition. These spots are distributed symmetrically about the focus on the optical axis with variable positions and intensity. Although we consider only the case of three spherical spots in this paper, the generalization to multiple spots case will present no difficulty.

6. APPLIED OPTICS,2010, Vol.49, N.26, P.4984-498 

Nonlinear chirped-pulse propagation and supercontinuum generation in Photonic crystal fibers

Xiaohong Hu, Yishan Wang,* Wei Zhao, Zhi Yang, Wei Zhang, Cheng Li, and Hushan Wang

State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China

*Corresponding author: yshwang@opt.ac.cn

Abstract: Based on the generalized nonlinear Schrödinger equation and waveguiding properties typical of photonic crystal fiber structure, nonlinear chirped pulse propagation and supercontinua generation in the femtosecond and picosecond regime are investigated numerically. The simulation results indicate that an input chirp parameter mainly affects the initial stage of spectral broadening caused by self-phase modulation (SPM) effect. In the femtosecond regime where SPM effect plays an important role in the process of spectral broadening, an input positive chirp can enhance the supercontinuum bandwidth through a modified pulse compression phase and a decreased propagation distance required by soliton fission. In the picosecond regime where SPM effect contributes less to the continuum bandwidth and four-wave mixing process or modulational instability dominates the initial stage of spectral and temporal evolution, the output spectral shape and bandwidths are less sensitive to the input chirp parameters.

7. APPLIED OPTICS,2010, Vol.49, N.34, P.6612-6616 

Parallel phase-shifting interferometry based on Michelson-like Michelson architecture

Junwei Min1,2, Baoli Yao1,*Peng Gao1, Rongli Guo1 Juanjuan Zheng1, Tong Ye1

1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and

Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
2Graduate School of the Chinese Academy of Sciences, Beijing 100039, China

*Corresponding author: yaobl@opt.ac.cn

Abstract:In this paper, we present a new scheme for parallel phase-shifting interferometry which employs a Michelson-like Michelson architecture and a simple polarization unit to generate two phase-shifting interferograms with phase shift of /2 at a single camera exposure. The parallel phase-shifting unit is built with simple optical components, and the distance between the parallel interferograms can be adjusted conveniently. Phase reconstruction is performed by using a developed algorithm for two-step phase-shifting interferometry. The practicability of the proposed configuration and the reconstruction method is demonstrated by experiments.

8. OPTICS COMMUNICATIONS,2010, Vol.283, N.11, P.2390-2393

Experimental Study on Phase-locking of Two High Power All-fiber Lasers

Baoyin Zhao1, 2 Kailang Duan1,* Wei Zhao1

1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics,

ChineseAcademy of Sciences, Xi’an 710119, China

2GraduateUniversity of ChineseAcademy of Sciences, Beijing 100049, China

*Corresponding author. Tel.: +86 29 88887617.

E-mail address: kl.duan@tom.com (K. L. Duan).

Abstract:By using a novel mutual injection technique, phase-locking and coherent combining of two high power all-fiber lasers are realized and experimentally demonstrated. Steady interference strips with high visibility of 46% are observed. The coherent combined 407 W CW output power with a power-combining efficiency of up to 98% is obtained. The laser array works well with excellent stability. In the long time of high power operation no thermal distortions or damages are observed. The experiment results reveal that the proposed technique can be used to further scaleup the coherent combined output power of high power fiber lasers.

9. JOURNAL OF OPTICS,2010, Vol.12, N.9, P.095204

Low-timing-jitter, Stretched-pulse Passively Mode-locked Fiber Laser with Tunable Repetition Rate and High Operation Stability

Yuanshan Liu1,*, Jian-Guo Zhang1,2, Guofu Chen1, Wei Zhao1, Jing Bai1

1State Key Laboratory of Transient Optics & Photonics, Xi'an Institute of Optics & Precision

Mechanics, Chinese Academy of Sciences, Xi'an, 710119, China

    2Department of Engineering and Design, London South Bank University, London SE1 0AA, UK

*Corresponding author: yuanshanliu@gmail.com

Abstract:We design a low-timing-jitter, repetition-rate tunable, stretched-pulse passively mode-locked fiber laser by using a nonlinear amplifying loop mirror (NALM), a semiconductor saturable absorber mirror (SESAM), and a tunable optical delay line in the laser configuration. Low-timing-jitter optical pulses are stably produced when a SESAM and a 0.16-m dispersion compensation fiber are employed in the laser cavity. By inserting a tunable optical delay line between NALM and SESAM, the variable repetition-rate operation of a self-starting, passively mode-locked fiber laser is successfully demonstrated over a range from 49.65 MHz to 50.47 MHz. The experimental results show that the newly designed fiber laser can maintain the mode locking at the pumping power of 160 mW to stably generate periodic optical pulses with width less than 170 fs and timing jitter lower than 75 fs in the 1.55-μm wavelength region, when the fundamental repetition rate of the laser is continuously tuned between 49.65 MHz and 50.47 MHz. Moreover, this fiber laser has a feature of turn-key operation with high repeatability of its fundamental repetition rate in practice.

10. JOURNAL OF OPTICS,2010, Vol.12, N.8, P.085401

Generation of 10 GHz, 1.9 ps optical pulse train using semiconductor optical amplifier and silica-based highly nonlinear fiber

Shuangyi Yan1, Xiaoping Xie1,2, Zhanqiang Hui1, Huan Feng1 andWei Zhao1

1 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and

Precision Mechanics, CAS, Xi’an 710119, People’s Republic of China

2 Xi’an Telecommunication College, Xi’an 710106, People’s Republic of China

E-mail: nechoyan@gmail.com

Abstract:We propose a simple approach to generate a high quality 10 GHz 1.9 ps optical pulse train using a semiconductor optical amplifier and silica-based highly nonlinear fiber. An optical pulse generator based on our proposed scheme is easy to set up with commercially available optical components. A 10 GHz, 1.9 ps optical pulse train is obtained with timing jitter as low as 60 fs over the frequency range 10 Hz–1 MHz. With a wavelength tunable CW laser, a wide wavelength tunable span can be achieved over the entire C band. The proposed optical pulse generator also can operate at different repetition rates from 3 to 10 GHz.

11. IEEE Transactions on Knowledge and Data Engineering (T-KDE), 2010,Vol.22No.1,P145-149

Deterministic Column-Based Matrix Decomposition

Xuelong Li, and Yanwei Pang

X. Li is with the State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, Shaanxi, China. E-mail: xuelong_li@opt.ac.cn.

Y. Pang is with the School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China. E-mail: pyw@tju.edu.cn.

 

Abstract: In this paper, we propose a deterministic column-based matrix decomposition method. Conventional column-based matrix decomposition (CX) computes the columns by randomly sampling columns of the data matrix. Instead, the newly proposed method (termed as CX_D) selects columns in a deterministic manner, which well approximates singular value decomposition. The experimental results well demonstrate the power and the advantages of the proposed method upon three real-world data sets.

12. Optics Express,2010, Vol.18, N.24, P.26307-26312

The effect of added O2 on the transmittance and radiation resistance of radiation resistant glasses

Weinan Li, Min Lu*

State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS) , Xi’an, Shanxi 710119, PR China
*Corresponding author: lumin@opt.ac.cn

Abstract: One method of hardening optical glasses against radiation-induced darkening has been to add CeO2 to the batch composition. In the present investigation we prepared a series of lanthanum crown glasses with varying degrees of CeO2 additions and melted them at 1,400℃ with and without bubbling oxygen gas. We examined the influence of added oxygen on the optical transmissions of these glasses in the spectral range 460 to 760 nm following gamma irradiations ranging from 10 to 250 krad. The results showed that dose-for-dose the radiation-induced optical attenuations of the oxidized glasses were greater than for the glasses without added O2

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