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SKLTOP published key papers(2008)

1. December 15, 2008 / Vol. 32, No. 24 / OPTICS LETTERS 3543

Integral transformation solution of free-space cylindrical vector beams and prediction of modified Bessel–Gaussian vector beams
Chun-Fang Li1,2,*
1Department of Physics, Shanghai University, Shanghai 200444, China
2State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of the Chinese Academy of Sciences, Xi’an 710119, China
*Corresponding author: cfli@shu.edu.cn
Received September 21, 2007; revised November 8, 2007; accepted November 10, 2007;
posted November 13, 2007 (Doc. ID 87684); published December 11, 2007

Abstract. A unified description of free-space cylindrical vector beams is presented that is an integral transformationsolution to the vector Helmholtz equation and the transversality condition. In the paraxial condition, thissolution not only includes the known J1Bessel–Gaussian vector beam and the axisymmetric Laguerre–Gaussian vector beam that were obtained by solving the paraxial wave equations but also predicts two kinds of vector beam, called a modified Bessel–Gaussian vector beam. © 2007 Optical Society of America
OCIS codes: 260.2110, 140.3295, 350.5500.

2. PHYSICAL REVIEW A 77, 043818 (2008)

Theory and experiments for multiple four-wave-mixing processes with multifrequency pumps in optical fibers
X.-M. Liu*
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710068, China(Received 16 December 2007; revised manuscript received 19 February 2008; published 14 April 2008)

Abstract. Multiple four-wave-mixing (FWM) processes with multifrequency pumps in optical fibers are investigated theoretically and experimentally. The propagation equations describing the FWM nonlinear interactions between pump waves and “first-order” sideband waves are derived. Based on our theoretical model, the rigorous nonlinear equations governing arbitrary pumps can be developed when the pump waves have equal frequency spacing. The proposed theory can generalize the traditional theory of FWM processes. The rigorous nonlinear equations governing three pumps and three cases of simplified equations governing three, four, and five pumps are achieved. Numerical simulations for three, four, and five pumps are experimentally tested by using a piece of highly nonlinear photonic-crystal fiber, and the experimental observations confirmed our theoretical predictions. The stabilization of waves by multiple FWM processes is proved theoretically and confirmed experimentally.

3. OPTICS COMMUNICATIONS 281,P49-54 (2008)

Waveguides induced by steady-state gray solitons in biased photorefractive-photovoltaic crystals
Keqing Lu, Wei Zhao, Yanlong Yang, Meizhi Zhang, Yang Yang, Lei Zhang and Xueming Liu
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academic of Sciences, Xi’an 710068, China
Yongzhuang Chen
Shangluo University, Shaanxi Shangluo 726000, China
Yanpeng Zhang
Department of Electronic Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Jingjun Xu
Department of Physics, Nankai University, Tianjin 300071, China

Abstract.  We carry out a theoretical investigation of the properties of waveguides induced by photorefractive one-dimensional steady-state gray spatial solitons (i.e., screening solitons, photovoltaic solitons, and screening-photovoltaic solitons). We demonstrate that waveguides induced by photorefractive steady-state gray spatial solitons are only a single guided mode for both all soliton graynesses and all values of , where  is the ratio between the soliton peak intensity and the dark irradiance, and moreover, waveguides induced by gray photovoltaic solitons for closed-circuit condition are also only a single guided mode for all electric current densities. We find that the confined energy near the center of a photorefractive steady-state gray spatial soliton increases with  and decreases with an increase in the soliton grayness. We also find that the confined energy near the center of a gray photovoltaic soliton for closed-circuit condition increases with the electric current density. On the other hand, waveguides induced by gray screening-photovoltaic solitons are gray screening soliton-induced waveguides when the bulk photovoltaic effect is neglectable and are gray photovoltaic soliton-induced waveguides when the external bias field is absent.

4. EUROPHYSICS LETTERS Vol.82,67001(2008)

Magnetoexcitonic optical absorption in semiconductors under strong magnetic fields and intense terahertz radiation in the Voigt configuration
Tong-Yi Zhang(a) and Wei Zhao
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences - 17 Xinxi Road, Xi’an, 710119, PRC

Abstract. The magnetoexcitonic optical absorption of a GaAs bulk semiconductor driven by a terahertz (THz) field is investigated numerically. The method of the solution of the initial value problem, in combination with the perfect matched layer technique, is used to calculate the optical susceptibility, with Coulomb interaction, Landau quantization, and THz fields involved nonperturbatively. It shows that there appear replicas and sidebands of magnetoexciton of different Landau levels, which greatly enrich the magneto-optical spectrum in the presence of a driving THz field.

5. OPTICS COMMUNICATIONS Vol.281,958-964(2008)

Analysis of Polarization Dependence for OTDM Demultiplexers Based on Four-Wavelength Mixing in Semiconductor Optical Amplifier
Xiao-Ping Xie1,2,  Jian-Guo Zhang1,3,  Wei Zhao1,  Yu Wen2
1 State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics, Chinese Academy Sciences

Xi’an 710119, China
2 Xi’an Communication College, Xi’an 710106, China
3 Department of Electrical, Computer and Communications Engineering London South Bank University, 103 Borough Road, London SE1 0AA, UK

Abstract: In optical time-division multiplexing (OTDM) systems using the four-wave mixing (FWM) in a semiconductor optical amplifier (SOA) for time demultiplexing, the polarization states of control pulse and OTDM data lights are an important factor in the optical time demultiplexing process, which can influence the bit error rate (BER) of OTDM systems. In this paper, we analyze the effect of light polarization states on the FWM of a SOA, and use a simulation approach to study the BER performance of 100Gbit/s OTDM systems that use the FWM in a SOA for optical time demultiplexing. It reveals that the BER or Q factor of OTDM systems is dependent on the misalignment  between the polarization states of OTDM data and control lights. With increasing , both the optical power of resulting FWM component and the BER performance (or Q factor) of OTDM systems is degraded. For linearly polarized lights, our results show that the increase of BER and the reduction in Q factor are made smoothly when  changes its value from 00 to 750, whereas the degradation of BER and Q factor becomes rapid when  exceeds 750. Although the best system BER is obtained for , the BER performance can still tolerate some misalignment  (e.g., up to 200 in our simulation). This is useful for the engineering design and applications of SOA-based optical time demultiplexers.
Key words: Optical time-division multiplexing, optical time demultiplexer, four-wavelength mixing, semiconductor optical amplifier, polarization state, bit error rate, optical communications

6. OPTICS EXPRESS Vol.33,No.10,P1074-1076(2008)

Compact tunable high power picosecond source based on Yb-doped fiber amplification of gain switch laser diode
Hongjun Liu,* Cunxiao Gao, JintaoTao, Wei Zhao and Yishan Wang
State Key Laboratory of Transient Optics and Photonics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China *

Abstract: Corresponding author: liuhongjun@opt.ac.cn Abstract: A compact tunable high power picosecond source based on Ybdoped fiber amplification of gain switch laser diode is demonstrated. A multi-stage single mode Yb-doped fiber preamplifier was combined with a single mode double-clad Yb-doped fiber main amplifier to construct the amplification system, which is seeded by a gain switch laser diode. By optimizing preamplifier’s parameters to compensate the seed spectrum gain, a “flat top” broadband spectrum is obtained to realize wavelength tunable output with a self-made tunable filter. The tunable pulses were further amplified to 3.5 W average power 90 ps pulses at 1 MHz repetition rate, and the center wavelength was tunable in the ranges from 1053 nm to 1073 nm with excellent beam quality.

7. OPTICS LETTERS / Vol. 33, No. 10P.1074 / May 15, 2008

Exact description of a cylindrically symmetrical complex-argument Laguerre–Gauss beam
Shaohui Yan1,2 and Baoli Yao1
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
Received January 3, 2008; revised March 27, 2008; accepted March 28, 2008;
posted April 9, 2008 (Doc. ID 91267); published May 9, 2008

Abstract: Based on the perturbative series representation of a complex-source-point spherical wave an expression forcylindrically symmetrical complex-argument Laguerre–Gauss beams of radial order n is derived. This descriptionacquires the accuracy up to any order of diffraction angle, and its first three corrected terms are inaccordance with those given by Seshadri [Opt. Lett. 27, 1872 (2002)] based on the virtual source method.Numerical results show that on the beam axis the number of orders of nonvanishing nonparaxial correctionsis equal to n. Meanwhile a higher radial mode number n leads to a smaller convergent domain of radius.

8. Journal of Biomedical Optics 13_4_, 044024 _July/August 2008_

Multifunctional darkfield microscopy using an axicon
Ming Lei,Baoli Yao
State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119, China

Abstract. We present a multifunctional darkfield microscopy using anaxicon. It combines the functions of a darkfield microscope, fluorescencemicroscope, and microspectrophotometer in one platform. Theadvantage of the system over conventional darkfield microscopy includes the high transmittance of the illuminating flux, the high contrastof the image, and the convenient toggle between darkfield andbrightfield microscopy. Examples of dark, bright, and fluorescent micrographsas well as concerned spectra of microsized specimens implemented in this apparatus are demonstrated.
© 2008 Society of Photo-Optical Instrumentation Engineers. _DOI: 10.1117/1.2960019_
Keywords: axicon; darkfield microscopy; fluorescence microscopy; microspectrophotometer.

Paper 07396RR received Sep. 24, 2007; revised manuscript received Feb. 15, 2008;

accepted for publication Feb. 29, 2008; published online Jul. 24, 2008.

9. Optics Communications 281 (2008) 2557-2560

Experimental study of phase-locking of two photonic crystal fiber lasers
Kailiang Duan*, Jianming Wang, Jianfeng Li, Yishan Wang, Zhenyu Zhao, Wei Zhao
Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
Received 2 October 2007; received in revised form 8 December 2007; accepted 17 December 2007

Abstract:Two photonic crystal fiber (PCF) lasers are phase-locked by using self-imaging resonator techniques. Obvious and steady interference strips are observed even without using spatial filter in high power operation, which demonstrates the advantages of pure single-mode PCF lasers in coherent beam combining. The maximum coherent output power of 95.8W is obtained with coupling efficiency of 90.2%.
@ 2008 Elsevier B.V. All rights reserved.
Key words: Photonic crystal fiber; phase-locking, self-imaging resonator, interference strip.

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