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SKLTOP published key papers(2007)

1. December 15, 2007 / 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 76, 013811 _2007_

Unified theory for Goos-Hänchen and Imbert-Fedorov effects
Chun-Fang Li
Department of Physics, Shanghai University, Shanghai 200444, People’s Republic of China and State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, People’s Republic of China
_Received 1 November 2006; published 12 July 2007_

Abstract. A unified theory is advanced to describe both the lateral Goos-Hänchen _GH_ effect and the transverse Imbert-Fedorov _IF_ effect, through representing the vector angular spectrum of a three-dimensional light beam in terms of a two-form angular spectrum consisting of its two orthogonal polarized components. From this theory, the quantization characteristics of the GH and IF displacements are obtained, and the Artmann formula for the GH displacement is derived. It is found that the eigenstates of the GH displacement are the twoorthogonal linear polarizations in this two-form representation, and the eigenstates of the IF displacement arethe two orthogonal circular polarizations. The theoretical predictions are found to be in agreement with recentexperimental results.

DOI: 10.1103/PhysRevA.76.013811 PACS number_s_: 42.25.Gy, 41.20.Jb, 42.25.Ja

3.  November 15, 2007 / Vol. 32, No. 22 / OPTICS LETTERS 3367

Description of a radially polarized Laguerre–Gauss beam beyond the paraxial approximation
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

Abstract. Fifth-order corrected expressions for the fields of a radially polarized Laguerre–Gauss (R-TEMn1) laser beams are derived based on perturbative Lax series expansion. When the order of Laguerre polynomial is equal to zero, the corresponding beam reduces to the lowest-order radially polarized beam (R-TEM01). Simulation results show that the accuracy of the fifth-order correction for R-TEMn1 depends not only on the diffraction angle of the beam as R-TEM01 does, but also on the order of the beam. 

4.  PHYSICAL REVIEW A 76, 053836 (2007)

Radiation forces of a highly focused radially polarized beam on spherical particles
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

Abstract. A radially polarized beam focused by a high-numerical-aperture (NA) objective has a strong longitudinal and nonpropagating electric field in the focal region, which implies that it is suitable for axial optical trapping. In this paper, we use the vectorial diffraction integral to represent the field distribution of the radially polarized beam focused by a high-NA objective and then employ the T-matrix method to compute the radiation forces on spherical particles. Effects of different parameters, such as the size of the sphere, the inner radius of the radially polarized beam, and the NA of the objective, on the radiation forces are presented.

5.  9 July2007,Vol.115,No.14/OPTICS EXPRESS 8938

Color center conversion by femtosecond pulse laser irradiation in LiF:F2 crystals
Cheng Guanghua, Wang Yishan, He Junfang, Chen Guofu ,Zhao Wei
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 report the observation of intense spontaneous emission of green light from LiF:F2:F3 + centers in active channel waveguides generated in lithium fluoride crystals by near-infrared femtosecond laser radiation. While irradiating the crystal at room temperature with 405 nm light from a laser diode, yellow and green emission was seen by the naked eye. Stripe waveguides were fabricated by translating the crystal along the irradiated laser pulse, and their guiding properties and fluorescence spectra at 540 nm demonstrated. This single-step process inducing a waveguide structure offers a good prospect for the development of a waveguide laser in bulk LiF crystals.

6.  16 April 2007/Vol.15,No.8/OPTICS EXPRESS 4493

Non-collinear CPOPA seeded by Yb3+-doped self-starting passive mode-locked fiber laser
Wang Hongying*, Liu hongjun, Li Xiaoli*, Zaho Wei
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. Using a home-made seed at 1053 nm from a Yb3+-doped passively mode-locked fiber laser of 1.5 nJ/pulse, 362 ps pulse duration with a repetition rate of 3.842 MHz, a compact, low cost, stable and excellent beam quality non-collinear chirped pulse optical parametric amplifier omitting the bulky pulse stretcher has been demonstrated. A gain higher than 4.0×106, single pulse energy exceeding 6 mJ with fluctuations less than 2% rms, 14 nm amplified signal spectrum and recompressed pulse duration of 525 fs are achieved. This provides a novel and simple amplification scheme.

7.  Optics Communications 280 (2007) 147-152

A novel ultra-narrow transmission-band fiber Bragg grating and its application in a single-longitudinal-mode fiber laser with improved efficiency
Liu Xueming
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. A novel design approach to ultra-narrow transmission-band fiber Bragg grating (FBG) is proposed and demonstrated for the first time. The new grating consists of multiple identical distributed-Bragg reflector (DBR) cavities and a π-phase-shifted gap, and hence, the proposed laser is constructed by the cascade of these identical DBR fiber lasers. By manufacturing the proposed grating in a piece of Er–Yb codoped fiber, a single-wavelength single-longitudinal-mode (SLM) fiber laser with improved efficiency is demonstrated experimentally. The experimental results show that the pump-to-signal conversion efficiency of the proposed laser is improved by a factor of two in comparison with the optimized distributed-feedback (DFB) fiber lasers. 

8.  APPLIED PHYSICS LETTERS 91,041909 (2007)

Nonlinear optical properties of semiconductor quantum wells under intense terahertz radiation
Zhang Tongyi, Zhao Wei, Liu Xueming, C Zhang#
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. The nonlinear optical properties of semiconductor quantum wells driven by intense in-plane terahertz electric fields are investigated theoretically by employing the extended semiconductor Bloch equations. The dynamical Franz-Keldysh effect of the optical absorption near the band edge is analyzed with Coulomb correlation among the carriers included. The in-plane terahertz field induces a variety of behavior in the absorption spectra, including terahertz replicas of the (dark) 2p exciton and terahertz sidebands of the 1s exciton. The dependence of these interesting features on the intensity, frequency, and phase of the terahertz field is explored in detail.

9.  Applied Physics B 87,469-473(2007)

One-dimensional incoherently coupled grey solitons in two-photon photorefractive media
Lu Keqing, Zhao Wei,Yang Yanlong, Yang Yang*, Zhang Meizhi*, R.A.RUPP#, M.FALLY#, Y.Zhang# ,J.XU#
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 show that grey solitons, grey–grey soliton pairs, and multi-component grey solitons can be realized in twophoton photorefractive media. The results for soliton pairs and multi-component solitons are derived under the assumption that the carrier beams share the same polarization, wavelength, and are mutually incoherent.

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