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- Yangjian Cai, Xuanhui Lu, Qiang Lin
- Optics letters
- 2003

A new mathematical model, described as hollow Gaussian beams (HGBs), is proposed to describe a dark hollow laser beam (DHB). The area of the dark region across the HGBs can easily be controlled by proper choice of the beam parameters. Based on the Collins integral, an analytical propagation formula for the HGBs through a paraxial optical system is derived.â€¦ (More)

- Yunfeng Jiang, Kaikai Huang, Xuanhui Lu
- Optics express
- 2011

The radiation force of highly focused Lorentz-Gauss beams (LG beam) on a dielectric sphere in the Rayleigh scattering regime is theoretically studied. The numerical results show that the Lorentz-Gauss beam can be used to trap particles with the refractive index larger than that of the ambient. The radiation force distribution has been studied underâ€¦ (More)

- Nan Li, Yunfeng Jiang, Kaikai Huang, Xuanhui Lu
- Optics express
- 2014

We theoretically and experimentally study the propagation characteristics of the circular Airy beam (CAB) when its first few light rings are blocked. It is shown that the focus position of the blocked CAB will remain the same, and its abruptly autofocusing property will be enhanced. Since the maximum focal intensity almost remains the same when the firstâ€¦ (More)

- Yunfeng Jiang, Xiuwei Zhu, Wenlei Yu, Hehong Shao, Wanting Zheng, Xuanhui Lu
- Optics express
- 2015

We have proposed a kind of modified circular Airy beam (MCAB) based upon a modification of the Fourier spectrum of circular Airy beams (CAB) in this paper. Unlike most abruptly autofocusing beams, the position of peak intensity of MCAB can be moved to any rings behind. Two apodization parameters are introduced to describe the propagation characteristics ofâ€¦ (More)

- Yunfeng Jiang, Kaikai Huang, Xuanhui Lu
- Optics express
- 2013

The radiation force of circular Airy beams (CAB) on a dielectric Rayleigh particle is investigated in this paper. Our results show that the CAB can be used to trap the particle whose refractive index is larger than the ambient at different positions along the beam axis. Comparing with the Gaussian beam under the same conditions, the longitudinal and theâ€¦ (More)

- Yunfeng Jiang, Kaikai Huang, Xuanhui Lu
- Optics express
- 2012

We investigated the propagation dynamics of the Circular Airy Beams (CAB) with optical vortices (OVs) by numerical calculation. Comparing to the common CAB, the maximum intensity of CAB with vortices can be increased greatly at the focal plane and its focal intensity profile is doughnut-shaped when an on-axis vortex is imposed. The case for an off-axis OVâ€¦ (More)

- Xuanhui Lu, Fanzhou Cheng, Yu-cai Yao
- Zhonghua jie he he hu xi za zhi = Zhonghua jieheâ€¦
- 1998

OBJECTIVE
To understand the effect of the World Bank-loaned tuberculosis control project in Ningxia Hui autonomous region.
METHOD
Five counties which can reflect the situation of tuberculosis control in Ningxia were selected for observation, and the same method of surveillance was carried out. The subjects investigated were required to fill in theâ€¦ (More)

- Chengliang Zhao, Xuanhui Lu, Yangjian Cai
- 2008 IEEE PhotonicsGlobal@Singapore
- 2008

Propagations of coherent and partially coherent flat-topped beams through a focusing optical system are formulated. The radiation force on a Rayleigh dielectric sphere induced by focused coherent and partially coherent flat-topped beams is investigated theoretically. It is found that we can increase the transverse trapping range at the planes near the focalâ€¦ (More)

- Zhouxiang Xu, Xian Zhang, Kaikai Huang, Xuanhui Lu
- The Review of scientific instruments
- 2012

We have designed and implemented a highly digital optical phase-locked loop (OPLL) for diode lasers in atom interferometry. The three parts of controlling circuit in this OPLL, including phase and frequency detector (PFD), loop filter and proportional integral derivative (PID) controller, are implemented in a single field programmable gate array chip. Aâ€¦ (More)

A low diffraction beam is obtained by altering the existing resonator of a CO2 laser using a special phase plate. The phase plate is designed based on the boundary diffraction principle and is implemented on the resonator rear mirror. It is found that the low diffraction beam has a smaller M 2 value than that of a Gaussian beam. The effects of the improvedâ€¦ (More)