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Fu L.,Zhongshan Polytechnic College | Li B.,Tianjin University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

An efficient method of 593 nm yellow laser with a single LD pump source and Nd:YVO 4 double crystals was reported. The theory was analyzed, the experiment device was designed and the experiment result was verified. The device was composed of laser diode, optical coupling system, Nd:YVO 4 crystals, plan-curved mirror, LBO and totally reflecting mirror. By using V-type resonant cavity, with in cident pump source with the 5 W power and the 808.7 nm wavelength, the experiment adopts type I critical phase-matched LBO as sum-frequency crystal, and the 244 mW yellow laser at 593 nm was obtained. The optical to optical conversion efficiency was 4.9%, the laser instability was about 5%. The experiment result shows that the intra-cavity sum-frequency in V-type resonant cavity can obtain 593 nm laser, and the method has structure compact and high conversion efficiency advantages, and can be used in many sum-frequency laser.


Jia H.,Henan Polytechnic University | Guo Z.,Henan Polytechnic University | Liu Y.,Zhongshan Polytechnic College
2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce, AIMSEC 2011 - Proceedings | Year: 2011

Recently IPv6 test network has already had considerable scale and relatively abundant network resources. Especially streaming media resources have been established in order to attract more and more users to access it.There is a kind of implementation method of network TV wall based on the streaming media and IPv6 presented in this paper.Compared with the traditional interface,it has visibility and can be monitored,and for the real TV wall it has economics and can be monitored remotely. At the same time it has great practicality because it allows users to quasi-real-time understand the content of streaming media. © 2011 IEEE.


Fu L.,Zhongshan Polytechnic College | Liu H.,North University of China
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2011

In order to overcome the mechanical scanning and poor real-time software processing in spectrum recovery, a sort of static Fourier transform spectrometry system based on FPGA was studied. Based on the Fourier transform spectrometry theory, the design scheme of the system is established by using a modified wedge interferometer, a linear CMOS detector and FPGA. The principles of the system are described in detail. In the Field Programmable Gate Array of Xilinx's chip, the Verilog Hardware Designing Language is used to design the system modules, which contain the CMOS driving circuit, spectrum recovery processing circuit and so on. And the functional simulations of each module are completed with the third-party simulation software: Modelsim6.3f. The system is used to measure the spectra of 635 nm semiconductor lasers. The measurement results are concordant with the MATLAB simulation values. It shows that this system has the advantages of real-time, high reliability and fast speed.


Gui C.,Zhongshan Profession and Technology College | Guo C.,Zhongshan Polytechnic College | Liu Y.,Zhongshan Polytechnic
Applied Mechanics and Materials | Year: 2011

This text make a detailed introduction and comparative analysis on the type , the work mode, analysis and design method, and control method...etc of the high frequency resonance transform machine to the current electrostatic dust separator and at the same time it also make a tally up the problem that the key wants to work out. © (2011) Trans Tech Publications.


Fu L.,Zhongshan Polytechnic College
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2010

In order to measure the parameters and azimuth of the incident laser, a laser warning optical system based on grating is designed. The incident laser strips passing through the sinusoidal transmission grating only diffract zero and first order, which is useful for signal sampling and processing. This optical system is consisted of shade, sinusoidal grating, plane-convex cylindrical lens and a linear CCD. Parameters of all the optical devices are decided by theoretical analysis and calculation. The experimental results show that the laser warning device can realize measurements of the laser with the wavelength range of 500~1100 nm, wavelength resolution no more than 10 nm, azimuth resolution no more than 10 and the field of view of 22.5°.

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