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《Opto-electronic Engineering》 2005-07
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Measurement of pulsed-laser wavelength and direction in real time by grating diffraction method

FU Lin, ZANG Ji-long, WANG Zhi-bin (The key Laboratory of the State Education Ministry on Instrumentation Science & Dynamic Measurement, North University of china, Taiyuan 030051, China)  
In order to measure wide band pulsed-laser wavelength and direction in real time under bad environment, a method for measuring pulsed-laser wavelength and direction with grating diffraction method is proposed. By using laser coherent property, different distance between zero-order spectrum and first-order spectrum of laser with different wavelengths after interference, and different incident directions of light with different zero-order spectral positions, thus the laser wavelength and direction can be obtained by reading spectral position from the detector. An experimental optical path is designed according to the measuring principle. The optical path mainly consists of grating, cylindrical mirror and CCD. Experimental results show that the maximal error for measuring laser wavelength is 6.2nm and the maximal error for measuring incident direction is 0.6°. A real-time measurement with laser wavelength resolution 10nm and incident direction resolution 1° can be realized.
【Fund】: 国家自然科学基金项目(60378019);; 山西省科技攻关项目(20041501ZX)
【CateGory Index】: TN247
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【References】
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