FENG Yong,ZHANG Wen-xi,WU Zhou,et al.Short coherent light source based on current modulation in semiconductor lasers[J].Optics and Precision Engineering,
FENG Yong,ZHANG Wen-xi,WU Zhou,et al.Short coherent light source based on current modulation in semiconductor lasers[J].Optics and Precision Engineering,DOI:10.37188/OPE..0001
Short coherent light source based on current modulation in semiconductor lasers
Traditional interferometers use laser light source, because of the high coherence of laser, there are serious crosstalk in the measurement of parallel plate, prism and other special optical elements.Due to the characteristics of poor collimation, poor stability of light intensity and short coherence length, LED and tungsten lamps are also not suitable for the detection of interferometers with special optical elements. Short-coherent laser source has the advantages of good directivity, high brightness and moderate coherence length, and is an ideal source for detecting interferometers with special components.In order to meet the demand of short coherence interferometer, the coherence of current modulated semiconductor laser source is studied theoretically,the results show that the higher the modulation frequency and the greater the modulation intensity, the shorter the coherence length of the light source.The larger the bias current is, the higher the output power is, but the coherence will also be better, which is not conducive to the generation of short coherent light source. On this basis, a short coherent light source verification system is built to verify the correctness of the relevant theories.A short coherent laser source has been developed,the coherence length of the light source is 80μm, the sidelobe rejection ratio of the light source decreased to 0.31, the output power of the light source can reach 30mW, which can meet the requirements of short coherent measurement.
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