20 January 2005 Research on special modulations combined with intensity and frequency in one LD light beam and its applications
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Abstract
During some high precision measuring, the LD light beam on frequency modulating would be carried time marks using frequency, such as FMCW test system. In this system, the frequency is shifted usually by changing the injection current of a LD. In the same time, the intensity of the laser beam must be changed. This change have no use for the test. In our experiment, the intensity change can be controlled by a modulator through electronic circuits according to a high speed response detector. This is a closed-loop control system using opti-electronic method, but not a signal clipper. Then, the laser beam can be modulated on intensity through another modulator to carry available signal in the measuring system for another testing value.
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Yanmin Li, Yanmin Li, Mengchao Li, Mengchao Li, Liujie Sun, Liujie Sun, Gang Zheng, Gang Zheng, Songlin Zhuang, Songlin Zhuang, } "Research on special modulations combined with intensity and frequency in one LD light beam and its applications", Proc. SPIE 5628, Semiconductor Lasers and Applications II, (20 January 2005); doi: 10.1117/12.576927; https://doi.org/10.1117/12.576927
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