Through the curve of resonant wavelength versus period, we present a new method to analyze the shift of resonant wavelength of LPFG during UV laser writing without solving the coupled-mode equations.
This paper describes a measuring system basing on an optical heterodyne interferometer, which utilizes a multi-modelaser diode and coupled optical fibers to adjust the coherent length of the system.
研究了一种采用多模半导体激光与耦合光纤、采取声光调制及调节相干长度的外差干涉系统。
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The TEC single-mode fiber-coupledlaser module is used to decrease the laser beam drift, and the high accurate and stable measurement reference can be obtained.