The node is used as sampling flag and the beat-wave fringe fraction is measured with double frequency interferometer combined by optical components.
该装置以拍波合成的场强信号的节点为对准标志，以光路组合形成的双频激光干涉仪测量尾数部分。
2
In this paper, we describe the basic principle of polarization maintaining optical fiber and the method to measure the beat length of PM optical fiber.
本文叙述了保偏光纤能够保证传输光波偏振特性的基本原理，介绍了测量保偏光纤拍长的基本方法。
3
And tests on the laser's optical performance like wavelength, the facular quality and mode, the fluorescence signal, the beat frequency signal are carried out;