绝对重力仪激光器光纤对准调节方法概述

Overview of the Adjustment Method of Laser Fiber Alignment for Absolute Gravimeter

绝对重力仪激光器光纤由于应力变化、形状改变、震动或耦合器维护等原因破坏了输出激光的偏振态,使其在光纤内的传输变得非常不稳定,导致光纤输出激光的消光比值小于100,无法满足绝对重力观测条件。针对该问题,介绍了光纤对准调节的方法,通过设计消光比检测装置检验消光比值是否大于100。对#181和#250两台WEO100型He-Ne激光器的光纤进行对准调节实验,并通过消光比检测装置实测,两台激光器输出的光束消光比值满足绝对重力测量的条件,表明该对准调节方法科学有效。

The fiber of absolute gravimeter laser is easily deflected around the optical axis,due to stress,shape change,vibration or coupler maintenance,etc.The polarization state of the output laser is destroyed,making its transmission in the optical fiber very unstable,resulting in an optical fiber output laser extinction ratio of less than 100,which cannot meet the absolute gravimeter observation conditions.This paper introduces a method of adjusting the optical fiber alignment,and the extinction ratio detection device is designed to check whether the extinction ratio is greater than 100.Alignment adjustment experiments are carried out on the optical fibers of the two WEO100 He-Ne lasers#181 and#250,and we meet the absolute gravimeter measurement conditions by measuring the beam extinction ratio of the output of the two lasers by the extinction ratio detection device.The research shows that the alignment adjustment method is scientific and effective.