Small signal gain and loss measurement of a CW Nd:YAG laser using an antiresonant ring interferometer

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2012,（6）
• 页码范围: 54-57
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201210.061405

摘要

An antiresonant ring (ARR) interferometer configuration is introduced for the characterization of a continuous wave (CW) Nd:YAG laser output.The output of the ARR device is precisely characterized to determine the gain and loss of a laboratory CW Nd:YAG laser by using the Findlay-Clay approach.The ARR arm is then experimentally arranged inside the cavity of an arranged high power side-pumped CW Nd:YAG laser.A coated beam splitter with 50 50％ reflectivity at normal incidence is placed inside the cavity to provide a wide range of reflectivity from 0 to 100％.This is performed by a rotatable stage and tilting the beam splitter by 10° with the steps of 0.05.By changing the input electrical power of the laser pump the variation of the output laser power is monitored for 20 individual reflectivity of ARR arm.Average pump threshold power of about 180 W is obtained.With the help of the derived equations and obtained threshold power,small signal gain and loss associated with the emerging beam is estimated.It is verified that the former is very dependent to the input parameters.Laser efficiency is also measures 5.6％which is quite comparable with the reported values.