摘要
通过了解激光功率测量的现状和发展趋势,提出一种在实验室可以使用的高精度激光功率测试方法。在LabVIEW环境下,由光调制器、低噪声光电探测器、锁相放大器、A/D数据采集卡和计算机等组成全自动快捷的测量系统。本系统将激光器发出的光调制成具有一定频率的光信号,该信号被光电探测器接收,由锁相放大器消除背景光噪声及电路噪声对测量的影响,经A/D采集卡采集到计算机,通过LabVIEW程序进行分析处理,即可获得激光器功率。噪声及误差分析表明,测量系统的信噪比可达106数量级,用此测试系统实测氦氖激光器和半导体激光器的功率,所测数据与厂家提供的参数吻合,最终实现了激光功率的准确测量。
In this paper, a high-precision laser power testing melhod used in laboratory is proposed by realizing the current situation and development tendency of laser power measurement. Under the I,abV1EW circumstances, a fully automatic and qui.k measuring system is constituted by an optical modulator, a low noise photoclectrie detector, a phase-locked amplifier, an A/D data acquisition card and a computer, etc. The light generated by the laser generator is modulated to a light signal having a certain frequency by this system. After the light signal is received by the photocleclric detector, the influence generated by background noise and cireuit noise to measurement is eliminated by tire phase-locked amplifier, and acquired to the computer by the A/D acquisition card. by the LabVIEW program, the laser power is obtained. The noise and error analysis the measurement system can reach 10＇ order of magnitude. The measurement After being analyzed and processed prove that the signal-to-noise ratio of of the power of He-Ne laser and laser by using the test system indicates that the data obtained conform to the parameters provided by ttre , which proves that test system is accurate.
出处
《实验室研究与探索》
CAS
北大核心
2013年第2期27-30,共4页
Research and Exploration In Laboratory
基金
陕西省教育厅科研计划项目资助(11JS040)
关键词
激光功率
光电探测器
锁相放大器
数据采集卡
laser power
photoelectric detector
phase-locked amplifier
data acquisition card
