摘要
在多纵模工作状态下,腔内倍频激光器往往存在很大的倍频光输出功率噪声。通过对描述倍频激光器噪声行为的耦合微分方程组的数值模拟,发现在腔内基频光两个或者三个纵模起振的情况下,腔内基频光的损耗对于激光倍频输出的噪声存在很重要的影响。该情况下,如果基频光受到较大损耗,倍频光抖动周期变小,尖峰个数明显增多,将极大地增加倍频光功率的抖动。通过对倍频光输出功率的频谱FFT分析发现,当腔内基频光经受的损耗增大时,倍频输出功率在很大的频段范围内都存在噪声分布,输出功率的频谱FFT分布包络上面叠加的尖峰变多变密,激光器的噪声变大并趋于高频化。
When a doubled crystal is placed within a multimode solid-state laser cavity, large amplitude fluctuations （ the noise of the intracavity-frequency-doubled solid-state lasers ） are observed. Through numerical simulation of coupled differential equations which describe the noise dynamics of the intracavity-frequency-doubled laser found that the losses of fundamental longitudinal modes effect the properties of noise when two or three fundamental-frequency longitudinal modes are operated.. The periods of power fluctuations of intracavity-frequency-doubled laser are decreased and the numbers of peaks are increased if the losses are larger. Through FFT translation of power fluctuations of frequency-doubled laser, the noise will distribute at larger frequency regions and the frequency-spectrum of noise will remove to high-frequency regions.
出处
《激光与红外》
CAS
CSCD
北大核心
2008年第2期122-125,131,共5页
Laser & Infrared
基金
“863”课题基金资助项目(No.2002AA311140)
关键词
腔内倍频激光器
噪声
耦合微分方程组
FFT变换
intracavity-frequency-doubled laser
noise
coupled-differential-equations
FFT translation
作者简介
李义民（1979-），男，在读博士，主要从事非线性光学及全固态激光光学频率变换技术方面的研究。E-mail：lym79hsd@163．com
