文档介绍：摘要
LD 泵浦内腔倍频双频固体激光技术的研究
学科:测试计量技术及仪器
研究生:赵媛媛签名:
指导教师:焦明星教授签名:
答辩日期:2006 年 3 月
摘要
双频激光器在光波干涉测量和光学传感等领域有着广泛的应用。当以双频激光
器为光源时,为了提高测量精度,在绝对距离干涉测量系统中要求合成波长尽可能小,
即要求双频激光的频差尽可能大。与气体激光器相比,LD泵浦固体激光器(DPSSL)
具有很宽的增益带宽,已在大频差双频激光器中广泛应用。对于频差一定的双频激
光器, 应用激光倍频技术,可获得频差增大一倍的双频激光。因此, 研究LD泵浦内腔
倍频双频固体激光技术具有极其重要的意义。
本论文研究内容主要包括以下三方面:第一,应用激光四能级系统速率方程理
论,分析了LD泵浦固体激光器的工作特性,介绍了LD泵浦固体激光器的组成及设
计原理,并对LD端面泵浦Nd:YAG和 Nd:YVO4 激光技术分别进行了实验研究。第二,
在分析双折射滤光片纵模选择技术的基础上,提出了一种LD端面泵浦Nd:YAG双频
激光器研究方案,即在LD端面泵浦Nd:YAG激光器驻波腔内插入一只偏振分光棱镜
( PBS),使其与倍频晶体KTP共同构成新型双折射滤光片(PBS-KTP)以实现单
纵模选择,使1064nm基频光p分量和s分量分别在两个驻波腔中以单纵模振荡,经内
腔 KTP倍频后输出两路正交线偏振532nm绿光,再由另一只PBS合光即可实现双频绿
光输出;对该方案进行了可行性分析和初步实验研究,实现了双腔532nm绿光同时
输出。第三,在分析该方案优缺点的基础上,提出了用Nd:YVO4 晶体替代Nd:YAG
晶体的改进方案,并对这一改进方案进行了可行性分析和初步实验研究,理论分析
表明:由于Nd:YVO4 晶体偏振吸收和偏振激射的特性,要求腔内PBS的起偏方向与
线偏振基频光的振动方向成45°,有利于s分量和p分量同时振荡并具有近似相等的功
率,以实现双频激光输出;实验观察到PBS-KTP有明显的选模效果。

关键词: LD泵浦,固体激光器,双频激光,双折射滤光片,PBS
Abstract
STUDY OF LD-PUMPED INTRACAVITY FREQUENCY-DOUBLED
DUAL-FREQUENCY SOLID-STATE LASER TECHNIQUE
Subject: Measurement Technologies and Instrumentations
Candidate: Zhao Yuanyuan Signature:
Supervisor: Prof. Jiao Mingxing Signature:
Date: March 2006

Abstract
Dual-frequency laser has been used extensively in many fields such as optical interferometry and
optical sensing, etc. When dual-frequency laser is used as light source, synthetic wavelength is required
as small as possible in the absolute-distance interferometry measurement in order to improve
measurement accuracy, namely, it requires the frequency-difference as large as possible. Compared with
gas lasers, LD-pumped solid-state lasers (DPSSL) have broad gain bandwidth and have been investigated
extensively in the reaserch of large frequency-differenc dual-frequency laser. As for the certain
frequency-differenc of dual-frequency laser, using frequency doubling technique, the
frequency-differenc of dual-frequency laser can be doubled. As a result, investigating the