权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on the Control of Thermal Birefringence in the Laser-Diode Pumped Solid-State Laser Driver

激光二极管泵浦固体激光驱动器热双折射控制研究

基本信息

批准号：
07680541
负责人：
YAMANAKA Masanobu
金额：
$ 1.47万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680541/
关键词：
Laser-Diode Pumping Solid-State Laser Nd : YAG Nd : Glass Themal Lens Thermal Birefringence 90 Degree Quartz Rotator Thermal Birefringence Compensation 90度石英施光子差分法 90度旋光子複屈折補償 Nd:ガラス Nd : ガラス Nd : YAG

项目摘要

a) An LD pumped solid state laser is expected to deliver high average laser power output with high efficiency at hight repetion rate and is a promising candidate of laser driver for an inertial fusion power plant. The key issue in the development of high power solid state laser is to reduce the thermally induced distortion of laser output. The main efforts of this study are aimed to analyze the thermal properties of LD pumped solid state laser and to develop the new techniques to compensate for the thermal effects. For these purposes, the temperature distributions in the laser system were calculated by the simulation code named STREAM,and a code to calculate the spatial distribution of thermally induced birefringence was newly developed and applied to the design of laser system.b) We performed the high-sensitivity measurements of two-dimensional (2D) thermal birefringence distribution in a laser-diode (LD) Pumped Nd : glass (HAP4) laser lasing (at 1054nm) and under no lasing conditions … More . The thermal birefringence was reduced under the lasing condition owing to the depletion of stored energy by stimulated emission. By inserting a 90 degree quartz rotator between two identical LD pumped Nd : glass rods, almost perfect birefringence compensation was achieved. The power loss due to thermal birefringence was evaluated quantitatively using the Jones matrix method. A considerable reduction of power loss, from over 12% before compensation to less than 0.4% after compensation, was observed the output performance of this laser was in fairly good agreement with the estimation after taking into account the power loss due to thermal birefringence.c) A novel laser architecture of laser-diode pumped eight pass 1064-nm Nd : YAG zig-zag slab laser amplifier was developed aming to achieve high energy extraction efficiency and good bcam quality. A high energy extraction efficiency of upto 73% for the laser mode volume has been achieved in this amplififier operating at an initial small signal gain of 3.36. The excellent beam quality factor M squared of 1.2 has been obtained. The compensation of thermal birefringence in this amplifer was successfully performed using a 90 degree quartz rotator. Less

a) LD泵浦固态激光器有望以高重复率、高效率提供高平均激光功率输出，是惯性聚变发电厂激光驱动器的有前途的候选者。高功率固体激光器发展的关键问题是减少激光输出的热致畸变。本研究的主要目的是分析LD泵浦固体激光器的热特性并开发补偿热效应的新技术。为此，通过名为 STREAM 的仿真代码计算激光系统中的温度分布，并新开发了计算热致双折射空间分布的代码并将其应用于激光系统的设计。 b) 我们对激光二极管 (LD) 泵浦 Nd: 玻璃 (HAP4) 中的二维 (2D) 热双折射分布进行了高灵敏度测量激光发射（1054nm）和无激光发射条件……更多。由于受激发射耗尽了存储的能量，在激光条件下热双折射降低。通过在两个相同的 LD 泵浦 Nd: 玻璃棒之间插入 90 度石英旋转器，实现了几乎完美的双折射补偿。使用琼斯矩阵法定量评估由热双折射引起的功率损失。功率损耗显着降低，从补偿前的 12% 以上降至补偿后的 0.4% 以下，该激光器的输出性能与考虑热双折射引起的功率损耗后的估计相当一致。c) 开发了一种新型激光二极管泵浦八通道 1064 nm Nd : YAG 之字形板条激光放大器的激光器架构，旨在实现高能量提取效率和良好的 bcam 质量。该放大器在初始小信号增益 3.36 下工作，激光模式体积的能量提取效率高达 73%。获得了优异的光束品质因数M平方1.2。使用 90 度石英旋转器成功地补偿了该放大器中的热双折射。较少的