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Fundamental studies on the laser diode pumped solid-state laser driver

激光二极管泵浦固体激光驱动器的基础研究

基本信息

批准号：
05680431
负责人：
YAMANAKA Masanobu
金额：
$ 1.02万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05680431/
关键词：
Laser fusion Laser diode LD pumped solid-state laser Solid-state laser Driver Fusion Reactor Yb : glass Nd : glass 半導体レーザー励起固体レーザー固体レーザー

项目摘要

Technical and economical feasibility of a laser diode (LD) pumped solid-state laser driver for the fusion reactor is examined, Nd-doped solid-state laser materials with lasing wavelength at 1mum are serected. Using a conceptual designing technique, a prototype-model driver is designed, which has the specifications for a reactor driver such as an output energy of 4MJ per pulse at the wavelegth of 0.35mum, overall efficiency of 12% and a repetition rate of 12Hz.According to a small scale experiment of an LD pumped Nd : YAG laser system, it is shown that the Lowdermilk and Murray theory can be used as a guide line when a high-energy high-efficiency laser driver.An efficient LD array surface pumped Nd : YAG disk amplifier with an optical-optical conversion efficiency of 12% is demonstrated. Tow -dimensional thermal stress-induced birefingence in the disk amplifier is successfully measured using a newly designed polarimeter. An energy extraction efficiency of 65% is obtained which is well fitted to the Frantz-Nodvik equations taking into account of the thermal birefringent loss.To measure the fluorescence lifetime of Yb lasant, a widely tunable (750-1040nm) all-solid-state KTP parametric converter featuring low pump energy threshold (0.4mJ for the 532nm, 8ns, 50Hz input) and high conversion efficiency (27%) is realized.

研究了激光二极管（LD）泵浦的聚变堆固体激光器驱动器的技术和经济可行性，选择了激光波长为1 μ m的掺钕固体激光材料。利用概念设计技术，设计了一个原型驱动器，其性能指标达到了反应堆驱动器的要求：在0.35 μ m波长下，单脉冲输出能量为4 MJ，总效率为12%，重复频率为12 Hz。YAG激光器系统的实验结果表明，Lowdermilk和Murray理论可以作为高能量高效率激光驱动器的指导原则。研制了光-光转换效率为12%的YAG圆盘放大器。利用新设计的偏振计成功地测量了盘放大器中的二维热应力双折射。在考虑热双折射损耗的情况下，能量提取效率可达65%，符合Frantz-Nodvik方程。（750- 1040 nm）低泵浦能量阈值的全固态KTP参量转换器在532 nm、8 ns、50 Hz输入时，输出能量为0.4mJ，转换效率高达27%。