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MICROWAVE-DISCHARGE HgBr LAMP PUMPED TUNABLE TITANIUM SAPPHIRE LASER

微波放电溴化汞灯泵浦可调谐钛蓝宝石激光器

基本信息

批准号：
06555017
负责人：
OBARA Minoru
金额：
$ 3.52万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555017/
关键词：
Titanium Sapphire Laser Excimer Lamp Microwave Discharge Laser レーザー

项目摘要

By developmental scientific research of microwave discharged HgBr excimer lamp and its lamp pumping of titanium doped sapphire laser, the following results are achieved :(1) Intense HgBr excimer fluorescence was obtained at 502 nm with spectral width of 16nm. The mixture of neon gas and solid HgBr_2 is discharged by 2.45 GHz microwave.(2) The optical power obtained is 42.8 W at an intrinsic efficiency of 9.4%.(3) The microwave pumped HgBr excimer lamp is numerically simulated by the developed computer simulation code of HgBr lamp.(4) We developed a microwave resonant cavity with focusing concave reflector, by which 50% of the total emitted optical power is focused into the circle which a radius of 2 cm. The focused intensity obtained is 1.9 W/cm^2.(5) The number density of the upper laser state is estimated to be 10^<12>/cm^3 by transversely pumping a titanium sapphire rod (FOM : over 200). By testing various configurations of focusing system we tried to enhance the upper state number density. As a result, the developed 40 W class HgBr lamp is not sufficient for laser oscillation of titanium sapphire laser. This is mainly attributed to the fact that the HgBr lamp is operated not in pulsed mode but continuously even when the lamp is discharged by a repetition rated microwave. Therefore, it is difficult to store the sufficient upper laser population within a short upper lifetime of 3.2 mus.(6) We developed a simuration code of HgBr lamp pumped titanium sapphire laser and simulated the focusing intensity required for lasing.

通过对微波放电HgBr准分子灯及其灯泵浦掺钛蓝宝石激光器的研究，取得了如下成果：（1）获得了强的HgBr准分子荧光，波长为502 nm，谱宽为16 nm。用2.45GHz微波对氖气和固体HgBr_2的混合气体进行放电。(2)在本征效率为9.4%时，获得的光功率为42.8 W。(3)利用开发的HgBr灯计算机模拟程序对微波泵浦HgBr准分子灯进行了数值模拟。(4)我们研制了一种带聚焦凹面反射镜的微波谐振腔，它将总发射光功率的50%聚焦到半径为2cm的圆上。获得的聚焦强度为1.9 W/cm^2。(5)通过<12>横向泵浦钛蓝宝石棒（FOM：超过200），估计上激光态的数密度为10^ /cm ^3。通过测试不同的聚焦系统结构，我们试图提高上态数密度。结果，所开发的40 W级HgBr灯不足以用于钛蓝宝石激光器的激光振荡。这主要归因于这样的事实，即HgBr灯不是以脉冲模式操作，而是连续地操作，即使当灯由重复额定微波放电时。因此，难以在3.2 μ s的短的上寿命内存储足够的上激光器群。(6)开发了一个模拟程序，模拟了HgBr灯泵浦钛蓝宝石激光器产生激光所需的聚焦强度。