MICROWAVE-DISCHARGE HgBr LAMP PUMPED TUNABLE TITANIUM SAPPHIRE LASER

通过对微波放电汞溴准分子灯及其钛掺杂蓝宝石激光器泵浦的科学研究，取得了以下成果：(1)在502 nm处获得了较强的汞溴准分子荧光，光谱宽度为16 nm。用2.45 GHz微波辐射出Ne气体和固体HgBr2的混合物。(2)获得了42.8W的光功率，其本征效率为9.4%。(3)利用开发的HgBr灯计算机模拟程序对微波泵浦的HgBr灯进行了数值模拟。(4)研制了一种带聚焦凹面反射器的微波谐振腔，将总发射光功率的50%聚焦到半径为2 cm的圆上。获得的聚焦光强为1.9W/cm~2。(5)横向泵浦钛宝石棒(FOM：200以上)，得到激光上能态的数密度为10~(-1)/cm~(-3)。通过对不同配置的聚焦系统进行测试，试图提高系统的上态数密度。结果表明，研制的40W级HgBr灯不能满足钛宝石激光器的激光振荡要求。这主要归因于这样一个事实，即使当灯由重复频率额定的微波放电时，HgBr灯也不以脉冲模式工作，而是连续工作。因此，很难在短短3.2微秒的上寿命内存储足够的上激光粒子数。(6)我们开发了HgBr灯泵浦钛蓝宝石激光器的模拟程序，模拟了激光所需的聚焦强度。

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.