Design and performance of a high-average-power flashlamp-pumped Ti:Sapphire laser and amplifier
Design and performance of a high-average-power flashlamp-pumped Ti:Sapphire laser and amplifier
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高平均功率闪光灯泵浦钛宝石激光器和放大器的设计和性能
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发表时间：
1997
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通讯作者：
A. Hoffstädt
中科院分区：
文献类型：
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作者：
A. Hoffstädt
介绍了高平均功率闪光灯泵浦钛蓝宝石振荡器和放大器的设计、性能和表征。广泛的设计研究涵盖了激光器的整个激发过程，重点关注高平均功率下的高效激光运行，但也考虑了激光装置的实用性。首次研究了钛蓝宝石中泵浦光引起的吸收以及通过适当过滤避免的吸收。激光性能可以得到改善，首先，由于放电电路的正确设计，导致闪光灯发射与钛蓝宝石吸收的光谱重叠增加。其次，对闪光灯等离子体重吸收与小光谱带传输泵浦光滤波器相结合的后果的深入了解导致了一个简单的、经过实验证实的传输效率反射器模型，并在此基础上改进了反射器形状。研究结果表明，在总激光效率为 2.25% 的情况下，平均功率已达到 220 W，此外，还可以证明单程小信号增益为 3.1，激光棒在 100 Hz 重复频率下的总存储能量为 690 mJ。与以前的闪光灯泵浦钛宝石激光器和放大器相比，这一重大改进首次开启了飞秒脉冲在 100 Hz 重复率下放大到高平均功率的可能性。
Design, performance and characterization of a high average-power flashlamp-pumped Ti:sapphire oscillator and amplifier are presented. The extensive design study, which covers the whole excitation process of the laser, focused on efficient laser operation at high average powers but also took into consideration the practicability of the laser device. For the first time, pumplight-induced absorptions in Ti:sapphire and their avoidance by appropriate filtering were investigated. The laser performance could be improved, firstly, due to the proper design of the discharge circuit, which resulted in an increased spectral overlap of the flashlamp-emission with the Ti:sapphire absorption. Secondly, the insight into the consequences of the flashlamp plasma reabsorption in conjunction with a small-spectral-band-transmitting pump-light filter led to a simple, experimentally confirmed transfer-efficiency reflector model and, based on this, to an improved reflector shape. As a result of the study, average powers of up to 220 W at a total laser efficiency of 2.25% have been achieved, Also, a single-pass small-signal gain of 3.1 and a total stored energy in the laser rod of 690 mJ at 100-Hz repetition rate could be demonstrated. This significant improvement over former flashlamp-pumped Ti:sapphire lasers and amplifiers for the first time opens up the possibility of femtosecond-pulse amplification to high average powers at 100 Hz repetition rate.