宽带扩展腔产生15飞秒光脉冲实验研究

Generation of 15 Femtosecond Ti∶Sapphire Pulse

用３ｍｍ长的钛宝石短棒和改进的非对称Ｚ型折叠腔结构进行自锁模实验，以石英棱镜对作为腔内色散补偿元件，在５Ｗ氩离子激光泵浦下，实现低阈值泵浦自锁模运转。在腔内不加任何调制元件的情况下实现软光阑锁模，获得最短脉冲宽度为１５ｆｓ，光谱宽度为８０ｎｍ，输出平均功率４００ｍＷ。

Making self mode locking experiment using the 3 mm Ti∶sapphire short rod and the improved asymmetric Z shape folding configuration, with quartz prisms as dispersion compensation element, we achieve low threshold self mode locking operation with 5 W pumping power of Argon laser and soft aperture mode Locking without any modulating element. The pulse duration is 15 fs with 80 nm spectrum bandwidth. The 400 mW average power is obtained.