飞秒钛宝石激光器的工作原理研究

The Principle of Femtosecond Ti:Sapphire Laser

飞秒激光是一种持续时间极短(10-15s),峰值功率高的以脉冲形式运转的激光。它不仅能使人们获得超短时间的分辨能力,同时,由于它的高峰值功率,使它在各个领域都得到了广泛的应用。飞秒钛宝石激光器包括飞秒激光振荡器和飞秒激光放大器两部分,是目前能产生飞秒量级脉冲的应用最广泛的激光器。它通过钛宝石的自锁模原理,并采用世界上先进的啁啾脉冲放大(CPA)技术,已能直接产生零点几个飞秒、峰值功率达太瓦量级的激光脉冲。文章从钛宝石晶体的增益特性、自锁模原理、色散及色散补偿、脉冲的展宽与压缩、再生放大器等方面,对飞秒钛宝石激光振荡器和放大器的工作原理做详细的阐述。

The femtosecond laser is an ultrashort （10-15s） laser with high peak power. Since many applications need high power and have ultrafast character, the femtosecond laser is widely used in scientific research and many other fields. The Ti：sapphire laser involves two systems, one is the Ti：sapphire oscillator, and the other is Ti：sapphire amplifier. It is wildly used to produce ultrashort pulse. By using the self-locked-mode of Ti：sapphire technique and the developed Chirped-Pulse-Amplification technique, the femtosecond laser can produce pulse with ultrashort and high peak power.In this paper, the principle of the generation and amplification in femtosecond Ti：sapphire laser are demonstrated.