超快光纤激光驱动的长波中红外飞秒脉冲光源(特邀)

Longwave mid-IR femtosecond pulse sources driven by ultrafast fiber lasers(Invited)

基于差频产生的中红外飞秒光源具有波长调谐范围宽(6~20μm)、覆盖范围广(整个"指纹区")和系统复杂程度低等优势,超快光纤激光器驱动的中红外飞秒光源只有差频部分采用了空间光路,进一步提高了系统的稳定性。文中介绍基于超快光纤激光器驱动的光学差频产生长波中红外飞秒脉冲的技术路线,阐述在差频过程中如何通过非线性光纤光学技术(包括超连续谱产生、孤子自频移和光谱滤波技术)产生合适的信号脉冲,并从理论上详细介绍差频过程中提高中红外脉冲功率的方法。

The mid-IR femtosecond sources based on difference-frequency generation exhibit many attractive features such as wide wavelength tuning range(6-20 μm), wide coverage range(the entire "fingerprint" region),and low system complexity. Ultrafast fiber laser driven mid-IR fs sources have higher system stability for using less spatial light path only in difference-frequency part. In this article, the different fiber nonlinear frequency conversion techniques in difference-frequency generation were reviewed. The methods improving mid-IR pulse power in different-frequency generation process were introduced in detail.