Theory of Chirped Fiber Gratings Written by Femtosecond Laser Pulses
飞秒脉冲制作啁啾光纤光栅的理论研究

An innovative way of making chirped fiber gratings is proposed by interference of two femtosecond laser pulses. One of pulses is frequency-chirped and the other is chirp-free. The relationship between the structure of the fiber grating and the chirp parameters is studied. The reflective characters of the gratings is also given. This is important for the fabrication of new kind of stretcher.