Diffraction characteristics of chirped femtosecond laser pulse by rectangle reflection grating

作者：Liu, Guohua^*; Xu, Rongrong; Wu, Hanping; Yu, Wenbing

来源：Optics Communications, 2012, 285(13-14): 3007-3012.

DOI：10.1016/j.optcom.2012.02.093

• Chirped femtosecond laser pulse
• Spectral and temporal distribution
• Rectangle reflection grating
• Fraunhofer diffraction

The spectral and temporal intensity distribution expression for the chirped femtosecond laser pulse diffracted by a rectangle reflection grating is derived. The effects of the chirped coefficient on the spatiotemporal and spectral characteristics are theoretically investigated in detail, and a criterion for judging whether or not the diffraction pulse is just split into two independent pulses in the temporal domain is obtained. The results show that the envelope curve of spectral intensity on the diffraction axis is more blue-shift, and its full width at e(-1) maximum is wider for bigger chirped coefficient. The principal maximum on the temporal axis can split into two independent principal maximums for enough height from the upper and the nether reflection surface of the grating. Each principal maximum splits into two smooth pulses, namely one principal pulse and one secondary pulse, and the secondary pulse gradually increases with the increasing of the chirped coefficient; the duration of two principal pulses increases with the increasing of the height of the upper and the nether reflection surface of the grating.

• 出版日期2012-6-15
• 单位武汉工程大学