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在 8 0 0nm飞秒脉冲激光照射下光敏玻璃As2 S3光纤具有双光子吸收现象 ,当一束超短激光脉冲与另一束啁啾超短激光脉冲在As2 S3光纤相遇时 ,干涉图案将永久地记录一个空间啁啾光栅 .研究了该光栅结构与入射超短脉冲激光脉冲参数的关系 ,数值计算表明该光栅具有较大的Bragg反射带宽 .
Photonic glass As2 S3 fiber has the phenomenon of two-photon absorption under the irradiation of 800 nm femtosecond laser pulse. When one ultrashort laser pulse and another short-pulse chirped pulse meet on As2 S3 fiber, the interference pattern will be permanently A space chirped grating was recorded.The relationship between the grating structure and the pulse parameters of the incident ultrashort pulse laser was studied.The numerical results show that the grating has a large Bragg reflection bandwidth.