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啁啾体布拉格光栅的脉冲响应特性

Impulse Response Characteristics of Chirped Volume Bragg Gratings

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摘要

高功率飞秒(fs)脉冲光纤激光器以其脉宽短、峰值功率高的特点,并结合光纤结构损耗低、结构紧凑、稳定性好的优势,被广泛应用于激光冷加工[1]。光纤啁啾脉冲放大(FCPA)是当前研制高功率超短脉冲光纤激光系统的主流和关键技术[2-5],其最终输出主要取决于最后一级的脉冲压缩器件。现常用于啁啾脉冲放大(CPA)系统中压缩脉冲的器件,衍射光栅对[6-8]和色散镜组[7-10]虽然可以提供足够大的带宽、效率和抗损伤阈值,但它们占用空间大且对光路极为敏感,因而并不适用于对系统尺寸和环境稳定性有着高要求的工业级高功率飞秒光纤激光器。相比之下,啁啾体布拉格光栅(CVBG)[11]尺寸小巧、环境稳定性好,且可以单片集成在光路里,能同时实现脉冲的展宽与压缩,因此被广泛地作为脉冲压缩器应用到FCPA系统中[12-15]。

Abstract

In this work, the frequency domain and time domain response analysis model of ultrashort pulses via chirped volume Bragg grating (CVBG) is constructed based on the matrix method. Aiming at the bandwidth requirement of CVBG for the hundred-femtosecond (fs) fiber chirped pulse amplification (FCPA) system, we systematically study the influence of the diffraction bandwidth on the pulse stretching and compression effect of CVBG and the impulse response characteristics of the broadband CVBG to incident pulse with different chirp parameters. The results show that the diffraction bandwidth of CVBG increases linearly with the increasing chirp rate and thickness. When the diffraction bandwidth of CVBG is smaller than that of the incident pulse, the shearing of the spectral components will cause distortion of the stretched pulse and broadening of the compressed pulse with respect to the incident pulse. To achieve stretching-compression reciprocity of the one-hundred-femtosecond pulse, it is necessary to ensure the diffraction bandwidth of CVBG no less than 60 nm. As designed, a broadband CVBG with 40 mm thickness is stretched first and then compressed, and linear chirp pulses with a spectral width of 16.64 nm are obtained. All of the output pulses are infinitely close to the Fourier transform constrained (FTL) pulse and the diffraction efficiency is as high as 84%, which provides a theoretical reference for the implementation of the fs CVBG pulse compressor.

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DOI:10.3788/AOS201939.1005002

所属栏目:衍射与光栅

基金项目:国家自然科学基金、上海市科学技术委员会;

收稿日期:2019-05-15

修改稿日期:2019-06-25

网络出版日期:2019-10-01

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戴慧芳:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院强激光材料重点实验室, 上海 201800
陈鹏:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院强激光材料重点实验室, 上海 201800
赵靖寅:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院强激光材料重点实验室, 上海 201800
孙勇:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院强激光材料重点实验室, 上海 201800
徐姣:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院大学材料与光电研究中心, 北京 100049中国科学院强激光材料重点实验室, 上海 201800
孔钒宇:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院强激光材料重点实验室, 上海 201800
晋云霞:中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800中国科学院强激光材料重点实验室, 上海 201800

联系人作者:晋云霞(yxjin@siom.ac.cn)

备注:国家自然科学基金、上海市科学技术委员会;

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引用该论文

Huifang Dai,Peng Chen,Jingyin Zhao,Yong Sun,Jiao Xu,Fanyu Kong,Yunxia Jin. Impulse Response Characteristics of Chirped Volume Bragg Gratings[J]. Acta Optica Sinica, 2019, 39(10): 1005002

戴慧芳,陈鹏,赵靖寅,孙勇,徐姣,孔钒宇,晋云霞. 啁啾体布拉格光栅的脉冲响应特性[J]. 光学学报, 2019, 39(10): 1005002

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