基于BBO晶体的电光取样探测技术在近红外少周期激光脉冲探测中的应用  

Application of Electro-Optic Sampling Detection Technology Based on BBO Crystals in Detecting Near-Infrared Few-Cycle Laser Pulses

作　　者：王婧仪 李强爽 孙长明 杜海伟 Wang Jingyi;Li Qiangshuang;Sun Changming;Du Haiwei(College of Measuring and Optical Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;Key Laboratory of Nondestructive Testing(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]南昌航空大学测试与光电工程学院,江西南昌330063 [2]南昌航空大学无损检测技术教育部重点实验室,江西南昌330063

出　　处：《激光与光电子学进展》2024年第13期312-318,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(12064028);江西省自然科学基金(20232BAB201045);南昌航空大学无损检测技术教育部重点实验开放基金(EW202108218);南昌航空大学研究生创新专项基金(校级项目)(YC2023-040)。

摘　　要：基于数值计算研究了β相偏硼酸钡(即β-BaB_(2)O_(4),BBO)晶体在近红外波段的电光取样探测技术的频率响应,分析了基于不同厚度的BBO晶体电光取样探测技术探测近红外少周期激光脉冲过程中引起的脉冲畸变,包括中心频率的频移和带宽的变化,并给出0.9~2.1μm范围内激光脉冲带宽改变量和中心波长改变量与晶体厚度的具体关系。结果表明,当晶体厚度为10μm时经电光取样探测的少周期激光脉冲的带宽和中心波长改变量均在0.1%以内;增大晶体厚度,则二者改变量增大;当晶体厚度为200μm时,探测的带宽变窄20%,中心波长改变量在6%以内。本文结果可以为扩展电光取样探测技术到近红外波段提供理论参考,也为强场物理中少周期激光脉冲的探测和定标提供一定的帮助。The frequency response of electrooptic sampling with aβbarium metaborate(βBaB_(2)O_(4),BBO)crystal in the nearinfrared band was investigated based on numerical calculations.The detection performance of the electrooptic sampling in the measurement of a nearinfrared fewcycle laser pulse was also analyzed.The study then examined the pulse distortion of a fewcycle laser pulse resulting from detection under different thicknesses of BBO crystals,while also considering the central frequency shift and change in bandwidth.The changes in bandwidth and central wavelength based on the BBO thickness levels were given with laser wavelengths in the range of 0.9μm to 2.1μm.The results show that these changes are less than 0.1%when the BBO is 10μm.They then increase when the BBO thickens.When the BBO is 200μm,the observed change in bandwidth is 20%,and the shift in the central wavelength is 6%.This study provides a theoretical reference for extending electrooptical sampling detection technology to the nearinfrared band and provides guidelines in detecting and calibrating fewcycle laser pulses in the area of highfield physics.

关 键 词：电光取样 β-BaB_(2)O_(4)晶体 近红外 少周期激光脉冲 

分 类 号：O434.3[机械工程—光学工程]