基于光电-电光变换的高功率激光装置时标激光系统  

Laser time fiducial system for high-power laser facility based on optic-electric and electric-optic conversion

作　　者：张波[1,2] 胡东霞 彭志涛[1] 张锐[1] 周丹丹[1] 党钊[1] 赵军普[1] Zhang Bo;Hu Dongxia;Peng Zhitao;Zhang Rui;Zhou Dandan;Dang Zhao;Zhao Junpu(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China;Graduate School of Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088

出　　处：《红外与激光工程》2023年第11期112-118,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(61605185,62075201)。

摘　　要：提出了一种时标基准信号红外长程传输结合近程光电-电光转换的时标激光系统设计方案,该方案首先使用红外单模光纤完成时间基准信号的长程传输,然后使用光电探测器将红外时标基准信号转换为电信号驱动蓝光直调LD激光器,最终获得输出波长为450 nm,输出功率47 mW,脉冲宽度为120 ps的时标光信号。实验结果表明,所提方案可为激光驱动器提供窄脉宽,可长程传输的时标光信号用于甚多束紫外激光脉冲同步同发监测,同步监测精度可达10 ps。文中技术方案规避了敏感的固体激光放大与倍频过程,提高了时标光脉冲波形的稳定度与同步监测系统的可靠性。Objective Laser time fiducial system is needed in high power laser facility for tracking synchronization change in experiment caused by disturbances such as collimation and device replacement.Traditional time fiducial is an electrical trigger pulse input to the AUX channel of oscilloscope which is convenient but has obvious jitter(about150 ps).Moreover,the electrical trigger sensitive to the electromagnetic interference.Another time fiducial form is an infrared fiducial can transfer a long distance in fiber and been send to an independent channel of oscilloscope.Infrared fiducial has a good accuracy but employ a measurement channel.In this article,we propose a new time fiducial scheme based on optic-electric and electric-optic transformation for getting a blue time fiducial signal@450 nm which can use the vacuum photodiode detecting together with UV pulse.The scheme provides a rapid fiducial signal with long transmission ability for UV pulse synchronization monitor and has a monitoring precision as high as 10 ps.Methods The study presents a fiducial system scheme based on optic-electric and electric-optic conversion.Firstly,arbitrarily waveform generator driven a M-Z modulator to modulate continuous infrared laser and infrared time fiducial signal been produced.Secondly,infrared time fiducial transferred a long distance by SM fiber and been converted to electrical signal by a photodiode.Thirdly,the electrical signal drive a direct-modulation LD and a blue time fiducial signal@450 nm is gotten.The final fiducial signal can be reach an index of 47 mW output power,10%power jitter and 120 ps laser pulse width.Results and Discussions According to the scheme,the monitor jitter caused by fiducial power jitter,fiber length variation follow with temperature,oscilloscope noise and photodiode noise have been tested and analyzed.According to the analysis,the scheme can get a monitor accuracy of 10 ps with a 24.5-25.5℃temperature variation.An experiment for examine monitor accuracy is done with 24.8-25.2℃temperature varia

关 键 词：光电-电光转换 同步监测 直接调制 LD激光器 

分 类 号：TN248[电子电信—物理电子学]