Single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse

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	Single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse
其他题名	Single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse
	QIAN, LIEJIA; MA, JINGUI; YUAN, PENG; WANG, YONGZHI; ZHANG, DONGFANG; ZHU, HEYUAN
	2012-09-13
专利权人	FUDAN UNIVERSITY
公开日期	2012-09-13
授权国家	美国
专利类型	发明申请
摘要	A single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse includes a long-wavelength sampling light generation unit, a large-angle non-collinear sum-frequency cross-correlation unit and a high sensitivity signal receiving unit. The long-wavelength sampling light sum-frequency cross-correlator can allow that the beams are interacted with each other at the large non-collinear angle in the quasi-phase matching crystal, match the measuring window of the high sensitivity signal receiving system, and is in favor of eliminating the scattered light noise, thereby achieving the single measurement of the pulse contrast with large temporal window and high dynamic range. The single-shot pulse contrast measuring device of the present invention has good extensibility at the temporal window and dynamic range, and is adapted for measuring the contrast of the high-power laser with various wavelengths.
其他摘要	一种基于非谐波长波采样脉冲的单发脉冲对比度测量装置，包括长波长采样光产生单元，大角度非共线和频互相关单元和高灵敏度信号接收单元。长波长采样光和频交叉相关器可以使光束在准相位匹配晶体中以大的非共线角度相互作用，与高灵敏度信号接收系统的测量窗口相匹配，并且有利于消除散射光噪声，从而实现具有大时间窗和高动态范围的脉冲对比度的单次测量。本发明的单发脉冲对比度测量装置在时间窗和动态范围具有良好的可扩展性，适用于测量各种波长的高功率激光的对比度。
主权项	A single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse, comprising: a long-wavelength sampling light generation unit, comprising an optical parametric generation-optical parametric amplification (OPG-OPA) system, a time delayer, an optical filter and two beam compressors, wherein a laser pulse under test is compressed via said beam compressors and a time delay of said laser pulse under test is adjusted via said time delayer, and then said OPG-OPA system is pumped, thereby generating a designed cleaner mid-infrared long-wavelength sampling light than said pulse under test; a large-angle non-collinear sum-frequency cross-correlation unit, comprising a periodically polarized non-linear crystal, a periscope, two beam expanders and two plano-concave cylindrical lenses, wherein a polarization direction of said laser pulse under test is rotated to a polarization direction of said long-wavelength sampling light through said periscope, three interacting pulses can all be e-polarized for said quasi-phase-matching non-linear crystal, and then said laser pulse under test and said long-wavelength sampling light are expanded by said two beam expanders, respectively, and then are one-dimensionally focused to said non-linear crystal by said two plano-concave cylindrical lenses, respectively, and then said laser pulse under test and said long-wavelength sampling light make a sum-frequency cross-correlation function at a non-collinear angle of 30°-40° in said non-linear crystal, thereby obtaining corresponding spatially distributed sum-frequency cross-correlation signals, wherein said non-linear crystal is a periodically polarized lithium niobate (PPLN) crystal disposed along a horizontal direction; and a high sensitivity signal receiving unit, comprising a fiber array, a high-sensitive fast-response photomultiplier (PMT), a filter, a neutral attenuator and three plano-convex cylindrical lenses, wherein said fiber array comprises 64-128 optical fibers with increasing lengths from one end of said array to the other, a length difference between adjacent fibers is determined by a response time of said PMT, according to different signal magnitude of every channel, optical attenuators with different attenuation level are added, wherein said spatially distributed SFG correlation signals turn to be a series of time-delayed pulses via said fiber array, and then after spectral filtering, said pulses are received and changed into electric signals by said PMT.
申请日期	2012-02-14
专利号	US20120228501A1
专利状态	授权
申请号	US13/372505
公开（公告）号	US20120228501A1
IPC 分类号	G01J5/08
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/62544
专题	半导体激光器专利数据库
作者单位	FUDAN UNIVERSITY
推荐引用方式 GB/T 7714	QIAN, LIEJIA,MA, JINGUI,YUAN, PENG,et al. Single-shot pulse contrast measuring device based on non-harmonic long-wavelength sampling pulse. US20120228501A1[P]. 2012-09-13.