共查询到18条相似文献,搜索用时 140 毫秒
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为了更精确地测量飞秒脉冲特性以满足其不断拓宽的应用,基于光谱相位相干直接电场重构法(SPIDER)测量飞秒激光脉冲的基本原理和重构相位的反演算法,数值模拟了SPIDER重构飞秒脉冲相位的过程,分析了时间延迟τ、光谱剪切量Ω及滤波窗口宽度的选取原则。以宽度约为20fs的高斯型线性啁啾脉冲为例,通过选取不同的时间延迟τ和光谱剪切量Ω重构脉冲的相位,发现重构位相曲线与原输入脉冲位相曲线最接近时,时间延迟τ约为1210fs,相对光谱剪切量Ω/Δω约为9%,滤波窗口宽度约为τ/3。 相似文献
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利用瞬态光栅衍射法研制了一台单次频率分辨光学开关激光参数测量仪,可以对脉宽范围在10 ps以内的紫外超短脉冲激光进行单次测量。利用该仪器对重复频率为10 Hz的放电泵浦和单次运行的电子束泵浦KrF准分子激光器的输出脉冲分别进行了单次测量,结果表明:对于放电泵浦,当系统工作在零啁啾附近时,脉冲波形和光谱分布较规则,相位分布起伏较小,当系统偏离零啁啾状态时,脉冲波形和光谱分布不再规则,并且相位分布为抛物线结构;对于单次运行的电子束泵浦,脉冲波形具有多峰结构,光谱具有复杂的调制,脉宽约为2 ps,带宽约为1.3 nm,相位分布为抛物线结构。 相似文献
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对作者所提出的无干涉条纹直接电场重构测量飞秒脉冲的振幅和相位的新方法作出进一步理论分析,并通过实验测量说明该方法的优越性.该方法克服了传统的SPIDER方法的弊病,能得到一组无干涉条纹的图像,排除传统方法必须使用傅里叶变换滤波消除干涉条纹而引进的系统误差,使得该方法能够采用较简便设备且能较准确测量飞秒脉冲强度轮廓和相位.最后给出同一条件下新方法和传统SPIDER方法分别重构的脉冲强度自相关曲线与实验测量结果的比较,以说明新方法的有效性和优越性.
关键词:
光谱相位相干直接电场重构法
飞秒脉冲测量
超快信息光学 相似文献
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建立了一台频率分辨偏振光学开关(PG FROG)法飞秒脉冲测量装置,利用该装置对“极光Ⅱ号”飞秒激光放大系统进行了测量.在利用偏振光学开关法测得的时域和频域信号基础上,结合对信号光强度分布的计算机迭代处理,得到了有关飞秒激光电场、光谱及其相位的信息;并且对系统工作在不同状态时的激光脉冲进行了测量和比较分析,给出了有关该系统较详细的电场、光谱、相位以及啁啾状况.结果显示,当系统工作在零啁啾附近时,该系统输出的激光脉冲的电场、光谱和相位分布较规则,相位起伏较小;当系统偏离零啁啾状态时,虽然电场和光谱变化不很明显,但相位分布变化剧烈.
关键词:
频率分辨偏振光学开关(PG FROG)法
飞秒激光
自相关 相似文献
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Michelle Rhodes Günter Steinmeyer Justin Ratner Rick Trebino 《Laser \u0026amp; Photonics Reviews》2013,7(4):557-565
Multi‐shot pulse‐shape measurements of trains of ultrashort pulses with unstable pulse shapes are studied. Measurement techniques considered include spectral‐phase interferometry for direct electric‐field reconstruction (SPIDER), second harmonic generation frequency‐resolved optical gating (FROG), polarization gate FROG, and cross‐correlation FROG. An analytical calculation and simulations show that SPIDER cannot see unstable pulse‐shape components and only measures the coherent artifact. Further, the presence of this instability cannot be distinguished from benign misalignment effects in SPIDER. FROG methods yield a better, although necessarily rough, estimate of the pulse shape and also indicate instability by exhibiting disagreement between measured and retrieved traces. Only good agreement between measured and retrieved FROG traces or 100% SPIDER fringe visibility guarantees a stable pulse train. 相似文献
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We simulate multishot intensity-and-phase measurements of unstable trains of complex ultrashort pulses using second-harmonic-generation (SHG) frequency-resolved optical gating (FROG) and spectral-phase interferometry for direct electric-field reconstruction (SPIDER). Both techniques fail to see the pulse structure. But FROG yields the correct average pulse duration and suggests the instability by exhibiting significant disagreement between measured and retrieved traces. SPIDER retrieves the correct average spectral phase but significantly underestimates the average pulse duration. In short, SPIDER measures only the coherent artifact. An analytical calculation confirms this last fact. 相似文献
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S. Yeremenko A. Baltu?ka M.S. Pshenichnikov D.A. Wiersma 《Applied physics. B, Lasers and optics》2000,70(7):S109-S117
We propose a new criterion for the assessment of ultrashort pulse reconstruction quality. Our idea is based on the use of a two-dimensional Wigner representation of the electric field. This allows introducing a single measure to represent the quality of both phase and amplitude retrieval. The new criterion is employed to examine two contemporary pulse characterization techniques: FROG (Frequency Resolved Optical Gating) and SPIDER (Spectral Interferometry for Direct Electric-field Reconstruction). For SPIDER, the influence of reference pulse stretching on the quality of phase extraction is investigated. Next, we ascertain the limitations in the use of a Fabri-Perrot etalon in the SPIDER apparatus for producing delayed pulse replicas. For the FROG technique we examine the impact of the doubling crystal orientation on the quality of the amplitude-phase retrieval of sub-5-fs pulses. The introduced criterion is also applied to study the respective sensitivity of FROG and SPIDERto the limited phase-matching bandwidth of the non-linear medium and detector noise. 相似文献
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采用基于平衡光学互相关的超快激光绝对距离测量方法对大气中一段15m的空间距离进行了测量。仿真了不同脉冲宽度、不同光强损耗对平衡互相关信号的影响,理论分析表明脉宽展宽对平衡互相关信号影响较大。采用中心波长为1037nm、重复频率为260MHz的超快激光器光源,搭建了测距系统。实验验证了在脉宽分别为1.44ps、132fs时,对平衡互相关信号的影响,实验结果符合理论分析。研究了不同脉冲宽度对测量分辨力的影响,结果显示,采样时间为5ms,脉宽为1.44ps,测量分辨力不低于50μm;而当脉宽为132fs时,测量分辨力优于5μm。 相似文献
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为解决1 fJ~1 pJ脉冲激光能量的测量问题,提出了一种基于时域波形积分的飞焦级脉冲激光能量测量方法。该方法采用光电倍增管(PMT)获得飞焦级脉冲激光的响应信号,该微弱响应信号经放大、校准与激光脉冲时域波形积分后实现飞焦级脉冲激光能量测量。根据该方法设计了飞焦级脉冲激光能量测量装置,并分析了该装置的测量不确定度。实验表明,该装置实现了波长1 064 nm、脉冲宽度5 ns~1 s、能量范围1 fJ~1 pJ的脉冲激光光源的能量测量,测量不确定度为15.8%。 相似文献