确定激光脉冲持续时间的强度自相关全局模型

IF 1.5 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Yufei Peng, Liqiang Liu, Lihong Hong, Zhiyuan Li
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引用次数: 0

摘要

我们提出了一种基于二次谐波生成非线性的新的共线自相关全局模型。该模型由自相关测量配置特有的非线性耦合波方程严格推导得出,无需入射脉冲函数的特定形式。在时域中获得了非线性耦合波方程的严格解法,并以一般分析形式表达出来。全局模型充分考虑了非线性晶体内部的非线性相互作用和传播效应,而经典的局部模型则无法捕捉到这些效应。为了评估全局模型与经典局部模型相比的性能,我们研究了两种模型在不同入射脉冲波形和不同全宽半极大值(FWHM)条件下获得的自相关信号。当入射脉冲波形为全宽半极大值为 200fs 的洛伦兹波形时,全局模型预测的自相关信号全宽半极大值为 399.9fs,而经典局部模型预测的全宽半极大值为 331.4fs。两个模型之间的差异为 68.6fs,相当于 17.2% 的误差。同样,对于 FWHM 为 200fs 的 sech 型入射脉冲,全局模型预测自相关信号的 FWHM 为 343.9fs,而局部模型预测的 FWHM 为 308.8fs。两个模型之间的差异为 35.1fs,误差为 10.2%。我们进一步研究了洛伦兹脉冲模型在 100fs、200fs 和 500fs 下的表现。全局模型和局部模型的差异分别为 17.1fs、68.6fs 和 86.0fs,误差约为 17%。这些对比分析清楚地表明,全局模式在强度自相关建模方面具有更高的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A global model of intensity autocorrelation to determine laser pulse duration
We present a new global model of collinear autocorrelation based on second harmonic generation nonlinearity. The model is rigorously derived from the nonlinear coupled wave equation specific to the autocorrelation measurement configuration, without requiring a specific form of the incident pulse function. A rigorous solution of the nonlinear coupled wave equation is obtained in the time domain and expressed in a general analytical form. The global model fully accounts for the nonlinear interaction and propagation effects within nonlinear crystals, which are not captured by the classical local model. To assess the performance of the global model compared to the classic local model, we investigate the autocorrelation signals obtained from both models for different incident pulse waveforms and different full-width half-maximums (FWHM). When the incident pulse waveform is Lorentzian with a FWHM of 200fs, the global model predicts an autocorrelation signal FWHM of 399.9fs, while the classic local model predicts a FWHM of 331.4fs. The difference between the two models is 68.6fs, corresponding to an error of 17.2%. Similarly, for a sech-type incident pulse with a FWHM of 200fs, the global model predicts an autocorrelation signal FWHM of 343.9fs, while the local model predicts a FWHM of 308.8fs. The difference between the two models is 35.1fs, with an error of 10.2%. We further examine the behavior of the models for Lorentzian pulses with FWHMs of 100fs, 200fs, and 500fs. The differences between the global and local models are 17.1fs, 68.6fs, and 86.0fs, respectively, with errors approximately around 17%. These comparative analyses clearly demonstrate the superior accuracy of the global model in intensity autocorrelation modeling.
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来源期刊
Chinese Physics B
Chinese Physics B 物理-物理:综合
CiteScore
2.80
自引率
23.50%
发文量
15667
审稿时长
2.4 months
期刊介绍: Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.
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