1030nm超短激光脉冲在聚甲基丙烯酸甲酯中的非线性吸收

IF 1.3 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-08-19 DOI:10.1134/S0021364025607055

Yu. S. Gulina, J. Zhu, A. V. Gorevoy, N. I. Dolzhenko, P. A. Danilov, E. N. Rimskaya, S. I. Kudryashov

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引用次数: 0

摘要

利用优化的z扫描技术研究了波长为1030nm的250-fs激光脉冲与聚甲基丙烯酸甲酯的非线性相互作用。结果表明，峰值强度低于0.65 TW/cm2的脉冲衰减机制可以描述为四光子吸收，其系数为β4 =(35±5)cm5/TW3。测定了非线性折射率n2 =（7.6±0.4）× 10−4 cm2/TW和自聚焦起始临界功率Pcr =(1.42±0.08)MW，这些结果证明了计算的非线性焦点位移与激光修饰区位置之间的对应关系。

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Nonlinear Absorption of 1030-nm Ultrashort Laser Pulses in Polymethyl Methacrylate

The nonlinear interaction of 250-fs laser pulses at a wavelength of 1030 nm with polymethyl methacrylate is investigated using an optimized z-scan technique. It is shown that the mechanism of pulse attenuation for peak intensities below 0.65 TW/cm² can be described as four-photon absorption with the coefficient β₄ = (35 ± 5) cm⁵/TW³. The nonlinear refractive index n₂ = (7.6 ± 0.4) × 10⁻⁴ cm²/TW and the critical power for the onset of self-focusing P_cr = (1.42 ± 0.08) MW are determined and these results are used to demonstrate the correspondence between the calculated shift of the nonlinear focal point and the location of the laser-modified regions.

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.