Competition between Third-Order Nonlinear Processes in the Normal and Anomalous Dispersion Regions of Femtosecond Pump Laser Pulses Propagating in Distilled Water

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-03-05 DOI:10.1134/S0021364024604755

P. A. Danilov, Yu. S. Gulina, J. Zhu, I. D. Matyaev, P. Ya. Ilyushin, I. V. Ermolaev, A. I. Smol’skii, S. I. Kudryashov

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Abstract

The supercontinuum and third harmonic generation by focused infrared femtosecond laser pulses in distilled water in its normal and anomalous dispersion regions has been studied. Competition between the corresponding third-order nonlinearities has been detected: for pump wavelengths of 900–1200 nm (in the normal dispersion region), supercontinuum with the spectrum broadened predominantly to the blue region is generated. It has been found that 1300-nm femtosecond laser pulses propagating through the anomalous water dispersion region generate the third harmonic with the spectrum broadened to the red region. Saturation and reduction of the output of the third harmonic at a wavelength of 1300 nm with increasing pulse energy have been attributed to deterioration of phase matching as a result of ionization of the medium, which facilitates supercontinuum generation insensitive to phase matching.

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飞秒泵浦激光脉冲在蒸馏水中正常和异常色散区三阶非线性过程的竞争

研究了聚焦红外飞秒激光脉冲在蒸馏水中正常色散区和异常色散区产生的超连续统和三次谐波。已经检测到相应的三阶非线性之间的竞争：对于900 - 1200nm的泵浦波长（在正常色散区域），产生了光谱主要展宽到蓝色区域的超连续谱。研究发现，1300 nm飞秒激光脉冲通过异常水色散区产生三次谐波，其光谱展宽至红色区域。随着脉冲能量的增加，1300 nm波长处三次谐波输出的饱和和减少被归因于介质电离导致的相匹配恶化，这使得超连续统的产生对相匹配不敏感。

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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.