IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
E. I. Mareev, N. M. Asharchuk, E. O. Epifanov, F. V. Potemkin
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引用次数: 0

摘要

亚纳秒时间分辨率的时间分辨吸收光谱需要短持续时间或超短持续时间的白光光源,这种光源可以与其他激光系统同步。利用近红外飞秒激光源,在 ~450-750 nm 的光谱范围内产生了具有高光谱亮度(约 10 pJ/nm)、高脉冲间稳定性(约 2-5%)和长期(数小时)稳定性的超连续。这些超连续特性是通过在发散光束中运行实现的,发散光束可以避免多丝化,稳定光谱(波动减半和更宽的能量稳定范围),并通过改变克尔聚焦、等离子体散焦和衍射之间的动态平衡来拓宽光谱。时间分辨率是通过专门开发的基于现场可编程门阵列的电子延迟系统实现的,这使得在宽时间窗口(最多几毫秒)内实现亚纳秒时间分辨率成为可能。这项技术已在研究纳秒激光冲击下硅烧蚀动态的实验中得到成功验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Generation of a Stable Femtosecond Supercontinuum in a Divergent Laser Beam for Time-Resolved Broadband Spectroscopy of Laser-Induced Processes in Matter

Time-resolved absorption spectroscopy with subnanosecond time resolution requires sources of white light with short or ultrashort durations, which can be synchronized with other laser systems. Using a near-infrared femtosecond laser source, a supercontinuum with a high spectral brightness (~10 pJ/nm), a high pulse-to-pulse stability of about 2–5%, and a long-term (several hours) stability has been generated in the spectral range of ~450–750 nm. These supercontinuum characteristics have been achieved by operating in a divergent beam, which makes it possible to avoid multiple filamentation, to stabilize the spectrum (halving fluctuations and a wider energy stability range), and to broaden it by changing the dynamic balance between Kerr focusing, plasma defocusing, and diffraction. Time resolution has been achieved by means of a specially developed electronic delay system based on field-programmable gate arrays, which has made it possible to achieve subnanosecond time resolution in a wide time window (up to several milliseconds). This technique has been successfully tested in experiments to study the dynamics of silicon ablation under nanosecond laser impact.

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来源期刊
JETP Letters
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.
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