Investigation of the dynamics of a versatile laser amplifier upon fast modulation of its CW and pulsed seed sources

IF 1.8 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2026-02-05 DOI:10.1007/s00340-026-08632-1

Christian Schmittner, Colin Reiff, Max Hoßfeld, Thomas Graf, Marwan Abdou Ahmed

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Abstract

This paper presents an investigation of the dynamics of a versatile thin-disk multipass laser amplifier (TDMPA) with two seed sources. The study focused on the system’s transient response, analyzing the amplified instantaneous power during and shortly after fast modulation of the individual seed powers. For switching times shorter than the amplifier’s characteristic response time, changes in the total seed power led to retardation and overshooting effects, which are attributed to the gain-saturation dynamics of the active laser medium. An analytical formula to express the dependence of the characteristic response time on the input and output powers and the specific TDMPA architecture was derived and validated. This provides a practical guideline for choosing seed-power switching times that avoid transient overshooting and retardation effects. For pump powers between 599 and 1446 W, and depending on operation conditions, the TDMPA under consideration was measured to exhibit a gain-saturation response time ranging between approximately 30 and 90 µs.

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多用途激光放大器在快速调制连续波和脉冲种子源时的动力学研究

本文研究了具有两个种子源的多功能薄盘多通激光放大器（TDMPA）的动力学。研究的重点是系统的瞬态响应，分析了单个种子功率快速调制期间和调制后短时间内瞬时功率的放大。当开关时间小于放大器的特性响应时间时，总种子功率的变化会导致延迟和超调效应，这是由主动激光介质的增益饱和动力学引起的。推导并验证了特征响应时间与输入输出功率和特定TDMPA结构关系的解析公式。这为选择避免瞬态超调和延迟效应的种子功率开关时间提供了实用的指导。当泵功率在599至1446 W之间时，根据运行条件，测量所考虑的TDMPA时，其增益饱和响应时间范围约为30至90µs。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.