Time-resolved analysis of ASE impact in a copper bromide MOPA system

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-08-26 DOI:10.1007/s00340-025-08543-7

Maxim V. Trigub, Nikolai A. Vasnev

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Abstract

This study investigates the influence of amplified spontaneous emission (ASE) on the output characteristics of a Master Oscillator Power Amplifier (MOPA) system, with particular attention to the temporal dependence of the signal-to-noise ratio (SNR). The time delay between the ASE generated in the power amplifier and the laser pulse emitted by the master oscillator was varied over a wide range, from − 36 to + 24 ns. A positive delay corresponds to the input signal entering the amplifier before the onset of ASE. Temporal profiles of the ASE, the input pulse, and the amplified output signal were recorded and analyzed. The results demonstrate that the temporal alignment of the input signal with the leading edge of the ASE critically affects the output power and the efficiency of population inversion utilization. The maximum output power of 3.87 watts was achieved at a time delay of plus 4.7 ns, when the peak of the input pulse coincided with the ASE front. Quantitative estimates of the ASE contribution to the output signal were obtained, enabling an assessment of the SNR under various timing conditions. These findings provide practical recommendations for optimizing synchronization in MOPA-based laser systems to maximize output contrast and minimize noise.

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溴化铜MOPA系统中ASE影响的时间分辨分析

本研究探讨了放大自发发射（ASE）对主振荡器功率放大器（MOPA）系统输出特性的影响，特别关注了信噪比（SNR）的时间依赖性。功率放大器中产生的ASE与主振荡器发射的激光脉冲之间的时间延迟在−36到+ 24 ns之间变化很大。正延迟对应于在ASE开始之前进入放大器的输入信号。记录并分析了ASE、输入脉冲和放大后的输出信号的时间分布。结果表明，输入信号与ASE前沿的时间对准严重影响输出功率和人口反演利用效率。当输入脉冲峰值与ASE前端重合时，延时为+ 4.7 ns，最大输出功率为3.87瓦。获得了ASE对输出信号贡献的定量估计，从而能够评估各种时序条件下的信噪比。这些发现为优化基于mopa的激光系统的同步提供了实用的建议，以最大化输出对比度和最小化噪声。

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.