High-efficiency Yb:YAG thin-disk chirped pulse amplifier delivering 884-femtosecond laser with tunable repetition rates and high stability

IF 3.1 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Infrared Physics & Technology Pub Date : 2024-09-30 DOI:10.1016/j.infrared.2024.105574

Sizhi Xu , Yubo Gao , Xing Liu , Zuoyuan Ou , Fayyaz Javed , Xiaoyang Guo , Di Lin , Xingyu He , Haotian Lu , Junzhan Chen , Chunyu Guo , Cangtao Zhou , Qitao Lue , Shuangchen Ruan

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Abstract

We experimentally demonstrated a compact, highly efficient, stable, chirped pulse amplification (CPA) thin-disk regenerative system with a tunable repetition rate. The laser head consists of a 9 at. % Yb:YAG thin-disk with a diameter of 8.8 mm and a thickness of 150 μm, is designed for a 48-pump pass configuration. In CPA-based regenerative amplifier configuration, a maximal output power of 85 W at 500 kHz is achieved with a conversion efficiency of 53.1 %. This corresponds to a pulse energy of 170 μJ. To the best of our knowledge, this is the highest conversion efficiency in CPA thin-disk regenerative amplifiers. The pulse width is compressed to 884 fs with a pair of grating, resulting in a peak power of 192 MW. At 85 W, a near diffraction limit beam quality factor M² of 1.40 is measured, which is essential in precision applications. In addition, remarkable long-term power stability is confirmed with a root-mean-square (RMS) fluctuation of 0.12 % over a 24-hour duration. The reported femtosecond amplifier is believed to be a promising tool for various applications such as extreme manufacturing, terahertz spectroscopy, etc.

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高效 Yb:YAG 薄盘啁啾脉冲放大器可提供具有可调重复率和高稳定性的 884 飞秒激光器

我们在实验中展示了一种结构紧凑、高效、稳定、具有可调重复率的啁啾脉冲放大（CPA）薄盘再生系统。激光头由一个直径为 8 英寸的 9 英寸 Yb:YAG 薄盘组成。Yb:YAG 薄盘直径为 8.8 毫米，厚度为 150 微米，设计用于 48 个泵浦通路配置。在基于 CPA 的再生放大器配置中，500 kHz 时的最大输出功率为 85 W，转换效率为 53.1%。这相当于 170 μJ 的脉冲能量。据我们所知，这是 CPA 薄盘再生放大器中最高的转换效率。使用一对光栅将脉冲宽度压缩到 884 fs，从而产生 192 MW 的峰值功率。在 85 W 的功率下，测得接近衍射极限的光束质量因数 M2 为 1.40，这在精密应用中至关重要。此外，显著的长期功率稳定性也得到了证实，24 小时内的均方根（RMS）波动为 0.12%。据信，报告中的飞秒放大器将成为极端制造、太赫兹光谱学等各种应用中大有可为的工具。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.