Cryogenic performance of Ho:YAP: spectroscopy and lasing at 2.1 \(\upmu\)m

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-03-18 DOI:10.1007/s00340-025-08437-8

Jan Šulc, Miroslav Coubal, Michal Němec, Helena Jelínková, Karel Nejezchleb, Štěpán Uxa

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引用次数: 0

Abstract

The holmium-doped yttrium aluminum perovskite (Ho:YAP, \(\hbox {Ho:YAlO}_{3}\)) is a promising material for high-power mid-infrared solid-state lasers. This study presents detailed temperature-dependent spectroscopic properties of Ho:YAP, including 2 \(\upmu\)m polarisation-resolved absorption and emission spectra, as well as the upper-laser-level lifetime, measured across a wide temperature range (4–300 K). For experimental validation, three Ho:YAP crystals with different orientations (\(\mathbf {{a}}\)-, \(\mathbf {{b}}\)-, and \(\mathbf {{c}}\)-cut) were employed as the gain medium in cryogenically cooled (78–300 K), multi-watt, resonantly pumped microchip lasers operating near 2.1 \(\upmu\)m. Similarly to other quasi-three-level laser media, Ho:YAP demonstrated a significant reduction in the laser threshold with decreasing temperature, alongside a simultaneous drop in effective absorption. The maximum output power was achieved at approximately 200 K. The orientation of the crystal primarily influenced the emission wavelength, while the lasers consistently exhibited linearly polarised output and fundamental-mode beam profiles. These findings confirm Ho:YAP as a versatile material for efficient laser operation in the mid-infrared region, even under cryogenic conditions.

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Ho:YAP的低温性能：2.1 \(\upmu\) m的光谱学和激光

掺钬钇铝钙钛矿（Ho:YAP, \(\hbox {Ho:YAlO}_{3}\)）是一种很有前途的大功率中红外固体激光器材料。本研究详细介绍了Ho:YAP的温度依赖光谱特性，包括2 \(\upmu\) m偏振分辨吸收和发射光谱，以及在宽温度范围（4-300 K）下测量的上激光级寿命。为了实验验证，采用三种不同取向的Ho:YAP晶体（\(\mathbf {{a}}\) -, \(\mathbf {{b}}\) -和\(\mathbf {{c}}\) -cut）作为低温冷却（78-300 K），多瓦，谐振泵浦微芯片激光器工作在2.1 \(\upmu\) m附近。与其他准三能级激光介质类似，Ho:YAP显示出随着温度降低，激光阈值显着降低，同时有效吸收下降。最大输出功率约为200k。晶体的取向主要影响发射波长，而激光器始终表现出线性偏振输出和基模光束轮廓。这些发现证实了Ho:YAP是中红外区域高效激光操作的通用材料，即使在低温条件下也是如此。

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.