Continuous-wave and Fe2+:ZnSe passively Q-switched mid-infrared lasers based on 2at.% Er3+:CaF2 crystal

Q3 Physics and Astronomy

Results in Optics Pub Date : 2024-03-07 DOI:10.1016/j.rio.2024.100650

Zhonghai Yang , Zhen Zhang , Zhenhua Cong , Peng Liu , Zhigang Zhao , Liangbi Su , Zhaojun Liu

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引用次数: 0

Abstract

A compact high-power 2.8-µm laser with a 2 at.%-doped Er³⁺:CaF₂ crystal was demonstrated, which delivered a maximum output power of 2.848 W with a slope efficiency of 26.3 %. To the best of our knowledge, this is the highest output power among all the reported LD end-pumped Er³⁺-doped fluoride crystal lasers. Experimentally, the negative thermal lens effect was characterized and the thermal lens optical diopters for two axes were obtained as M_x = -0.21 m⁻¹/W and M_y = -0.33 m⁻¹/W. In addition, the visible fluorescence spectra of Er³⁺:CaF₂ crystal with and without laser operation were measured and analyzed. With Fe²⁺:ZnSe as saturable absorber, a passively Q-switched 2.759-µm Er³⁺:CaF₂ laser with an average output power of 75 mW, a peak power of 2.39 W, a single pulse energy of 1.81 µJ, and a pulse width of 755.3 ns was obtained at a repetition rate of 41.55 kHz.

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基于 2at.% Er3+:CaF2 晶体的连续波和 Fe2+:ZnSe 被动 Q 开关中红外激光器

我们展示了一种紧凑型高功率 2.8 微米激光器，该激光器采用掺杂 2%的 Er3+:CaF2 晶体，最大输出功率为 2.848 W，斜率效率为 26.3%。据我们所知，这是所有已报道的 LD 端泵掺杂 Er3+ 的氟化物晶体激光器中输出功率最高的。在实验中，对负热透镜效应进行了表征，得到了两个轴的热透镜光学斜率分别为 Mx = -0.21 m-1/W 和 My = -0.33 m-1/W。此外，还测量和分析了 Er3+:CaF2 晶体在有激光操作和无激光操作时的可见荧光光谱。以 Fe2+:ZnSe 作为可饱和吸收体，在 41.55 kHz 的重复频率下，获得了平均输出功率为 75 mW、峰值功率为 2.39 W、单脉冲能量为 1.81 µJ、脉宽为 755.3 ns 的被动 Q 开关 2.759µm Er3+:CaF2 激光。

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来源期刊

Results in Optics Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

2.50

自引率

0.00%

发文量

115

审稿时长

71 days