Gain-switched laser-diode-pumped Er3+:CaF2 crystal laser at 2.8 μm

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-09-17 DOI:10.1016/j.optcom.2025.132469

Lifen Liao , Zhen Zhang , Zhanduo Qiao , Wenqi Ge , Changjun Ke

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引用次数: 0

Abstract

The energy level transitions of the Er³⁺:CaF₂ crystal are analyzed, and the rate equation of the Er³⁺:CaF₂ laser in gain-switching mode is calculated. The relationship between the peak photon energy and pulse duration of the output laser is simulated in the gain-switch mode of the Er³⁺:CaF₂ crystal laser. Based on theoretical analysis, we utilize Er³⁺:CaF₂ crystals with a low doping concentration of 3 %, grown via the temperature gradient method, as the gain medium to develop a laser oscillation. For the first time, a 50-Hz frequency and 2.76-μm wavelength laser output is obtained via laser diode room-temperature gain-switched pumping. The laser pulse duration reaches 228.4 ns, with a single-pulse energy of 30.0 μJ and a peak power of 0.131 kW. When compared with the existing Er³⁺:CaF₂ stable Q-switching oscillation, the shortest pulse duration and high peak output power for the Er³⁺:CaF₂ crystal pumped by laser diode is achieved. Experimental results demonstrate that low-doped Er³⁺:CaF₂ crystals can be used as laser material for room-temperature operation, nanosecond pulse duration, high peak power, and 3-μm wavelength laser.

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2.8 μm增益开关激光二极管泵浦Er3+:CaF2晶体激光器

分析了Er3+:CaF2晶体的能级跃迁，计算了增益开关模式下Er3+:CaF2激光器的速率方程。在Er3+:CaF2晶体激光器的增益开关模式下，模拟了输出激光的峰值光子能量与脉冲持续时间之间的关系。在理论分析的基础上，我们利用温度梯度法生长的低掺杂浓度为3%的Er3+:CaF2晶体作为增益介质来产生激光振荡。利用激光二极管室温增益开关泵浦，首次获得了频率为50 hz、波长为2.76 μm的激光输出。激光脉冲持续时间达到228.4 ns，单脉冲能量为30.0 μJ，峰值功率为0.131 kW。与现有的Er3+:CaF2稳定调q振荡相比，激光二极管泵浦的Er3+:CaF2晶体脉冲持续时间最短，峰值输出功率最高。实验结果表明，低掺杂的Er3+:CaF2晶体可以作为室温、纳秒脉冲、峰值功率和3 μm波长的激光材料。

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

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.