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<p>2 μm lasers are widely employed in LIDAR systems, photomedicine, and as pump sources for OPOs and mid-IR lasers. Tm:YLF is an optimal laser crystal for a 2 μm laser owing to its good mechanical properties, a negative thermo-optic coefficient, and intrinsic birefringence supporting polarized emission. However, many 2 μm lasers have been reported to exhibit unstable operation with a tendency towards self-pulsation (SP). In this paper, we investigate design parameters influencing the temporal output of a compact diode-laser pumped Tm:YLF 1.91 μm laser for stable continuous-wave (CW) and self-pulsating operation. Different sources of perturbation are discussed as main causes for SP. We introduce a novel pulse attenuation parameter, <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\delta \)</EquationSource> </InlineEquation>, to assess laser stability. We report optical-to-optical slope efficiencies of 35% and 41.5% in stable CW and SP operation, respectively.</p>

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CW and self-pulsating operation of a Tm:YLF 1.91 μm hemispherical laser

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月11日

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  • Ludovica Appignani,
  • Peter Tidemand-Lichtenberg,
  • Lasse Høgstedt,
  • Søren Michael Mørk Friis,
  • Christian Pedersen

摘要

2 μm lasers are widely employed in LIDAR systems, photomedicine, and as pump sources for OPOs and mid-IR lasers. Tm:YLF is an optimal laser crystal for a 2 μm laser owing to its good mechanical properties, a negative thermo-optic coefficient, and intrinsic birefringence supporting polarized emission. However, many 2 μm lasers have been reported to exhibit unstable operation with a tendency towards self-pulsation (SP). In this paper, we investigate design parameters influencing the temporal output of a compact diode-laser pumped Tm:YLF 1.91 μm laser for stable continuous-wave (CW) and self-pulsating operation. Different sources of perturbation are discussed as main causes for SP. We introduce a novel pulse attenuation parameter, \(\delta \) , to assess laser stability. We report optical-to-optical slope efficiencies of 35% and 41.5% in stable CW and SP operation, respectively.