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首页> 外文会议>Solid state lasers XXIII: technology and devices >Mid-infrared diamond Raman laser with tuneable output
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Mid-infrared diamond Raman laser with tuneable output

机译：具有可调输出的中红外钻石拉曼激光器

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We present an OPO pumped mid IR diamond Raman laser with tuneable output from 3.49 μm to 3.78 μm, which to our knowledge is the longest wavelength produced in a solid state Raman laser. Up to 59 μJ is generated with a conversion efficiency of 10%. We also determine the Raman gain coefficient of diamond at 1.864 μm through measurement of the amplification of a seed signal. With pump and probe polarisations aligned with the <110> crystal axes a value of 4.8 cm/GW is measured, which corresponds to 6.4 cm/GW for polarisation aligned with the <111> crystal axes. Achievable conversion efficiencies were limited by multi-phonon absorption at the Stokes wavelength. Numerical modelling shows that increasing the output coupling factor of the cavity reduces the impact of multi-phonon absorption and leads to higher conversion efficiencies. By reducing the output coupler reflectivity from 55% to 5% and eliminating Fresnel reflections from cavity components, 30% conversion efficiency (44% quantum conversion efficiency) is predicted.
机译：我们介绍了一种OPO泵浦中红外钻石拉曼激光器，其可调输出范围为3.49μm至3.78μm，据我们所知，这是固态拉曼激光器产生的最长波长。产生高达59μJ的转换效率，为10％。我们还通过测量种子信号的放大倍数来确定钻石在1.864μm的拉曼增益系数。在泵浦和探头偏振与<110>晶轴对齐的情况下，测得的值为4.8 cm / GW，对于与<111>晶轴对齐的偏振，该值为6.4 cm / GW。在斯托克斯波长下，多声子吸收限制了可达到的转换效率。数值模型表明，增加腔体的输出耦合因子可减少多声子吸收的影响，并提高转换效率。通过将输出耦合器的反射率从55％降低到5％，并消除腔组件的菲涅耳反射，可以预测出30％的转换效率（44％的量子转换效率）。

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