28 February 2014 Mid-infrared diamond Raman laser with tuneable output
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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.
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Alexander Sabella, Alexander Sabella, James A. Piper, James A. Piper, Richard P. Mildren, Richard P. Mildren, "Mid-infrared diamond Raman laser with tuneable output", Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 89590B (28 February 2014); doi: 10.1117/12.2037168; https://doi.org/10.1117/12.2037168

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