Recent advances in cryogenic optical refrigeration have demonstrated cooling of a payload to below 125 K, enabled by several improvements. The parasitic load from pump and fluorescence scattering on the payload are minimized using a textured-MgF2 thermal link. Amplified Spontaneous Emission and lasing are suppressed by spectrally selective coatings on the multi-pass pump circulator. Power scaling of the cooling lift at cryogenic temperatures is yet to be observed, prompting us to investigate the negative contribution of pump saturation on a material's cooling efficiency and, thus, Minimal Achievable Temperature. A systematic study of the power-dependent performance of the cryocooler is reported.
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Kock et al. (2024) studied this question.
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