Abstract
A cuvette with a dense immersion mixture of LiF microparticles and isobutyl alcohol was used in resonators of dye and Nd:YAG lasers as a small-angle diffuser to obtain low-coherent generation. Beams with the degree of spatial coherence \(\gamma \leqslant 0.1\) were obtained at the output of PM567; Rh101; DCM dye lasers with a cuvette-diffuser under pum** by 532 nm/25 ns single shot pulses, and in Nd:YAG laser with a diffuser under 808 nm QCW LD pum** when controlling the state of immersion in the cuvette. Illustrations of laser beam profiles at changes in the temperature, radiation wavelength or the mixture composition in the cuvette are presented. Temperatures corresponding to the diffuser “initial state” with the maximum level of immersion and cuvette transmission for different laser wavelengths in the visible and near-IR spectral regions were defined. A phenomenological model describing the operation of a laser with a diffuser in the “working state” (low-coherent lasing) is considered. The possibility of use of an immersion diffuser to obtain low-coherence output in dye and solid-state lasers at various wavelengths in the visible and near-IR spectral regions is discussed.
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Acknowledgements
The authors thank P.G. Zverev and V.A. Konyushkin for help in preparing the components of immersion solutions and studying their characteristics.
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BOA: calculations and construction of dependences of the refractive indices of the LiF/iso diffuser components and its operating temperatures on the wavelength, processing the results of laser experiments, preparing the text of the manuscript and figures for publication. BOA, PVA, SYV: study of characteristics of immersion LiF/iso diffuser, experiments on dye lasers with LiF/iso diffuser. KAL, SYV, TIM, CEA : experiments with NdYAG laser with immersion LiF/iso diffuser, processing of experimental results, preparation of figures 11,12,13. BOA., KAL, SYV, PVA: wrote the main manuscript text. All authors reviewed the manuscript.
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Burdukova, O., Cheshev, E., Koromyslov, A. et al. Intra-cavity immersion diffuser for low-coherence generation in dye and solid-state lasers. Appl. Phys. B 129, 9 (2023). https://doi.org/10.1007/s00340-022-07951-3
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DOI: https://doi.org/10.1007/s00340-022-07951-3