Abstract
Raman frequency conversion of high average power pulsed Nd:YAG laser radiation into the near IR spectral region in a barium nitrate Raman laser was studied with the emphasis on thermal effects inside the Raman-active medium. The probe-beam technique together with numerical reconstruction, done by integrating the transient heat conduction and paraxial wave equations, revealed dynamics of the induced distortions featuring high-order optical aberrations. By utilizing the Zernike expansion of the reconstructed phase profile and implementing a special focusing geometry of the pump beam, partial compensation of the distortions was realized in a stable configuration of the Raman cavity. Generation of the first-, second-, and third-order Stokes radiation with output power of 17, 9.5, and 5.5 W corresponding to a quantum conversion efficiency of 32, 21, and 13% is reported.
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This work was made possible by financial support from the Deutsche Forschungsgemeinschaft (Project EI 110/29-1) and by the International Science and Technology Center (Project B-1679).
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Chulkov, R., Lisinetskii, V., Lux, O. et al. Thermal aberrations and high power frequency conversion in a barium nitrate Raman laser. Appl. Phys. B 106, 867–875 (2012). https://doi.org/10.1007/s00340-012-4873-4
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DOI: https://doi.org/10.1007/s00340-012-4873-4