CC BY
18LS-PS-12
Synchronously pumped crystalline Raman lasers with combined frequency shift
S. Smetanin1, M. Frank2, M. Jelinek2, D. Vyhlidal2, V. Shukshin1, L. Ivleva1, E. Dunaeva1, I. Voronina1, P. Zverev1, V. Kubecek2
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Department of Laser Materials and Photonics, Moscow, Russian Federation 2Czech Technical University, Faculty of Nuclear Sciences and Physical Engineering, Prague 1, Czech Republic
Comparative investigation of characteristics of spontaneous and stimulated Raman scattering (SRS) in different crystals with tetragonal scheelite- and zircon-type structure at both high and low frequency anionic group vibrations is presented. It has been found that among these crystals, the SrMoO4, SrWO4, and GdVO4 crystals are the most perspective for SRS generation on both stretching and bending modes of internal anionic group vibrations with the strongest SRS pulse shortening under picosecond synchronous laser pumping because of not only highly intense stretching Raman mode for efficient primary extracavity long-shifted SRS conversion, but also the most broadened bending Raman mode for the strongest SRS pulse shortening down to the inverse linewidth of the broadened bending Raman mode (~ 1 ps) at secondary intracavity short-shifted SRS conversion. The strongest 42-fold pump pulse shortening down to 860 fs at the 1228-nm Stokes component with the combined (882 cm1 + 382 cm1) Raman shift in the extracavity GdVO4 Raman laser with synchronous pumping by the 1063-nm, 36-ps, 150-MHz Nd:GdVO4 laser has been demonstrated. Highly efficient operation of the synchronously pumped ultrafast Raman lasers based on BaWO4 (conversion up to 69 %), SrWO4 (conversion up to 45 %), and GdVO4 (conversion up to 50 %) Raman-active crystals has been achieved.
