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Highly efficient picosecond Raman generators based on the BaWO4 crystal in the near infrared, visible, and ultraviolet

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4 Author(s)
Cerny, P. ; Fac. of Nucl. Sci. & Phys. Eng., Czech Tech. Univ., Prague, Czech Republic ; Jelinkova, H. ; Basiev, T.T. ; Zverev, P.G.

The stimulated Raman scattering process in a BaWO4 crystal was employed to frequency downshift the first, second, and third harmonics of a Nd:YAG actively-passively mode-locked laser system. Single-pass, double-pass, and external cavity configurations were investigated for this purpose. In each experimental arrangement, the Stokes radiation properties were characterized regarding energy, beam profile, spectrum, and temporal development. The peak pump-to-first-Stokes conversion efficiency was measured to be 55% in the near infrared and 85% in the visible spectral region. The BaWO4 picosecond Raman gain at a pump wavelength of 355 nm was measured to be 38 cm/GW, and a 15% conversion efficiency was achieved. A study of the Raman-cavity output beam profile development as a function of pumping energy was conducted. This work shows that the BaWO4 crystal can be used in picosecond solid-state laser systems as an efficient frequency converter with a wide range of pump radiation wavelengths.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:38 ,  Issue: 11 )