28 February 2006 New wavelengths generated by BaWO4 or KGW intracavity Raman laser
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Abstract
The paper deals with the generation of new infrared laser wavelengths (1.175 μm, 1.196 μm, and 1.199 μm) based on the intracavity Raman conversion of the Nd:YAP laser radiation (1.0796 μm). Barium tungstate (BaWO4) and potassium gadolinium tungstate (KGW) crystals were used as solid state Raman converters. The laser was based on three-mirror linear cavity forming resonator for fundamental (resonator lengths 126 mm) and Raman (resonator lengths 35 mm) radiation generation. As an active laser crystal Nd:YAP in the form of Brewster angle trigonal slab was used. This shape of the active medium enables constructing the simple linear laser cavity. For pumping of this crystal the QCW fast-axis collimated laser diode was used. To obtain high peak power in fundamental radiation, the Cr4+:YAG crystal was used for Q-switching. The Raman laser was optimized for maximal output energy at the first Stokes wavelength. A stable output was reached for both Raman crystals. In the case of BaWO4 crystal the output pulse (energy ~165 μJ, length of pulse 1.7 ns) with a wavelength of 1.199 μm was generated. The Raman generated wavelengths in the case of KGW crystal were 1.1756 μm and 1.1957 μm, depending on the orientation of the crystal inside the resonator. The output energy in the generated pulse with a length of ~1 ns (FWHM) was ~90 μJ for both orientations. The beam output structure was close to the fundamental mode with the divergence ~ 3-4 mrad. The efficient second harmonic generation giving possibility of new wavelengths generation in visible region was demonstrated.
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Helena Jelínkova, Helena Jelínkova, Jan Šulc, Jan Šulc, Michal Němec, Michal Němec, Jan K. Jabczynski, Jan K. Jabczynski, Waldemar Zendzian, Waldemar Zendzian, } "New wavelengths generated by BaWO4 or KGW intracavity Raman laser", Proc. SPIE 6100, Solid State Lasers XV: Technology and Devices, 61001E (28 February 2006); doi: 10.1117/12.646065; https://doi.org/10.1117/12.646065
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