Alternative wavelengths for optically pumped alkali lasers

Glen P. Perram

doi:10.1117/12.920648

7 May 2012 Alternative wavelengths for optically pumped alkali lasers

Glen P. Perram

Proceedings Volume 8381, Laser Technology for Defense and Security VIII; 838109 (2012) https://doi.org/10.1117/12.920648
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

As pump intensity in Diode Pumped Alkali Lasers (DPAL) is scaled to more than 100 times threshold, several nonlinear optical processes are encountered including two photon absorption and stimulated Raman scattering. A pulsed, optically pumped potassium laser with pump intensities exceeding 1 MW/cm² has been demonstrated with output intensities exceeding 100 kW/cm², requiring helium buffer gas pressures above 3 atm. At low pressure Stimulated Electronic Raman Scattering (SERS) has been observed in the same system. Indeed, second and third order SERS has been observed from the DPAL upper laser level. Two-photon absorption at wavelengths near then DPAL pump transition has also been observed and used to demonstrate lasing in the blue and mid infrared. Lasing in the blue has also been achieved by direct excitation of the second excited ²P_3/2 level in Cs.

Citation Download Citation

Glen P. Perram "Alternative wavelengths for optically pumped alkali lasers", Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 838109 (7 May 2012); https://doi.org/10.1117/12.920648

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