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Improving the beam quality of DPALs by refractive index gradients induced by the pump beam in the heated gain medium: experimental verification of the theoretical prediction

Roei Luzon, Svyatoslav Kostyukovets, Ilya Auslender, Nitzan Mayorkas, Eyal Yacoby, Boris D. Barmashenko, and Salman Rosenwaks

Abstract

We recently predicted [J. Opt. Soc. Am. B 35, 558 (2018) [CrossRef]  ] that large radial gradients of the refractive index induced by the pump beam in the heated gain medium of diode-pumped alkali lasers (DPALs) could lead to improved DPAL beam quality. This effect depends on the composition of the buffer gas in the cell. We report here on verifying this counterintuitive finding by careful measurements of the beam quality factor ${M^2}$ in static Cs DPALs with different compositions of the buffer gases.

© 2021 Optical Society of America

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