Modeling of pulsed K diode pumped alkali laser: Analysis of the experimental results

Ilya Auslender, Boris Barmashenko, Salman Rosenwaks, Boris Zhdanov, Matthew Rotondaro, Randall J. Knize

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A simple optical model of K DPAL, where Gaussian spatial shapes of the pump and laser intensities in any cross section of the beams are assumed, is reported. The model, applied to the recently reported highly efficient static, pulsed K DPAL [Zhdanov et al, Optics Express 22, 17266 (2014)], shows good agreement between the calculated and measured dependence of the laser power on the incident pump power. In particular, the model reproduces the observed threshold pump power, 22 W (corresponding to pump intensity of 4 kW/cm2), which is much higher than that predicted by the standard semi-analytical models of the DPAL. The reason for the large values of the threshold power is that the volume occupied by the excited K atoms contributing to the spontaneous emission is much larger than the volumes of the pump and laser beams in the laser cell, resulting in very large energy losses due to the spontaneous emission. To reduce the adverse effect of the high threshold power, high pump power is needed, and therefore gas flow with high gas velocity to avoid heating the gas has to be applied. Thus, for obtaining high power, highly efficient K DPAL, subsonic or supersonic flowing-gas device is needed.

Original languageEnglish
Pages (from-to)20986-20996
Number of pages11
JournalOptics Express
Volume23
Issue number16
DOIs
StatePublished - 10 Aug 2015

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