Advanced Optically Pumped Solid-State Lasers

Applied Physics B

, Volume 58, Issue 5, pp 397-402

First online:

Temperature dependence of efficiency and thermal lensing of diode-laser-pumped Nd:YAG lasers

  • U. BrauchAffiliated withDeutsche Forschungsanstalt für Luft- und Raumfahrt e. V., Institut für Technische Physik

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Efficiencies, lasing thresholds and thermal lensing of a Nd:YAG rod side-pumped with two 10 W diode-laser-arrays are measured for various rod temperatures between 80 K and 380 K. The threshold is reduced by a factor of 2.5–4 on cooling from room temperature to about 100 K, while the slope efficiency is increased by between 0% and 50% depending on the reflectivity of the outcoupling mirror. Extrapolation to a 240 W pumped laser gives an increase in optical efficiency of 25% to 30%. The thermal lensing measured with a beam deflection and an interferometric method is reduced by a factor of 10.