"Passively cooled 940 nm laser bars with 73% wall-plug efficiency at 70 W and 25 °C"
Electronics Letters, vol. 41, no. 5, pp. 250-251 (2005).
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940 nm laser bars with a vertical divergence of 27° (FWHM) and a filling factor of 30% were operated on passively cooled heatsinks at 25 °C. The maximum output power was 95 W, the maximum wall-plug efficiency was 73% at 70 W. Reliability C Wand quasi-CW operation up to 98 W was demonstrated.
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany