High peak power diode stacks for high energy lasers

Viorel C. Negoita; Thilo Vethake; John Jiang; Robert Roff; Ming Shih; Richard Duck; Marc Bauer; Roberto Mite; Konstantin M. Boucke; Georg Treusch

doi:10.1117/12.2080489

26 February 2015 High peak power diode stacks for high energy lasers

Viorel C. Negoita, Thilo Vethake, John Jiang, Robert Roff, Ming Shih, Richard Duck, Marc Bauer, Roberto Mite, Konstantin M. Boucke, Georg Treusch

Author Affiliations +

Proceedings Volume 9345, High Power Lasers for Fusion Research III; 934504 (2015) https://doi.org/10.1117/12.2080489
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

High energy solid state lasers are being developed for fusion experiments and other research applications where high energy per pulse is required but the repetition rate is rather low, around 10Hz. We report our results on high peak power diode laser stacks used as optical pumps for these lasers. The stacks are based on 10 mm bars with 4 mm cavity length and 55% fill factor, with peak power exceeding 500 W per bar. These bars are stacked and mounted on a cooler which provides backside cooling and electrical insulation. Currently we mount 25 bars per cooler for a nominal peak power of 12.5 kW, but in principle the mounting scheme can be scaled to a different number of devices depending on the application. Pretesting of these bars before soldering on the cooler enables us to select devices with similar wavelength and thus we maintain tight control of the spectral width (FWHM less than 6 nm). Fine adjustments of the centroid wavelength can be done by means of temperature of the cooling fluid or bias current. The available wavelength range spans from 880 nm to 1000 nm, and the wavelength of the entire assembly of stacks can be controlled to within 0.5 nm of the target value, which makes these stacks suitable for pumping a variety of gain media. The devices are fast axis collimated, with over 95% power being collimated in 6 mrad (full angle). The slow axis divergence is 9° (full angle) for 95% power content.

Citation Download Citation

Viorel C. Negoita, Thilo Vethake, John Jiang, Robert Roff, Ming Shih, Richard Duck, Marc Bauer, Roberto Mite, Konstantin M. Boucke, and Georg Treusch "High peak power diode stacks for high energy lasers", Proc. SPIE 9345, High Power Lasers for Fusion Research III, 934504 (26 February 2015); https://doi.org/10.1117/12.2080489

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