1 kW cw fiber-coupled diode laser with enhanced brightness

Guillermo Garre-Werner; Joan J. Montiel-Ponsoda; Volker Raab; Gemma Safont; Carsten Bree; Mindaugas Radziunas; Crina Cojocaru; Kestutis Staliunas

doi:10.1117/12.2546086

2 March 2020 1 kW cw fiber-coupled diode laser with enhanced brightness

Guillermo Garre-Werner, Joan J. Montiel-Ponsoda, Volker Raab, Gemma Safont, Carsten Bree, Mindaugas Radziunas, Crina Cojocaru, Kestutis Staliunas

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Proceedings Volume 11262, High-Power Diode Laser Technology XVIII; 1126202 (2020) https://doi.org/10.1117/12.2546086
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

We developed a 1kW cw fiber-coupled diode laser at 9XX nm by using beam combining of eight high power diode laser bars. To achieve beam combining, we employ Lyot-filtered optical reinjection from an external cavity, which forces lasing of the individual diode laser bars on intertwined frequency combs with overlapping envelopes and enables a high optical coupling efficiency. Unlike other spectral beam combining techniques that are based on the use of grating elements, this technique is insensitive to the thermal drift of the laser diodes. In addition to this, the FWHM spectral width at 1 kW output power is only around 7 nm, which is convenient for wavelength sensitive applications such as pumping.

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Guillermo Garre-Werner, Joan J. Montiel-Ponsoda, Volker Raab, Gemma Safont, Carsten Bree, Mindaugas Radziunas, Crina Cojocaru, and Kestutis Staliunas "1 kW cw fiber-coupled diode laser with enhanced brightness", Proc. SPIE 11262, High-Power Diode Laser Technology XVIII, 1126202 (2 March 2020); https://doi.org/10.1117/12.2546086

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