1 kW cw fiber-coupled diode laser with enhanced brightness
Guillermo Garre-Werner (a,b), Joan J. Montiel-Ponsoda (a), Volker Raab (c), Gemma Safont (a), Carsten Bree (d), Mindaugas Radziunas (d), Crina Cojocaru (b), Kestutis Staliunas (b,e)
(a) Monocrom S.L., Carrer de la Vilanoveta 6, 08800 Vilanova i la Geltrú, Spain; (b) Physics Department, Universitat Politècnica de Catalunya (UPC), Rambla Sant Nebridi 22, 080222 Terrassa, Barcelona, Spain; (c) Raab-Photonik GmbH, Amundsenstr. 10,14469 Postdam, Germany; (d) Weierstrass Institute for Applied Analysis and Stochastics Leibniz Instite in Forschungsverbund Berlin e.V, Mohrenstrasse 39, 10117 Berlin, Germany; (e) Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain
Presented at
SPIE LASE, 2020, San Francisco, California, United States
Proceedings Volume 11262, High-Power Diode Laser Technology XVIII; 1126202 (2020) https://doi.org/10.1117/12.2546086
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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