Comparison of concepts for high-brightness diode lasers at 976 nm

J. Gilly; P. Friedmann; H. Kissel; J. Biesenbach; M. T. Kelemen

doi:10.1117/12.840698

17 February 2010 Comparison of concepts for high-brightness diode lasers at 976 nm

J. Gilly, P. Friedmann, H. Kissel, J. Biesenbach, M. T. Kelemen

Proceedings Volume 7583, High-Power Diode Laser Technology and Applications VIII; 75830S (2010) https://doi.org/10.1117/12.840698
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

Especially for fiber pump applications there is a strong demand for high-brightness diode lasers in the 10W power regime. Broad-area and tapered laser concepts seem to be the most promising candidates for high brightness, which is proportional to output power divided by beam quality. Within this talk we give a comparison of both concepts identifying the possibilities and limitations of both concepts. Whereas fast axis far fields show mostly a current independent behaviour, for broad-area lasers near- and farfields in the slow axis suffer from a strong current and temperature dependence, limiting the brightness. For tapered diode lasers the brightness is limited by the temperature characteristics of M² and astigmatism. Therefore for both concepts it is essential to have lasers with excellent thermal management, which can be realized by 4- 5mm long resonators in combination with wall-plug efficiencies well beyond 60%. To fulfill these issues, we have realized MBE grown InGaAs/AlGaAs broad-area and tapered lasers with resonator lengths between 4mm and 5mm and 45° fast axis far field emitting at 976nm. For a 5mm long broadarea laser with 90μm stripe width a beam parameter product of less than 5.9 mm x mrad (M²<10) has been achieved at 10W with a slope efficiency of 1.1W/A and a maximum wall-plug efficiency of 65%. For a tapered laser with a taper angle of 4° and 5mm resonator length, 10W have been demonstrated with a slope efficiency of 1.05W/A and a maximum wall-plug efficiency of 56%. Beam quality is below 3 up to 8W.

Citation Download Citation

J. Gilly, P. Friedmann, H. Kissel, J. Biesenbach, and M. T. Kelemen "Comparison of concepts for high-brightness diode lasers at 976 nm", Proc. SPIE 7583, High-Power Diode Laser Technology and Applications VIII, 75830S (17 February 2010); https://doi.org/10.1117/12.840698

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