Methods for improving the beam quality of high-power diode lasers

Volker Raab; Martin Ostermeyer; Ralf Menzel

doi:10.1117/12.364221

20 September 1999 Methods for improving the beam quality of high-power diode lasers

Volker Raab, Martin Ostermeyer, Ralf Menzel

Proceedings Volume 3822, Computer-Controlled Microshaping; (1999) https://doi.org/10.1117/12.364221
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

Current commercially available diode lasers with output powers above a few watts lack beam quality, i.e. the ability to be precisely focused. Recent advances in coherent coupling 1,2 of such lasers open view to a new generation of high power, high beam quality, low cost lasers suitable for a wide range of technical applications such as microshaping or cutting. Therefore, we couple bars of 25 diode lasers with total output powers of 25-40 Watts and specially coated lowreflection front facets. Mutual coherence is achieved in external resonators as opposed to the internal resonator absent in our case. Additional elements like mode stops can improve beam quality. Here we present results on the coupling of gain-guided broad-area diode lasers in external resonators, both of single emitters and bars of 25 emitters. Also numerical simulations concerning the mutual coherence of the single emitters have been performed.

Citation Download Citation

Volker Raab, Martin Ostermeyer, and Ralf Menzel "Methods for improving the beam quality of high-power diode lasers", Proc. SPIE 3822, Computer-Controlled Microshaping, (20 September 1999); https://doi.org/10.1117/12.364221

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