Separate phase-locking and coherent combining of two laser diodes in a Michelson cavity

Schimmel, G. and Doyen, I. and Janicot, S. and Ramirez, L.P. and Hanna, M. and Georges, P. and Lucas-Leclin, G. and Vilokkinen, V. and Melanen, P. and Uusimaa, P. and Decker, J. and Crump, P. and Erbert, G. and Bull, S. and Kaunga-Nyirenda, S. and Larkins, E.C. (2015) Separate phase-locking and coherent combining of two laser diodes in a Michelson cavity. In: High-Power Diode Laser Technology and Applications XIII, 8-10 February 2015, San Francisco, California, United States.

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Abstract

We describe a new coherent beam combining architecture based on passive phase-locking of two laser diodes in a Michelson external cavity on their rear facet, and their coherent combination on the front facet. As a proof-of-principle, two ridge lasers have been coherently combined with >90 % efficiency. The phase-locking range, and the resistance of the external cavity to perturbations have been thoroughly investigated. The combined power has been stabilized over more than 15 min with an optical feedback as well as with an automatic adjustment of the driving currents. Furthermore, two high-brightness high-power tapered laser diodes have been coherently combined in a similar arrangement; the combining efficiency is 70% and results in an output power of 4 W. We believe that this new configuration combines the simplicity of passive self-organizing architectures with the optical efficiency of master-oscillator power-amplifier ones.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Schimmel, G. [et al.],"Separate phase-locking and coherent combining of two laser diodes in a Michelson cavity", Proc. SPIE, High-Power Diode Laser Technology and Applications XIII, editor, Mark S. Zediker, v. 9348, article no. 93480P (2015). doi:10.1117/12.2079314. Copyright 2015. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Keywords: coherent combining, passive phase-locking, diode lasers, external cavity
Schools/Departments: University of Nottingham UK Campus > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: https://doi.org/10.1117/12.2079314
Depositing User: Eprints, Support
Date Deposited: 27 Jul 2016 13:08
Last Modified: 21 Sep 2016 20:42
URI: http://eprints.nottingham.ac.uk/id/eprint/35477

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