Recent progress in brightness scaling by coherent beam combining of tapered amplifiers for efficient high power frequency doubling

P. Albrodt , Muhammad Tahir Jamal, Anders Kragh Hansen, Ole Bjarlin Jensen, M. Niemeyer, G. Blume, K. Paschke, P. Crump, J. Hamperl, P. Georges, G. Lucas-Leclin

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High brightness diode laser beam combining techniques are in demand for efficient high power nonlinear conversion. Coherent beam combining (CBC) is the only method that has the potential for brightness scaling by maintaining one single narrow spectral linewidth. CBC in a master oscillator power amplifier (MOPA) configuration using a small number of efficiently cooled tapered amplifiers is a promising approach for efficient brightness scaling in a simple architecture. We present the application of such a source based on CBC of three tapered amplifiers seeded by a DFB laser at λ = 976 nm for second harmonic generation (SHG). A maximum power of 2.1 W at 488 nm was generated by SHG in a MgO:PPLN bulk crystal limited by thermal effects. A clear benefit of the beam clean-up resulting from the CBC setup was documented leading to an improved nonlinear efficiency. As part of our ongoing studies into further brightness scaling in CBC architectures, we present an experimental analysis of the phase dynamics of tapered amplifiers in quasi continuous operation (QCW) at high currents. Furthermore, we are investigating different amplifier designs for improved beam quality at high powers and therefore improved combining efficiency.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages11
PublisherSPIE - International Society for Optical Engineering
Publication date2019
Article number109000O
Publication statusPublished - 2019
EventSPIE Photonics West LASE 2019 - The Moscone Center, San Francisco, United States
Duration: 2 Feb 20197 Feb 2019


ConferenceSPIE Photonics West LASE 2019
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
SeriesProceedings of SPIE, the International Society for Optical Engineering


  • Coherent beam combining
  • Tapered laser amplifiers
  • High-brightness diode lasers
  • Second harmonic generation


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