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

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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
Volume10900
PublisherSPIE - International Society for Optical Engineering
Publication date2019
Article number109000O
DOIs
Publication statusPublished - 2019
EventSPIE Lase - The Moscone Center, San Francisco, United States
Duration: 2 Feb 20197 Feb 2019

Conference

ConferenceSPIE Lase
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
Period02/02/201907/02/2019
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume10900
ISSN0277-786X
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

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

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