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Proceedings Paper

High average power quasi-CW single-mode green and UV fiber lasers
Author(s): Alexey Avdokhin; Valentin Gapontsev; Pankaj Kadwani; Andreas Vaupel; Igor Samartsev; Nicholai Platonov; Alex Yusim; Daniil Myasnikov
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Paper Abstract

Kilowatt-level narrow-linewidth SM ytterbium fiber laser operating in high-repetition-rate QCW regime was used to obtain 700 W average power at 532 nm with single-mode beam quality and wall-plug efficiency of over 23 %. To the best of our knowledge, this is ~60 % higher power than previously reported for single-mode green lasers based on other platforms, and also is ~30 % increase comparing to the previous result obtained by our group on the base of similar fiber laser platform. We have also experimentally proved that the same type of fiber laser can be used for generating of world-record levels of power at other wavelengths of visible and UV spectral ranges by employing cascaded non-linear frequency conversion. Thus, utilizing frequency tripling in 2 LBO crystals, we achieved over 160 W average power of nearly single-mode UV light at 355 nm with THG efficiency of more than 25 %. As far as we know, this is the highest output power ever reported for UV laser with nearly diffraction limited beam quality. We also conducted some preliminary experiments to demonstrate suitability of our approach for generating longer wavelengths of the visible spectrum. By pre-shifting fundamental emission wavelength in fiber Raman converter, followed by frequency doubling in NCPM LBO, we obtained average powers of 36 W at 589 nm and 27 W at 615 nm. These proof-of-concept experiments were performed with low-power pump laser and were not fully optimized with respect to frequency conversion. Our analysis indicates that employing kW-level QCW ytterbium laser with optimized SRS and SHG converters we can achieve hundreds of Watts of average power in red and orange color with single-mode beam quality.

Paper Details

Date Published: 27 February 2015
PDF: 17 pages
Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 934704 (27 February 2015); doi: 10.1117/12.2185614
Show Author Affiliations
Alexey Avdokhin, IPG Photonics Corp. (United States)
Valentin Gapontsev, IPG Photonics Corp. (United States)
Pankaj Kadwani, IPG Photonics Corp. (United States)
Andreas Vaupel, IPG Photonics Corp. (United States)
Igor Samartsev, IPG Photonics Corp. (United States)
Nicholai Platonov, IPG Photonics Corp. (United States)
Alex Yusim, IPG Photonics Corp. (United States)
Daniil Myasnikov, IPG Photonics Corp. (United States)

Published in SPIE Proceedings Vol. 9347:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV
Konstantin L. Vodopyanov, Editor(s)

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