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Simultaneous brightness enhancement and wavelength conversion to the eye‐safe region in a high‐power diamond Raman laser
Author(s) -
McKay Aaron,
Kitzler Ondrej,
Mildren Richard P.
Publication year - 2014
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201400012
Subject(s) - brightness , optics , materials science , laser , optoelectronics , raman spectroscopy , raman laser , laser beam quality , wavelength , multi mode optical fiber , diamond , pulse repetition frequency , energy conversion efficiency , raman scattering , optical fiber , physics , laser beams , telecommunications , radar , computer science , composite material
Brightness enhancement in an external cavity diamond Raman laser designed for high power conversion of a neodymium (1064 nm) laser to the eye‐safe spectral region is reported. Using a multimode input beam pulsed at 36 kHz pulse repetition frequency, 16.2 W with 40% overall conversion efficiency was obtained at the second Stokes wavelength of 1485 nm. The output beam had a quality factor ofM 2 = 1.17 ± 0.08 which is a factor of 2.7 times lower than that of the input beam, resulting in a higher overall brightness. The output power, brightness, and brightness enhancement obtained represent significant advances in performance for Raman lasers as well as other competing kHz‐pulsed eye‐safe technologies.