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@article{Chandran:2019:10.1364/OL.44.006025,
author = {Chandran, A and Runcorn, T and Murray, R and Taylor, J},
doi = {10.1364/OL.44.006025},
journal = {Optics Letters},
pages = {6025--6028},
title = {Nanosecond pulsed 620 nm source by frequency-doubling a phosphosilicate Raman fiber amplifier},
url = {http://dx.doi.org/10.1364/OL.44.006025},
volume = {44},
year = {2019}
}

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TY  - JOUR
AB  - We demonstrate a nanosecond pulsed source at 620 nm with watt-level average power by frequency-doubling a 1240 nm phosphosilicate Raman fiber amplifier. A gain-switched laser diode operating at 1064 nm is amplified in an ytterbium fiber master oscillator power amplifier system and then converted to 1240 nm using a phosphosilicate Raman fiber amplifier with a conversion efficiency of up to 66%. The Raman fiber amplifier is seeded with a continuous-wave 1240 nm laser diode to obtain narrow-linewidth radiation, which is subsequently frequency-doubled in a periodically poled lithium tantalate crystal. A maximum average power of 1.5 W is generated at 620 nm, corresponding to a pulse energy of 300 nJ at a repetition rate of 5 MHz. The source has excellent beam quality (M2≤1.16) and an optical efficiency (1064 nm to 620 nm) of 20%, demonstrating an effective architecture for generating red pulsed light for biomedical imaging applications.
AU  - Chandran,A
AU  - Runcorn,T
AU  - Murray,R
AU  - Taylor,J
DO  - 10.1364/OL.44.006025
EP  - 6028
PY  - 2019///
SN  - 0146-9592
SP  - 6025
TI  - Nanosecond pulsed 620 nm source by frequency-doubling a phosphosilicate Raman fiber amplifier
T2  - Optics Letters
UR  - http://dx.doi.org/10.1364/OL.44.006025
UR  - http://hdl.handle.net/10044/1/75137
VL  - 44
ER  -

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