Imperial College London

Dr Robbie Murray

Faculty of Natural SciencesDepartment of Physics

Imperial College Research Fellow



+44 (0)20 7594 9672robert.murray10




636CBlackett LaboratorySouth Kensington Campus






BibTex format

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 = {},
volume = {44},
year = {2019}

RIS format (EndNote, RefMan)

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 -
UR -
VL - 44
ER -