Mid-infrared supercontinuum generation to 4.5 microm in ZBLAN fluoride fibers by nanosecond diode pumping.
A mid-infrared supercontinuum (SC) is generated in ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF...) fluoride fibers from amplified nanosecond laser diode pulses with a continuous spectrum from approximately 0.8 microm to beyond 4.5 microm. The SC has an average power of approximately 23 mW, a pump-to-SC power conversion efficiency exceeding 50%, and a spectral power density of approximately -20 dBm/nm over a large fraction of the spectrum. The SC generation is initiated by the breakup of nanosecond laser diode pulses into femtosecond pulses through modulation instability, and the spectrum is then broadened primarily through fiber nonlinearities in approximately 2-7 m lengths of ZBLAN fiber. The SC long-wavelength edge is consistent with the intrinsic ZBLAN material absorption.
Xia
Chenan
C
Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA. caxia@umich.edu
Kumar
Malay
M
Kulkarni
Ojas P
OP
Islam
Mohammed N
MN
Terry
Fred L
FL
Freeman
Mike J
MJ
Poulain
Marcel
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Mazé
Gwenael
G