Journal
OPTICA
Volume 4, Issue 10, Pages 1163-1166Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.4.001163
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA2386-16-1-4030]
- Australian Research Council (ARC) [DP170100531]
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Broadband laser light sources in the mid-infrared region attract enormous interest due to the plethora of applications they are enabling, including multispecies trace gas detection, free-space communications, and infrared countermeasures. Key to the progress in supercontinuum generation has been the wide availability of fiber-based near-infrared and bulk-optic mid-infrared pump sources and suitably engineered nonlinear media capable of supporting high-brightness supercontinua. A large proportion of the system complexity relates to the pump source itself with free-space systems based on parametric conversion being the most common for the generation of long-wavelength supercontinua. In an effort to realize all fiber and all mid-infrared supercontinuum sources, we combine a recently developed 2.9 mu m ultrafast fiber laser based on holmium with an environmentally stable, polymer-protected all-chalcogenide tapered fiber. By launching 230 fs, 4.2 kW peak power pulses into the As2Se3/As2S3 tapered fiber, we demonstrate a spectrum spanning from 1.8 to 9.5 mu m at the - 20 dB points with an average power of more than 30 mW. This > 2 octave-spanning supercontinuum is a crucial step toward robust mid-infrared broadband sources required for future field-deployable instruments. (C) 2017 Optical Society of America
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