Journal
OPTICS EXPRESS
Volume 26, Issue 9, Pages 11756-11763Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.011756
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Funding
- National Science Centre (NCN) [UMO-2014/13/D/ST7/02143]
- Polish Ministry of Science and Higher Education [IP2015 072674]
- Statutory Founds of the Chair of EM Field Theory, Electronics Circuits and Optoelectronics, Faculty of Electronics
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We report the first fully fiberized difference frequency generation (DFG) source, delivering a broadly tunable idler in the 6 to 9 mu m spectral range, using an orientation-patterned gallium phosphide (OP-GaP) crystals with different quasi-phase matching periods (QPM). The mid-infrared radiation (MIR) is obtained via mixing of the output of a graphene-based Er-doped fiber laser at 1.55 mu m with coherent frequency-shifted solitons at 1.9 mu m generated in a highly nonlinear fiber using the same seed. The presented setup is the first truly all-fiber, all-polarization maintaining, alignment-free DFG source reported so far. Its application to laser spectroscopy was demonstrated by the absorption spectrum measurement of nu(4) band of methane in 7.5 - 8.3 mu m spectral range. The system simplicity and compactness paves the way for applications in field-deployable optical frequency comb spectroscopy systems for gas sensing. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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