Open AccessAll-fiber mid-infrared source tunable from 6 to 9 μm based on difference frequency generation in OP-GaP crystal
Author(s) -
Jarosław Sotor,
Tadeusz Martynkien,
Peter G. Schunemann,
Paweł Mergo,
Lucile Rutkowski,
Grzegorz Soboń
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.011756
Subject(s) - optics , materials science , fiber laser , photonic crystal fiber , gallium phosphide , laser , spectroscopy , optoelectronics , polarization (electrochemistry) , optical fiber , physics , chemistry , quantum mechanics
We report the first fully fiberized difference frequency generation (DFG) source, delivering a broadly tunable idler in the 6 to 9 μm 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 μm with coherent frequency-shifted solitons at 1.9 μm 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 ν 4 band of methane in 7.5 - 8.3 µm spectral range. The system simplicity and compactness paves the way for applications in field-deployable optical frequency comb spectroscopy systems for gas sensing.