Journal
APPLIED SCIENCES-BASEL
Volume 12, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/app122211644
Keywords
spectral modulation; nonlinear optics; infrared lasers; fiber lasers; nonlinear crystals
Categories
Funding
- National Natural Science Foundation of China [61975236, 2019-JCJQ-JJ-202]
- Open Research Fund of State Key Laboratory of Pulsed Power Laser Technology, Electronic Countermeasure Institute, National University of Defense Technology [SKL2020ZR03]
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A double-peaked mid-infrared laser was generated using intracavity difference frequency generation, achieving a tunable double-peaked spacing and controllable peak width. It has high potential for gas molecule monitoring and absorption.
It was reported that a double-peaked mid-infrared laser was generated based on an intracavity difference frequency generation (DFG). The double-peaked pump source was achieved by suppressing the intensity at the central wavelength of the pump source. The double-peaked mid-infrared generation had a double-peaked spacing of 23-37 nm, and the full width at half-peak (FWHM) of the peaks was up to 30 nm. It was demonstrated that a tilted Bragg fiber grating (TFBG) with a specific transmission spectral depth and bandwidth can generate a double-peaked mid-infrared laser with controllable double-peaked spacing. It was the first generation of a double-peaked mid-infrared laser based on a near-infrared pumping spectral modulation. Furthermore, the double-peaked mid-infrared generation was tunable, and the FWHMs of the peaks were controllable by an intracavity DFG. It had a high potential for the monitoring and absorption of gas molecules by differential absorption lidar (DIAL).
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