Journal
PHOTONICS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/photonics9100724
Keywords
infrared lasers; fiber lasers; nonlinear crystals; nonlinear optics
Categories
Funding
- National Natural Science Foundation of China [61975236, 2019-JCJQ-JJ-202]
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This research report presents the generation of broadband continuous-wave mid-infrared laser based on an OPO pumped by an ASE fiber source. By injecting a high-power and narrow linewidth fiber laser into a nonlinear crystal, phase-matching DFG can be achieved at a low pumping threshold. The results show that intracavity DFG can effectively generate a stable broadband mid-infrared laser during the down-conversion of the ASE fiber source.
The research reports broadband, continuous-wave (CW), mid-infrared generation based on an optical parametric oscillator (OPO), pumped by an amplified spontaneous emission (ASE) fiber source. The ASE fiber source has a ytterbium (Yb)-doped fiber master oscillator power amplifier (MOPA) structure. By injecting another fiber laser with high power and a narrow linewidth into the nonlinear crystal, the phase-matching difference frequency generation (DFG) can be realized at a low pumping threshold. It is shown that during the down-conversion of the ASE fiber source, the intracavity DFG can steadily and effectively generate a broadband mid-infrared laser, with a central wavelength of 3713 nm. The bandwidth of the mid-infrared laser is 122 nm. The pump power of 2 W generates a 0.238 W mid-infrared laser with a pump-idler conversion efficiency of 11.6%. It has tremendous application potential in the research of broadband CW mid-infrared lasers.
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