Abstract
In this paper, a novel high efficient dual-wavelength mid-infrared optical parametric oscillator (OPO) was demonstrated, which was pumped by a dual-wavelength Raman fiber oscillator for the first time. The adoption of oscillator structure reduced the waste of power, increased Raman pump power and promoted its frequency conversion. The dual-wavelength pump source was fixed at 1070 nm and 1120 nm and the Raman conversion efficiency was greatly enhanced from 26.7% to 72.1%. The high Raman efficiency and low Raman threshold enabled the Raman laser to build optical parametric oscillation easily and the pump-to-idler conversion efficiency of Raman laser improved greatly from 4.2% to 13.3%. The generated dual-wavelength mid-infrared laser was fixed at 3272 nm and 3663 nm, with a maximum power of 6.87 W, indicating a 13.9% pump-to-idler conversion efficiency. The highest mid-infrared output power generated by optical parametric oscillation of Raman laser was also achieved, which is almost ten times than before.
Highlights
Dual-wavelength mid-infrared optical parametric oscillator (OPO) can simultaneously generate mid-infrared emission with different wavelengths, which have great application value and prospects in THz generation, remote sensing and material detection [1]–[4]
The passive fiber used was shortened from 137 meters to 35 meters, which means the scheme was much more efficient
It can be seen that just like traditional Raman fiber oscillators, the power was transferred to Raman laser rapidly, and made the Raman conversion efficiency grew continuously and reached maximum at 72.1%, which was almost as 3 times high as that in the Ref. [16]
Summary
Jiacheng Feng ,1,2,3 Peng Wang ,1,2,3 Xi Cheng ,1,2,3 Xiao Li ,1,2,3 Weihong Hua, and Kai Han 1,2,3.
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