An all-polarization-maintaining fiber-type infrared DFG comb with wide bandwidth and high conversion efficiency

Chinese Journal of Quantum Electronics ›› 2019, Vol. 36 ›› Issue (4): 428-433.

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An all-polarization-maintaining fiber-type infrared DFG comb with wide bandwidth and high conversion efficiency

MA Jindong1,2, LU Qiao2, DUAN Dian2, YAO Bo2, MAO Qinghe1,2

1 School of Environmental Science & Optoelectronic Technology, University of Science and Technology of China, Hefei, 230026, China 2 Anhui Provincial Key Laboratory of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China

Received:2018-12-03 Revised:2018-12-04 Published:2019-07-28 Online:2019-07-11
Contact: 毛庆和(1963—)，男，研究员，博士生导师，主要从事纤维光学、激光物理与器件及其应用技术等方面的研究。 E-mail:mqinghe@aiofm.ac.cn

Abstract

Abstract: A broadband difference frequency generation (DFG) comb with high conversion efficiency based on a mode-locked Erbium-doped fiber laser and GaSe crystal is presented in this paper. All-polarization-maintaining fiber structure is used to obtain high degrees of linear polarizations, and the nonlinear pulse fiber amplification technique is utilized to achieve wide bandwidths, short durations and high peak powers, for the two-color fundamental pulses. This offers the DFG comb the properties of wide bandwidth and high conversion efficiency, the DFG process very stable. The experimental results show that, the achievable bandwidth of the DFG comb near 8.15 μm reaches 1.7 μm, only limited by the phase-matching acceptance bandwidth of the crystal; the DFG conversion efficiency is as high as 1%, much higher than that for the fiber-type DFG comb reported so far, which is about 0.4%.

Key words: optical frequency comb (OFC), difference frequency generation (DFG), polarization-maintaining (PM) fiber, laser pulse

CLC Number:

O437

References

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An all-polarization-maintaining fiber-type infrared DFG comb with wide bandwidth and high conversion efficiency

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