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Opt Lett. 2010 Oct 15;35(20):3486-8. doi: 10.1364/OL.35.003486.

Widely tunable mid-IR difference-frequency generation based on fiber lasers.

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1
Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei, 230031, China.

Abstract

A wide tuning technique for mid-IR difference-frequency generation (DFG) with uniform grating periodically poled LiNbO(3) (PPLN) is presented. Based on the dispersion property of the PPLN, the quasi-phase matching (QPM) band for the pump can evolve to two separate bands, and the spacing between them can be increased with the decrease of the crystal temperature. Two such separate QPM bands can be used for increasing the idler tuning range when the crystal temperature is set to adapt the pump tuning. With the technique, an idler tuning range of 690nm is experimentally achieved with fiber laser fundamental lights.

PMID:
20967108
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