Abstract

A wide tuning technique for mid-IR difference-frequency generation (DFG) with uniform grating periodically poled ${\mathrm{LiNbO}}_3$ (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 $690\mathrm{nm}$ is experimentally achieved with fiber laser fundamental lights.

© 2010 Optical Society of America

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