Abstract

We report, for what is the first time to our knowledge, widely tunable mid-IR light generation over a range of greater than $1000\mathrm{nm}$ in the $4\mu \mathrm{m}$ region by employing a single quasi-phase-matched periodically poled niobate waveguide at room temperature. The waveguide we used was fabricated by annealed proton exchange based on periodically poled lithium niobate. A peak conversion efficiency of $10\%∕\mathrm{W}$ and a linewidth as small as $37\mathrm{MHz}$ were achieved. The developed mid-IR light generator may find wide applications in trace gas detection of multiple atmospheric species and high-resolution spectroscopy.

© 2007 Optical Society of America

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