We demonstrate the generation of mid-infrared radiation using a femtosecond dual-signal-wavelength optical parametric oscillator and difference frequency generation in an extracavity gallium selenide or silver gallium diselenide crystal. This system generates up to 4.3 mW of average mid-infrared power. Its spectra can be tuned to between 10.5 μm and 16.5 μm wavelength ($952{\mathrm{cm}}^{-1}–606{\mathrm{cm}}^{-1}$) with more than $50{\mathrm{cm}}^{-1}$ spectral bandwidth. We demonstrate that the power and spectra of this system are temporally very stable.

© 2012 Optical Society of America

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