A continuous-wave optical parametric oscillator around 5-μm wavelength for high-resolution spectroscopy.

@article{Krieg2011ACO,
  title={A continuous-wave optical parametric oscillator around 5-$\mu$m wavelength for high-resolution spectroscopy.},
  author={J{\"u}rgen Krieg and Andr{\'e} Klemann and I. Gottbeh{\"u}t and Sven Thorwirth and Thomas F. Giesen and Stephan Schlemmer},
  journal={The Review of scientific instruments},
  year={2011},
  volume={82 6},
  pages={
          063105
        }
}
We present a continuous-wave optical parametric oscillator (OPO) capable of high resolution spectroscopy at wavelengths between 4.8 μm and 5.4 μm. It is based on periodically poled lithium niobate (PPLN) and is singly resonant for the signal radiation around 1.35 μm. Because of the strong absorption of PPLN at wavelengths longer than 4.5 μm, the OPO threshold rises to the scale of several watts, while it produces idler powers of more than 1 mW and offers continuous tuning over 15 GHz. A… 
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