Two-octave-wide (3-12  µm) subharmonic produced in a minimally dispersive optical parametric oscillator cavity

We report a subharmonic (frequency-divide-by-2) optical parametric oscillator (OPO) with a continuous wavelength span of 3 to 12 µm (-37 level) that covers most of the molecular rovibrational "signature" region. The key to obtaining such a wide spectral span is the use of an OPO with a min...

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Bibliographic Details
Published in:Optics letters 2021-02, Vol.46 (4), p.709-712
Main Authors: Ru, Q, Kawamori, T, Schunemann, P G, Vasilyev, S, Mirov, S B, Vodopyanov, K L
Format: Article
Language:English
Subjects:
Energy conversion efficiency
Gold coatings
Optical Parametric Oscillators
Parametric amplifiers
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Summary:We report a subharmonic (frequency-divide-by-2) optical parametric oscillator (OPO) with a continuous wavelength span of 3 to 12 µm (-37 level) that covers most of the molecular rovibrational "signature" region. The key to obtaining such a wide spectral span is the use of an OPO with a minimal dispersion-through the choice of intracavity elements, the use of all gold-coated mirrors, and a special "injector" mirror. The system delivers up to 245 mW of the average power with the conversion efficiency exceeding 20% from a 2.35 µm Kerr-lens mode-locked pump laser.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.403910