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We measure the carrier envelope offset frequency of a degenerate optical parametric oscillator. We verify that it has half the value of the pump frequency comb, and sub-Hertz level relative linewidth.
We combine a Tm-fiber frequency comb, phase-locked doubly-resonant GaAs optical parametric oscillator, multipass cell, and Fourier transform spectrometer to measure comb-resolved spectra at wavelengths of 3.1 to 5.5 micrometers for multiple gases at trace concentrations.
We demonstrate that the carrier-envelope offset frequency of a mid-infrared frequency comb from a nondegenerate and doubly-resonant GaAs-based optical parametric oscillator is locked to that of the 2 μm thulium-fiber pump laser.
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