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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 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.
Absolute frequencies of an acetylene-stabilized laser at 1542 nm and an iodine-stabilized Nd:YAG at 1319 nm are measured at their second harmonics by use of a femtosecond optical comb based on a mode-locked Ti:sapphire laser. A frequency measurement system based on a mode-locked fiber laser (1.56mum) is also being developed for metrological applications in the telecommunication bands
We observed a 200-nm spectrum broadening of the third harmonics (520 nm) of an Er-doped mode-locked fiber laser (1560 nm) based on cross-phase modulation in a photonic crystal fiber.
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