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A frequency-stabilized infrared comb for precision frequency measurements in the region of 1 - 2 /spl mu/m

An all-solid-state Kerr-lens mode-locked Cr4+:Mg2 SiO4 (Cr:forsterite, Cr:F) laser operating at a central wavelength of 1.25 mum has been constructed and characterized for frequency metrology applications. The pulse repetition rate of the laser was phase-locked to an H-maser-referenced oscillator. The laser's operational wavelength range has been extended from 1 to 1.7 mum by means of a spectral broadening of unamplified 40 fs pulses in a highly nonlinear optical fiber. A feasibility to employ the resulting comb of equidistant optical frequencies for frequency measurements in the infrared has been demonstrated