Low-power cw generation of coherent anti-Stokes Raman radiation in CH4 gas

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Abstract
Coherent continuous wave anti‐Stokes Raman scattering has been observed using a fixed‐frequency pump beam (at the argon laser wavelength 514.53 nm) and a tunable‐frequency Stokes beam (provided by a dye laser at 605.41 nm) focused in a cell containing 1 atm of CH4 gas. This four‐frequency mixing experiment utilized the ν1 symmetric vibrational mode in CH4 at 2916.7 cm−1, resulting in a coherent anti‐Stokes signal at 447.37 nm. The power measured in the 514.53‐nm pump beam was 0.46 W and the effective power in the Stokes beam was calculated to be about 36 mW. The calculated coherent anti‐Stokes power of 2.18×10−13 W agrees very well with the experimentally observed anti‐Stokes power.