FOUR-PHOTON OPTICAL PARAMETRIC NOISE IN WATER

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Abstract
Optical parametric noise has been produced in a centrosymmetric medium, water, by a 9‐MW ruby laser beam. The wavelengths, in the visible, and the angles of emission agree with the tuning curve calculated for a phase‐matched four‐photon process. A power of ≈½μW emitted into a 38‐Å band is observed in the low‐loss wavelength range, in approximate agreement with theory. Very strong idler absorption has little apparent effect on the signal power or bandwidth.