Idler Absorption Research Articles

Spontaneous parametric scattering, idler absorption, and dispersion in the nonlinear susceptibility in LiNbO3

Spontaneous parametric scattering, idler absorption, and dispersion in the nonlinear susceptibility in LiNbO₃

SPONTANEOUS PARAMETRIC SCATTERING OF LIGHT IN PROUSTITE

The spontaneous parametric scattering from ruby-laser-pumped proustite crystals has been investigated. By rotating the crystal, the signal wavelength was tuned from 0.7293 to 1.0875 μ corresponding to an idler wavelength range of 14.6 to 1.93 μ. Frequency tuning by varying the crystal temperature was found to be less efficient than for LiNbO3. Bandwidth and effect of idler absorption were also studied, and the effective nonlinear coefficients of proustite and LiNbO3 were compared.

FOUR-PHOTON OPTICAL PARAMETRIC NOISE IN WATER

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.