Contributions to Optical Nonlinearity in GaAs as Determined from Raman Scattering Efficiencies

Abstract

Values for the electro-optic and second-harmonic-generation coefficients $r_{41}$ and $d_{14}\left(\mathrm{SHG}\right)$ can be calculated from absolute spontaneous-Raman-scattering data alone. The ratio of electronic and lattice contributions to $r_{41}$, and the stimulated Raman gain coefficients for the LO and TO modes, may also be obtained. The technique is applied to GaAs and the value for $r_{41} \left[\right(1.5\mathrm{}\pm 0.1)\times {10}^{-12\mathrm{}}\frac{\mathrm{m}}{\mathrm{V}}]$ agrees with direct measurements, while the value for $d_{14}\left(\mathrm{SHG}\right) \left[\right(1.4\mathrm{}\pm 0.1)\times {10}^{-10\mathrm{}}\frac{\mathrm{m}}{\mathrm{V}}]$ is within the range of some direct SHG measurements.