SECOND HARMONIC GENERATION BY REFLECTION FROM GaAs
Abstract
The intensity of second harmonic light generated by reflection from a Gallium Arsenide Crystal is calculated in detail in four cases of polarization. Relevant properties of GaAs are stated and an experiment is described. Based on this, constitutive relations are written in the weak field approximation and the second and third order material tensors are reduced using crystal symmetry. The nonlinear wave equation is solved in the parametric approximation when phase matching is not present. The boundary value problems for the fundamental entering the medium and for the second harmonic leaving are solved. The only significant null solution is found to be the Brewster's angle extinction. Some numerical exploration of the exact effects of absorption at both fundamental and second harmonic are made. They are found to be small and are negligible for qualitative purposes unless the imaginary part of the dielectric constant exceeds the real part. Variation of intensity with crystal orientation is described in detail. The occurrence of phase matching as a null solution of the wave equation is seen to offer a natural approach to the problem of obtaining the geometry of phase matching for the most general optical medium.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 19, 1968
- Accession Number
- AD0666107
Entities
People
- James B. Langworthy
Organizations
- United States Naval Research Laboratory