Relative Measurements of Tensor Components for Intrinsic and Induced Second-Order Nonlinear Susceptibilities in Glass Optical Fibers,
Abstract
To date, several models have been put forward in an attempt to explain second-harmonic generation (SHG) in glass optical fibers. We have in this paper measured some fundamental properties of the photoinduced SH light, in order to further elucidate the mechanism behind SHG in glass fibers. The electric quadrupole tensor, Which is of rank four, has only three independent components in glass; due to the constraints imposed by the waveguiding properties of the fiber only the ratio between two of them can be measured in this geometry. In addition we have measured the angular dependence of the intrinsic and induced SH light intensity as a function of input polarization. The data suggest that the induced SH light comes primarily from the initial electric quadrupole interaction and that growth occurs via improved phasematching. It has already been suggested that an increase in coherence length could explain the increase in the intensity of the SH light. The justification of such a statement is easily obtained from an order of magnitude calculation. In the literature it has been reported that the coherence length can be increased from 30 microns to 30 cm in specially prepared fibers.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1991
- Accession Number
- ADA240691
Entities
People
- J. W. Leitch
- R. I. Lawconnell
- U. Oesterberg
Organizations
- Air Force Research Laboratory