VARIATION OF REFRACTIVE INDEX DURING LASER OPERATION.
Abstract
Experimental determination of the effect of optical pumping on the refractive index of ruby in the region of anomalous dispersion surrounding the R sub 1 line requires a ruby sample of high optical quality. Shadowgraph and small-angle scattering measurements combined with some interferometric measurements in which the ruby serves as the spacer in a Fabry-Perot etalon indicate that a small Linde ruby in our possession has sufficient optical quality to allow accurate measurements of the minute index changes which are anticipated. Our experimental approach to measuring the refractive index changes requires photographing a set of Fabry-Perot fringes, whose relative positions are determined by the index changes, against a background set of fringes which serve as fiduciary marks. The feasibility of extracting quantitative information from the composite fringe patterns depends on the detailed spectral structure of the light which produces the fringes and also on rather critical control of relative exposure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1964
- Accession Number
- AD0603450
Entities
People
- H. A. Daw
- J. R. Izatt
- R. C. Mitchell
Organizations
- New Mexico State University