Solid-State Laser Wavelength Identification using a Reference Absorber.
Abstract
A Fabry-Perot etalon is used to identify the relative wavelengths of individual spikes in the long-pulse output of a homogeneously broadened, solid-state laser. This identification is accomplished by positioning one side of a low finesse etalon bandpass such that it is coincident with the laser output. Different wavelength spikes experience different attenuations on passing through the etalon, thus enabling a relative wavelength determination from the etalon transmission value. The etalon is incorporated into a real-time minicomputer controlled measuring system capable of storing, analyzing, and displaying various parameters encountered in laser interaction studies. By utilizing the narrow spectral width of individual laser spikes (< 0.0001 nm) and the large number of different wavelength spikes available in a single long pulse (tens to hundreds), many high-resolution spectral data points can be obtained within the period of one laser shot (< 4 ms). Experimental results of the transmission of erbium: YAG laser radiation in a methane-enriched atmosphere are shown to illustrate one use for the system. This technique provides an accurate means of studying the interaction and propagation nature of certain solid-state lasers used by the Army. The causes of degradation in Army laser systems may be studied with a higher degree of precision, thereby allowing possible minimization or elimination of any such effects. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA041689
Entities
People
- Kenneth O. White
- Ronald L. Johnson
- Stuart A. Schleusener
- Wendell R. Watkins
Organizations
- United States Army Communications-Electronics Command