Accession Number : ADA337471

Title :   New Intense Light Source: Use of Dielectric Solids to Power Thermophotovoltaic Electric Generators and to Pump Lasers.

Descriptive Note : Final rept. 2 Jun-2 Dec 97,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : DeShazer, L. G. ; Kushch, A. S. ; Chen, K. C.

PDF Url : ADA337471

Report Date : 13 FEB 1998

Pagination or Media Count : 67

Abstract : A new light source using dielectric solids has been developed to power thermophotovoltaics (TPV) and to pump lasers. The light source is a refractory solid emitter heated to relatively high temperature by combustion. The dielectric solid was chosen to have selective thermal emission with nearly narrowband emission peaked at various visible and IR wavelengths. The combination of the selective emitter with an optical waveguide is called a 'superemissive light pipe" (SELP) and greatly increases its effectiveness. TPV was demonstrated by using an ytterbium garnet crystal SELP emitter powering a silicon photocell, and an erbium garnet crystal SELP emitter powering a GaSb photocell Thulium emitters were chosen to pump neodymium lasers, but no irrevocable cw laser action was observed, yet some enhanced 1064 nm emission was recorded.

Descriptors :   *DIELECTRICS, *LIGHT SOURCES, LASER PUMPING, EMISSION, HIGH TEMPERATURE, INTENSITY, CRYSTALS, SOLIDS, PIPES, COMBUSTION, OPTICAL WAVEGUIDES, SILICON, LIGHTWEIGHT, EMITTERS, GARNET, THERMAL RADIATION, ERBIUM, NARROWBAND, YTTERBIUM, NEODYMIUM LASERS, THULIUM, PHOTOELECTRIC CELLS(SEMICONDUCTOR).

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE