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Title: The sapphire Cerenkov laser

Abstract

The theory and experimental performance of the Cerenkov Free Electron Laser (CFEL) is treated. Emphasis is on low-voltage (less than 100 keV) operation. The CFEL is an electron beam drive, dielectric resonator based source of tunable radiation. The Cerenkov mechanism for spontaneous emission is introduced. Geometric optics and electromagnetic theory are invoked to determine the critical resonator properties of a device designed to produce stimulated emission. The gain is quantified by adapting the dimensionless FEL formalism for the first time to low energy CFEL's. Saturation and power are explored by extending the dimensionless equation of motion. The experimental results for sapphire planar resonators are presented. The experiments corroborate the theoretical predictions in all cases. Radiation was also obtained from lanthanum aluminate, quartz, boron nitride, and stycast and these results are discussed briefly. The lack of any radiation from silicon resonators is explained. The sapphire CFEL has produced up to 100 W of radiation in a approximately 1 microseconds pulse at wavelengths ranging from 3.7 to 1.4 mm (80 to 220 GHz). The sapphire Cerenkov laser could be adapted for far-infrared output (100 microns/1 mm) using the theory presented to determine the design parameters.

Authors:
Publication Date:
Research Org.:
Dartmouth Coll., Hanover, NH (United States)
OSTI Identifier:
7069497
Alternate Identifier(s):
OSTI ID: 7069497
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Ph.D. Thesis
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; FREE ELECTRON LASERS; DESIGN; PERFORMANCE TESTING; ALUMINATES; BORON NITRIDES; CHERENKOV RADIATION; ELECTROMAGNETISM; EQUATIONS OF MOTION; LANTHANUM; QUARTZ; RESONATORS; SAPPHIRE; SILICON; STIMULATED EMISSION; ALUMINIUM COMPOUNDS; BORON COMPOUNDS; CORUNDUM; DIFFERENTIAL EQUATIONS; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; ELEMENTS; EMISSION; ENERGY-LEVEL TRANSITIONS; EQUATIONS; EQUIPMENT; LASERS; MAGNETISM; METALS; MINERALS; NITRIDES; NITROGEN COMPOUNDS; OXIDE MINERALS; OXYGEN COMPOUNDS; PARTIAL DIFFERENTIAL EQUATIONS; PNICTIDES; RADIATIONS; RARE EARTHS; SEMIMETALS; TESTING 426002* -- Engineering-- Lasers & Masers-- (1990-)

Citation Formats

Fisch, E.E. The sapphire Cerenkov laser. United States: N. p., 1991. Web.
Fisch, E.E. The sapphire Cerenkov laser. United States.
Fisch, E.E. Tue . "The sapphire Cerenkov laser". United States.
@article{osti_7069497,
title = {The sapphire Cerenkov laser},
author = {Fisch, E.E.},
abstractNote = {The theory and experimental performance of the Cerenkov Free Electron Laser (CFEL) is treated. Emphasis is on low-voltage (less than 100 keV) operation. The CFEL is an electron beam drive, dielectric resonator based source of tunable radiation. The Cerenkov mechanism for spontaneous emission is introduced. Geometric optics and electromagnetic theory are invoked to determine the critical resonator properties of a device designed to produce stimulated emission. The gain is quantified by adapting the dimensionless FEL formalism for the first time to low energy CFEL's. Saturation and power are explored by extending the dimensionless equation of motion. The experimental results for sapphire planar resonators are presented. The experiments corroborate the theoretical predictions in all cases. Radiation was also obtained from lanthanum aluminate, quartz, boron nitride, and stycast and these results are discussed briefly. The lack of any radiation from silicon resonators is explained. The sapphire CFEL has produced up to 100 W of radiation in a approximately 1 microseconds pulse at wavelengths ranging from 3.7 to 1.4 mm (80 to 220 GHz). The sapphire Cerenkov laser could be adapted for far-infrared output (100 microns/1 mm) using the theory presented to determine the design parameters.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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