Accession Number : ADA113659

Title :   Low Voltage Free Electron Laser Optics.

Corporate Author : SCHAFER (W J) ASSOCIATES INC WAKEFIELD MA

PDF Url : ADA113659

Report Date : 05 Mar 1982

Pagination or Media Count : 59

Abstract : We investigated several methods of reducing the pump cavity losses in a two stage free electron laser. We have found that with metal optics, we can reduce the round trip cavity absorption losses to approx. = 0.2% with some difficulty. The cavity wall losses can be significantly decreased by resorting to superconducting optics. The limitations of this system is that the operating wavelength has to be a few millimeters and the operating temperature has to be 2 deg K to keep the refrigeration power at a reasonable level. One has also to pay the price of the complexity of the system. For near term UCSB experiment, it was felt that room temperature silver coated optics would be the best choice. To expand the optical beam to low flux levels that the mirrors can handle, it was necessary to use near concentric resonator geometry. For such a configuration, the diffraction losses could be maintained .0001 by choosing Fresnel number greater than or equal to 15.

Descriptors :   *Electrical lasers, *Free electrons, *Pumping(Electronics), Laser cavities, Low loss, Radiation absorption, Permanent magnets, Samarium intermetallics, Cobalt alloys, Optical coatings, Laser materials, Laser spots, Control

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE