Kijun Park

US Patent:

57843970, Jul 21, 1998

Filed:

Nov 16, 1995

Appl. No.:

8/558440

Inventors:

Jin J. Kim - Winter Springs FL
Robert E. Peale - Oviedo FL
Kijun Park - Orlando FL

Assignee:

University of Central Florida - Orlando FL

International Classification:

H01S 318
H01S 330
H01S 300
H01S 3083

US Classification:

372 43

Abstract:

A p-Ge laser operating at submillimeter wavelengths in Voigt configuration using a regular permanent magnet. The invention is improvement over prior art Ge Lasers which use superconducting magnets that require liquid helium to cool the magnets along with the Ge crystal. Although the subject invention requires cooling(refrigerant) of the Ge crystal itself, it does not need liquid helium. The permanent magnet can be Nd. sub. 2 Fe. sub. 14 B. The emissions using the novel invention were observed over a wider range of electric-field magnitude in Voigt configuration at a given magnetic field as compared to that of the prior system. The free space beam profile of the subject invention is Gaussian. The emission-strength of the subject invention is sufficient between 4 and 10K that a closed-cycle refrigerator can be used to cool the crystal rather than the liquid helium used in all prior p-Ge lasers. The open architecture of the permanent magnet facilitates use of cooling fins/heat sinks, which are demonstrated to increase repetition rate and energy output over all prior p-Ge lasers, which do not use such.