Accession Number : ADA086495


Title :   Optically Pumped Far Infrared Molecular Lasers.


Descriptive Note : Final rept. 1 Feb 76-31 Jan 80,


Corporate Author : ILLINOIS UNIV AT URBANA-CHAMPAIGN ELECTRO-PHYSICS LAB


Personal Author(s) : Coleman,Paul D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a086495.pdf


Report Date : Apr 1980


Pagination or Media Count : 138


Abstract : This report summarizes studies on optically pumped far infrared molecular gas lasers. The research has been concerned with the general subjects of far infrared integrated optics and technology, the discovery of new optically pumped molecular laser systems, and the study and analysis of nonlinear processes (Raman and hyper-Raman) that can occur in optically pumped systems. The theoretical density matrix analysis of the gain spectra of nonlinear systems and the first detailed experimental measurements of these systems are presented. It is demonstrated that third and fifth order nonlinear processes can exceed first order laser processes. An experimental study of the generation of a 22.653 GHz signal (the largest wavelength yet reported) in optically pumped NH3 is described. The frequency tunability and single shot spectral characteristics of the signal were measured with precision. A single laser pump in a four-level system can yield two laser signals, which in the linear case are not coupled together. However, with stronger pumping, nonlinear effects can couple the two laser signals with the result that the behavior of one laser signal is determined by the other and vice versa. The self-consistent analysis of this problem is described.


Descriptors :   *LASER PUMPING , *INFRARED LASERS , *NONLINEAR SYSTEMS , *RAMAN SPECTRA , *MOLECULAR LASERS , MEASUREMENT , EXPERIMENTAL DATA , LASER BEAMS , AMMONIA , FAR INFRARED RADIATION , PHOSPHINE , MOLECULAR ENERGY LEVELS , LASER MATERIALS


Subject Categories : Lasers and Masers
      Cybernetics
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE