Accession Number : ADA130729

Title :   Coherent Propagation and Sum Frequency Generation into the Vacuum Ultraviolet.

Descriptive Note : Final rept. 1 Nov 81-31 Oct 82,


Personal Author(s) : Diels,Jean-Claude

PDF Url : ADA130729

Report Date : 31 Oct 1982

Pagination or Media Count : 15

Abstract : An experimental and theoretical study of resonant coherent four wave mixing has been initiated. Prior theoretical investigation by the author has demonstrated that coherent propagation effects can be used to keep all the energy in the radiation field, even in the presence of resonant absorption. An energy conversion efficiency of 6% was predicted for third harmonic conversion in lithium to 190 nm. In the period covered. (1) Constructed a dye laser amplifier, and achieved an output of 1 mJ for wavelengths covering the most important resonances of lithium (571 nm, 672 nm, 639 nm); (2) Purchased and assembled the hardware of a data acquisition system to accurately characterize each pulse (amplitude, duration, phase modulation) and perform the measurement of two photon absorption and third harmonic as a function of the relative phase and delay in the pulse sequence; (3) Investigated the feasibility of increasing the conversion efficiency through the use of natural or induced autoionizing resonances; and (4) Made a theoretical study of the influence of coherence on three photon ionization in lithium.

Descriptors :   *Coherent electromagnetic radiation, *Wave propagation, *Vacuum ultraviolet radiation, Metal vapors, Photons, Harmonic generators

Subject Categories : Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE