Accession Number : AD0603968

Title :   MANY ELEMENT LASERS.

Descriptive Note : Scientific rept. no. 1,

Corporate Author : FLORENCE UNIV (ITALY)

Personal Author(s) : Pratesi,R. ; Ronchi,L. ; Francia,G. Toraldo di

Report Date : APR 1964

Pagination or Media Count : 23

Abstract : Theoretical and experimental results are reported, obtained with a solid-state laser consisting of many active elements in series. A statistical treatment is developed to derive the oscillation conditions. Asymptotic expressions are given of the threshold gain per unit length holding either for a very large number of elements or for inner surface reflectivities close to 1. It turns out that lossless reflections at the inner surfaces can increase the cavity Q with respect to a one-element laser of the same active length. Preliminary experiments with five and ten-elements lasers demonstrate the mode selection property of the many element laser and show the tendency of the system to a 'quasi-continuous' emission. The possibility of obtaining some optical correction of the defects inherent in the solid material was also demonstrated. (Author)

Descriptors :   (*LASERS, SCIENTIFIC RESEARCH), REFLECTION, RODS, OPTICAL PROPERTIES, DIFFRACTION, AIR, OSCILLATION, SPECTROSCOPY, INTERFEROMETERS, RUBY, MATHEMATICAL ANALYSIS, ITALY

Distribution Statement : APPROVED FOR PUBLIC RELEASE