ELECTRONICS RESEARCH PROGRAM. SELECTION OF OSCILLATION MODES IN OPTICAL MASERS
Semiannual technical rept. 1 July-31 Dec 1962
AEROSPACE CORP EL SEGUNDO CA
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Ruby lasers formed by butting together two laser rods with plane parallel ends were shown to possess mode selection properties. The interface between the rubies acts as a partially-transparent reflector. Calculations show that the favored axial modes of the structure correspond to the frequencies for which both rods possess a Fabry-Perot type of resonance. The experimental results are in good agreement with these predictions. At high input energy about 2-12 times threshold a structure, consisting of a 3 inch and a 1-14 inch rod, was observed to oscillate in only three axial modes at room temperature. The reflectivity of the internal reflector and one ruby end face is obtained by virtue of the rubyair dielectric discontinuity. The other end, which is totally reflecting, may be either a chisel or a prism. Thus, the type of mode selectivity afforded by the segmented rod structure is well adapted for very high power applications.
- Lasers and Masers