ABSTRACT
Fifteen new, Raman far-infrared (FIR) laser emission lines in CH(3)F have been excited by optically pumping up to 24 GHz off resonance with high-intensity CO(2) TEA laser radiation (up to 20 MW/cm(2)). Most of these new lines are produced with high quantum efficiency in a waveguide laser system. High-intensity laser pumping could also be applied to other gases to produce many new, efficient lines. The present results suggest that a nearly continuously tunable source of FIR radiation in the 175-500-microm range could be obtained through Raman laser emission in CH(3)F using a tunable, multiatmospheric CO(2) pump laser.
ABSTRACT
A system of coupled tunnel diode relaxation oscillators shows a variety of complex periodic states as the external voltage is varied. The existence of chaotic or nonperiodic states is more dependent on the nature of the coupling than on the number of degrees of freedom. A simple but accurate numerical model shows many of the phenomena observed experimentally.