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.
Continuous-wave CO2 laser radars have generally been considered for the task of detecting moving targets (MTI).1 After acquiring a target the object could then be imaged by a pulsed-ranging laser radar. However, it is also possible to image the target in Doppler space with a cw laser. A high-resolution velocity image contains a great deal of information useful for target classification. The advantage over conventional imaging systems is the ability to reject stationary background clutter.
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