Enhancement of two-photon resonant third-harmonic generation of a CO/sub 2/ laser in gaseous CD/sub 4/

Third-harmonic conversion of a CO/sub 2/ laser in gaseous CD/sub 4/ with an efficiency enhanced by two orders of magnitude over that previously achieved is reported, and results which demonstrate the effectiveness of confining the nonlinear process in a hollow, dielectric waveguide are given. Power conversion efficiencies of 4.9*10/sup -4/ and 6.8*10/sup -3/ are attained in focused beam and waveguide experiments, respectively.<
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