We demonstrate a resonant external cavity approach to enhance narrowband terahertz radiation through differencefrequency generation for the first time (to our knowledge). Two nanosecond laser pulses resonant in an optical cavity interact with a nonlinear crystal to produce a factor of 7 enhancement of terahertz power compared to a single-pass orientation. This external enhancement approach shows promise to significantly increase both terahertz power and conversion efficiency through optical pump pulse enhancement and effective recycling.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics