A Fiber-Laser Pumped, High-Power Terahertz Wave Source Based on Optical Rectification of Femtosecond Pulses in 4-Dimethylamino-N-methyl-4-stilbazolium Tosylate Crystal

Abstract

We demonstrate a compact, broadband, and high-power terahertz wave-generation scheme via optical rectification of femtosecond pulses in a 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal. We used a femtosecond fiber laser with a high repetition rate and an average power of a few hundred milliwatts to illuminate the DAST crystal. The terahertz waves emitted from the DAST crystal were measured using a calibrated pyroelectric sensor. We obtained an average power of 18 µW, more than two orders of magnitude greater than the average terahertz power emitted by a typical photoconductive antenna.