Characterization of continuous-wave terahertz sources: laser mixing versus backward-wave oscillators.
The tunable, continuous-wave terahertz (THz) radiation generated by mixing of two near-infrared laser lines in an antenna-coupled photomixer is compared with the monochromatic beam of backward-wave oscillators. The electromagnetic radiation of the different THz sources is characterized with respect to intensity, linewidth, degree of linear polarization, angular characteristic, beam quality, and M(2) value. The results are discussed with respect to applications in THz spectroscopy and imaging.
Martens
Stephan
S
Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany.
Gompf
Bruno
B
Dressel
Martin
M
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D055096:Optical Devices; D009991:Oscillometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000295:instrumentation*