Abstract-Interferometric Characterization of a Semiconductor Disk Laser driven Terahertz Source

Matthias Wichmann, 

Markus Stein, 

Arash Rahimi-Iman, 

Stephan W. Koch, 

Martin Koch

http://link.springer.com/article/10.1007%2Fs10762-014-0069-9

Michelson interferometry is used to investigate the pump-power dependent emission bandwidth of a THz emitter based on intra-cavity difference frequency generation in a two-color VECSEL. A multi-mode CW THz signal is found to result from the two simultaneously lasing groups of longitudinal VECSEL modes. Power-dependent experiments reveal a clear correlation between the THz signal bandwidth and the numbers of optical modes involved.