THz sources and detectors based on diode lasers

摘要

We demonstrate concepts for compact and cost effective THz technology based on semiconductor diode lasers. In detail, we analyze diode laser based THz sources and detectors. Continuous wave THz radiation is generated by two color diode lasers either with external photomixers or direct difference frequency generation in the diode laser. For time domain THz sampling applications we present a suitable mode-locked diode laser system. Further we present a method to detect THz radiation with diode lasers at room temperature: A THz signal coupled into the active region of a diode laser results in a variation of the voltage across the p-n-junction.