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Imaging with an Ultra-High Repetition Rate Terahertz Time-Domain Spectroscopy System Driven by a Mode-Locked Laser Diode

Mode-locked laser diodes (MLLDs) are attractive as light sources for compact terahertz time-domain spectroscopy (THz-TDS) systems for imaging applications. A great advantage of their ultra-high repetition rate is that objects can be imaged at arbitrary distances independent of the length of the optical delay unit (ODU) of the spectrometer. The downside of the ultra-high repetition rate is that it generates only a small unambiguous imaging window. In this work, we show first images acquired with a THz-TDS system driven by a MLLD.