Time-resolved measurement of signals in terahertz time domain spectroscopy requires two variable laser pulses with a time delay between them. Until now, a mechanical displacement unit or two light sources achieve the necessary time delay. We have built a laser system working without a mechanical positioning unit and just one laser. Introducing the SLAPCOPS system.
The majority of systems developed and in use now in our department are based on ultrashort pulsed lasers in conjunction with optical delay units. These two components are necessary to record processes on a scale of picoseconds. (One second consists of a trillion picoseconds, a time scale that currently cannot be achieved with electronic systems). Terahertz pulses are electromagnetic pulses lasting one picosecond, which enable a thickness analysis of multi-layer coatings like automobile paint, in a non-contact and non-destructive manner – a fundamental advantage over other technologies.