Terahertz Spectroscopy

High-speed time-domain spectroscopy solutions

About Terahertz Spectroscopy

Today Terahertz (THz) spectroscopy is used in many areas of science, security, and product testing. Terahertz (THz) radiation sits between the infrared and microwave regions of the electromagnetic spectrum, but unlike UV/Vis or IR spectroscopy, there are currently no competitive straight forward methods capable of measuring absorption in a conventional way. The answer is to use time domain-based THz spectroscopy (THz-TDS), where the frequency spectrum is derived from Fast Fourier Transformation from a transient in the time-domain.


Typically, THz-TDS is based on ultrashort laser pulses from a mode-locked laser for the generation of ultrashort THz pulses and delayed probe pulses for phase-sensitive detection of the radiation. One drawback of conventional THz-TDS systems is the use of mechanical delay stages to realize the time delay between the THz pulse and the optical detection pulse. This leads to an inherently low acquisition rate for THz transients.


To this end, a conventional THz-TDS system needs a mechanical delay stage with a travel distance of 15 cm. The time required for accelerating and decelerating the stage between approximately 10,000 data points and to average out technical laser noise typically leads to a total acquisition time in the range of a few tens of minutes. Hence, applications, where the acquisition of a THz trace should be completed within a few seconds or even milliseconds, are impossible.


Within the Novanta range, we can remove some of these pain points:


  • High-speed time-domain spectroscopy solutions based on ASOPS overcome the need for a mechanical delay stage
  • Large area THz emitters for the efficient and easy to use generation of THz radiation
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