Toptica has presented its compact, frequency-domain terahertz spectrometer. The system combines the company's TeraBeam, a highly integrated two-colour diode laser, with newly developed InGaAs/InP emitter and detector technology from the Fraunhofer Heinrich- Hertz Institute. The new cw THz system features a fast scan option, which reduces the acquisition times and acquires a complete THz spectrum in less than a minute. Making use of integrated DFB laser diodes and fibre components, the laser provides 30 mW per two-colour output and is therefore suited to the power requirements of the cw THz emitters and detectors. The emitter uses a high-bandwidth photodiode with an integrated waveguide structure and provides output levels in the microwatt range. The receiver employs an InGaAs photo­conductor and achieves good SNR values up to 80 dB. The modules are fully packaged with SM/PM fibre pigtails.

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