Time Domain THz Spectrometers
The famous Rensselaer Polytechnic Institute in Troy USA has a long history of developing new processes for THz spectroscopy. Its achievements are now made commercially available by Zomega Terahertz.
The compact Time Domain THz Spectrometer Mini-Z has a femtosecond fiber laser as pulse source. Its operating modes are transmission and focused reflection. Weighing less then 3 kilos, the THz head is highly flexible and ideal for various applications. A GaAs antenna with integrated silicon collimator serves as antenna. An electro optical ZnTe crystal in combination with 2 photodiodes and a balance detector is used to detect the THz signal. The sampling rate is standard 10 Hz in a spectral range from 0,1 to 4 THz. The new HR model measures at 500 Hz.
The new hand held Micro-Z also has a sampling rate of 500 Hz. It is used to identify substances from the distance for example on top of a conveyor belt or in saftey applications.
The larger Time Domain Z-3 THz spectrometers require an external femtosecond laser source. The system is highly flexible and offers many options to the THz user for example opticalpump/THz probe or XY imaging. Depending on the pulse laser the dynamic range reaches 70 dB @ 5 GHz resolution.
The ZAP-THz Air Photonics uses an air plasma created in the focus of an amplified fs Ti:sapphire laser to generate the THz radiation. Due to the short pulse < 50 fs a broader spectral range is accessable 0.1-10 Thz.
The newest Zomega time domain THz spectrometer FICO is equipped with fiber coupled emitter and detector. It uses the superior electro optical sampling technique where changes of the polarization of the reference beam are detected with high sensitivity in an EO crystal using the Pockels effect. The sampling rate is high at 500 frames/sec This paves the way towards more industrial use. Due to fiber coupling flexible sample geometries are possible.
A series of standard THz optics, TPX, HPDE, Si are offered with short delivery, as well as modules like HV modulator and ZAP air plasma detection.
Tunable THz source 0.8 – 2.5 THz