|Download Impulse Terahertz Time-Domain Spectrometer THz TDS-2 Datasheet (PDF, 1 MB)|
Terahertz Time-Domain Spectrometer THz TDS-2 by TYDEX is integrated solution for broadband terahertz time-domain spectroscopy. Due to the use of femtosecond laser radiation, the spectrometer measures the time shape of the THz pulse using the electro-optical strobing. Then the shape is converted via Fourier transformation into the frequency spectrum of the complex amplitude of the electric field of THz pulse (It contains amplitude and phase information.) Thus, using the THz TDS-2 it is possible to obtain the spectral characteristics (such as transmission and reflection coefficients) and optical properties (complex refractive index, complex dielectric permittivity, absorption coefficient, complex conductivity) of materials in THz frequency range. THz TDS-2 offers high THz radiation power and wide operating frequency range.
To generate and register THz radiation, THz TDS-2 uses an IR radiation source, namely, a femtosecond laser Avesta TEMA-100. THz TDS-2 generates THz radiation by means of optical rectification of electric field of a femtosecond pulse in a lithium niobate crystal doped with magnesium oxide (MgO:LiNbO3). Terahertz impulse is released through a prism of high-resistivity silicon (HRFZ Si). THz radiation is then detected by means of electro-optical strobing using a delay line and electro-optical detector EOD-NIR (manufactured by TYDEX).
Fig. 1. THz TDS-2 layout diagram.
Generation and detection of the THz radiation is performed as follows. Laser radiation is split into a pumping beam and probing beam.
Pumping beam is focused into the THz generator (MgO:LiNbO3 crystal).
THz radiation emitted from the generator passes through a set of parabolic off-axis mirrors. Consistently the THz beam becomes collimated and focused. Further the THz radiation is focused into the detecting EOD crystal.
Probing beam passes through the optical delay line, then is focused and overlaid with the THz radiation beam on the detecting EOD crystal.
The software controls recording and processing of the THz impulse waveforms.
Key features of the THz TDS-2:
Applications of the THz TDS-2:
Operating modes of the THz TDS-2:
Key specifications of the THz TDS-2:
|Frequency range||0.2-3 THz|
|Maximum time delay||450 ps|
|Dynamic range||no less than 40 dB|
|Spectral resolution||no more than 40 GHz|
|Centre wavelength||1049 nm|
|Impulse duration||90 fs|
|Repetition rate||70 MHz|
|Average power||5,0 W|
|THz radiation source type||MgO:LiNbO3|
|Prism material||HRFZ Si|
|Average radiation power||no less than 100 µW|
|Electro-optical shutter modulation frequency||60 – 3000 Hz|
|Delay line length||150 mm|
|Delay line step||2.5 µm|
Fig. 2. Waveform of a THz impulse passing through air at 34% humidity.
Fig. 3. Frequency spectrum of the air at 34% humidity.
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