TERA-AX. High-Intensity Terahertz Generator

High-intensity THz pulsed radiation generator pumped by commercial Ti:S ultrafast amplifiers.
THz output specifications
THz pulse energy >300* nJ
THz pulse duration 0.5-1 ps
Central frequency 1 THz
Spectral intensity bandwidth (FWHM) 1-1.5 THz
Repetition rate <3 kHz
THz beam divergence 45 mrad in vertical direction
100 mrad in horizontal direction
Dimensions 600 x 300 x 200 mm
Pump laser requirements
Pump pulse energy 0.5-2* mJ
Pump pulse duration <150 fs
Pump central wavelength 770...830 nm
EO-AX detector specifications (optional)
Scan range 180 ps
Spectral resolution 30 GHz
*- >1 uJ pulse energy upon request (required pump energy up to 8 mJ).


THz non-linear spectroscopy provides new information about atom, molecular, and solid-state fundamental resonances. Obviously THz non-linear measurements demand high-intensity THz sources. So far only a few studies on THz nonlinear spectroscopy have been done. Most of these studies were performed with THz pulses generated by Free Electron Lasers (FELs). However, extremely high cost of FELs significantly limits its wide use for the THz non-linear spectroscopy.

We offer the TERA-AX generator of ultra-short THz pulses (<1 ps)  providing up to 1 uJ THz pulse energy level. The TERA-AX requires pumping by a femtosecond Ti:S amplifier such as our REUS products. Other commercial femtosecond laser amplifiers also can be used for pumping. The system can be used for THz non-linear spectroscopy, large area THz imaging and other THz photonics purposes demanding high-energy ultra-short THz pulses. THz generation in the unit is based on phase-matched optical rectification in MgO:LiNbO3. The phase-matched condition is reached by tilting of femtosecond laser pulse fronts. Currently optical rectification with tilted femtosecond pulses provides highest rates of optical-to-THz conversion efficiency for Ti:S laser sources.

We also offer the Tera-Ax equipped with the optional EO-AX electro-optic detector providing measurement of electric field temporal profile of THz pulses. Amplitude and phase spectra of THz pulses can be obtained from temporal data by standard Fast Fourier Transform procedure.

Cryo-cooled setup modification may increase the efficiency even further, however, the complexity of the setup also increases.

800-nm pump - THz probe setup modification is also available.

A simpler (but less efficient) method of THz generation in air plasma may also be implemented upon request.



-CR: cryo-cooled version with increased efficiency
-PP: 800-nm pump - THz probe sample setup modification
-LA: large aperture version for higher output pulse energy and higher pump levels
-AP: air plasma generation version

Note: some of the modifications and options may be combined.

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