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Applications » THz Imaging

THz imaging


THz Imaging THz imaging has the potential to provide safe and efficient means of providing these services. Unlike X-rays, THz waves are non-ionizing and present no risk to people. The THz (300μm<λ<3mm) range lies between millimetre radio waves and far infrared light waves and exhibits properties from both sides of the electromagnetic spectrum.

 

 

However, THz screening commercialization has been slowed by the lack of a source of high-power THz pulses. This project is aimed at developing a source delivering 100 to 1 000 times more power than other approaches in the marketplace or currently in research and development. The same source may enable a broad range of ultra high bandwidth THz signal processing applications.

The attraction of THz imaging lies in its ability to produce phase-sensitive spectroscopic images, which holds the potential for target identification. THz systems are ideal for imaging dry dielectric substances, including paper, plastics and ceramics. These materials are relatively non-absorbing in this frequency range, yet different materials may be easily discriminated based on their refractive index.

THz Imaging
 
THz A THz system based on SDILasers’ technology gives the user the ability to scan objects at a much higher rate than any other compatible system due to high repetition rate and high pulse energy. In addition, the tunability of the system allows the user to detect or identify a wide variety of substances or chemicals due to THz molecular rotations and fluctuations enabling molecules to be identified.
 
The specifications and parameters of a typical THz imaging system based on SDILasers technology are given below:
 

 Laser Sub-system

2 x WH30

   Pulse Energy

2 x 1J

   Repetition Rate

30Hz

   Pulselength

~100ns

   Average Power

2 x 30W

   Peak power

13MW

   Beam Dimensions

15mm x 15mm

 Optical Sub-system

 

   Propagation

Enclosed, multiple mirror beam steerers, with inline telescope and focussing system

    Optics

High reflectivity, high damage threshold coated Cu mirrors

   Conversion

GaAs

 Performance

 

  Output Power

~4kW

   Wavelength Region

0.5 – 3.0THz

   Wavelength step
40GHz
 
 
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