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太赫兹光学元件

作者: kevin    发布于: 2020-03-01 12:13    点击:

Terahertz optics

As part of a ready-made solution for terahertz imaging, Terasense offers TPX and PTFE lenses and optical systems operating in the THz range. Plastic plano-raised lenses are made of Polytetrafluoroethylene (Virgin White PTFE, Teflon®), which has a low dielectric constant of approximately 1.96 @ 520 GHz with an index of refraction of 1.4. The THz range can be communicated as the recurrence scope of 300 GHz to 10 THz or the wavelength scope of 30 μm to 1 mm.

Fig-12

Material: PTFE

  • Type: aspherical plano-convex condenser lense
  • Available diameter: 50 – 150 mm
  • Focal length: 50 – 300 mm
  • Diameter tolerance: +/- 1 mm
  • Clear aperture: >=80%
  • EFL tolerance: +/-5%
  • Surface quality, scr/dig 100/20
  • Surface accuracy, +/-0.1 mm
IMG_0234

Material: PTFE

  • Type: Two-lense optical system
  • Diameter: 120 mm
  • Distance between lenses: 85 mm
  • Effective focal length: 165 mm
  • Diameter tolerance: +/- 1 mm
  • Clear aperture: >=80%
  • EFL tolerance: +/-5%
  • Surface quality, scr/dig 100/20
  • Surface accuracy, +/-0.1 mm
thz_l_p1

Material: TPX

  • Type: plano-convex, bi-convex
  • Available diameter: up to 100 mm
  • Diameter tolerance: +/- 0.25 mm
  • Clear aperture: >=90%
  • EFL tolerance: +/- 1%
  • Surface quality (two-sided polishing), scr/dig 80/50
  • Surface accuracy: +/- 0.01 mm


Microwave and terahertz horn antennas

TeraSense offers quite a few models of terahertz and sub-THz sources (IMPATT diodes), Each THz source can be ordered either with respective WR- output flange or with rigidly fixed conical horn antenna. A detachable horn antenna is an optional add-on element, which can be attached to a respective WR- output flange. All in all, TeraSense offers a few types of horn antennas, as described below:

W-band antennas

Conical horn antenna for 100 GHz sources

 

 

Conical horn antenna for 100 GHz sources

    • Frequency range: available with 100 GHz; 140 GHz; 180 GHz sources
    • Beam shape: gaussian
    • Divergence angle: +/- 9 degrees
    • Gain: 20 dB
    • Mounting provisions: rigidly fixed inside impatt case
    • Weight: 0.059 kg (0.13 lbs)
    • Size: 39 x 16 mm (1,54’’ x 0.63’’ in)
    • VSWR typical: < 1.2

 

 

 

Detachable conical horn antenna for 100 GHz sources

 

 

Detachable conical horn antenna for 100 GHz sources

    • Frequency range: available with 100 GHz sources
    • Beam shape: gaussian
    • Divergence angle: +/- 7 degrees (WR-10), +/- 9 degrees (WR-8)
    • Output aperture diameter (average): 16 mm (WR-10), 12 mm (WR-8)
    • Gain: 25 dB (WR-10), 20 dB (WR-8)
    • Mounting option 1: attached to WR-8 output flange (UG387/UM)
    • Mounting option 2: attached to WR-10 output flange (UG387/UM)
    • Weight: 0.033 kg (0.072 lbs)
    • Size: 43 x 19 mm (1.7’’ x 0.75’’ in)
    • VSWR typical: < 1.2

 

 

F-band antennas

Detachable conical horn antenna for 140 GHz sources

 

 

Detachable conical horn antenna for 140 GHz sources

    • Frequency range: available with 140 GHz sources
    • Beam shape: gaussian
    • Divergence angle: +/- 7 degrees
    • Output aperture diameter (average): 10.4 mm
    • Gain: 25 dB (WR-6)
    • Mounting option: attached to WR-6 output flange
    • Weight: 0.02 kg (0.044 lbs)
    • Size: 29 x 19 mm (1.14’’ x 0.75’’ in)

 

 

Terahertz antennas

Detachable diagonal horn antenna for ~300 GHz  sources

 

 

Detachable diagonal horn antenna for ~300 GHz sources

    • Frequency range: available with ~ 280 GHz – 290 GHz sources
    • Beam shape: gaussian
    • Divergence angle: +/- 9.5 degrees
    • Output aperture diameter (average): 5 mm
    • Gain: 20 dB
    • Mounting option: attached to WR-3.4 output flange
    • Weight: 0.010 kg (0.023 lbs)
    • Size: 17 x 19 mm (0.65’’ x 0.75’’ in)

 

 

In configuration with horn antennas our THz sources are used to ‘couple’ radiation to free space (free space impedance). Such horn antennas considerably enhance THz beam generated by IMPATT diode and improve their stability.




Ultrafast Terahertz detectors

  • icon

    New physical principle employed

  • icon

    Response time < 150 ps

  • icon

    Operates at frequencies 0.05 – 0.7 THz

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    No power supply

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    Compact size: 20x30x7 mm

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    Low-cost

Terahertz detector description

Layer-88

Ultrafast detectors by TeraSense consistently demonstrate response time of less than 150 ps. This was confirmed by direct observation of its impulse response function. The detector was excited by 200 nJ 1 ps laser pulse with a broad spectrum ranging from 0.1 to 3 THz its response recorded by a high speed oscilloscope. The response function shows rise and fall times of 150 ps limited by the oscilloscope 4 GHz bandwidth.

The measured short response time makes it possible to use our detectors for straightforward investigation of fast transient processes in THz-science and telecommunication.

TeraSense® detectors are sensitive in a wide frequency range. However, their frequency response is not continuous, but consists of multiple bands (peak structures). The positions of the peaks on the responsivity curve can be tuned at the manufacturing stage to suit specific client’s requirements.

Our ultrafast high-sensitive sub-THz detectors are meant for exploring fast-changing and transient sub-THz signals and impulses. Terasense detectors are actually expediting the advent of ultra-high-speed wireless telecommunication networks which is about to happen in the near future. Terasense ultrafast detectors are also ultimate tools for characterization, calibration and tuning of impulse sub-THz sources.

Please note that in addicion to ultrafast detectors we can offer our FAST detectors, which are not so fast, but show much higher sensitivity (response time: 1 μs; sensitivity 10V/W).

Description / Specifications Sub-THz Detectors
  Ultrafast FAST
Response time: 150 ps 1 μs
SpectralRange 50 GHz – 0.7 THz 50 GHz – 0.7 THz
Responsivity (typical): 0.5 V/W 10 V/W
Noise Equivalent Power: 2 nW/√Hz 1 nW/√Hz
Dimensions: 23 х 29 х 6.5 mm 23 х 29 х 6.5 mm
Impedance: 50 Ω 10 kΩ
Output connector: SMA SMA




















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