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 Collimating lens

THz lenses

For THz beam guiding between the emitter and detector we offer hyperhemispherical and elliptic silicon lenses and aspheric TPX lenses with different diameter and focal length.

 Photo TPX lens

Silicon lenses

> HSL-12-7.1 - Hyperhemispheric silicon lens


  • The hyperhemispherical silicon substrate lens ensures a large solid angle Ω= 1.25 sr for the THz radiation in combination with a GaAs PCA chip.
  • Because this lens delivers a divergent THz beam it must be collimated by an additional lens.
• Diameter: 12 mm
• Thickness: 7.1 mm
• Refractive index: 3.41
• Material: undoped HRFZ-silicon
• Specific resistance: > 10 kΩcm
• Surface: polished
• PCA chip thickness: 0.6 mm
Data sheet (pdf)
• Price: 150.- €

> CSL-20 - Collimating silicon lens


The elliptic collimating silicon lens is designed for use in connection with a 0.6 mm thick antenna chip.

• Diameter: 20 mm
• Thickness: 13.8 mm
• Refractive index: 3.41
• Material: undoped HRFZ-silicon
• Specific resistance: > 10 kΩcm
• Flat and elliptic surface: polished
• PCA chip thickness: 0.6 mm
Data sheet (pdf)
• Price: 390.- €

> FSL-D20-f50 -Focusing silicon lens


Focusing elliptic silicon lens with 20 mm diameter and 50 mm focal length.

• Diameter: 20 mm
• Thickness: 14 mm
• Refractive index: 3.41
• Material: undoped HRFZ-silicon
• Specific resistance: > 10 kΩcm
• Flat and elliptic surface: polished
• PCA chip thickness: 0.6 mm
Data sheet (pdf)
• Price: 390.- €

Special TPX lenses for PCA from BATOP

  • Using highly transmissive TPX (Polymethylpentene) lenses the THz beam can be shaped.
  • One TPX lens can collimate the divergent THz beam coming from a hyperhemispherical substrate lens.
  • With a second TPX lens a sharp THz focus can be realized.
  • 1" diameter TPX lenses can be mounted easily onto a PCA with hyperhemispherical silicon lens,

> CTL-D25mm - Mounted collimating aspheric TPX lens with diameter 25.4 mm


• Lens diameter: 25.4 mm
• Maximum lens thickness: 8.0 mm
• Focal length: 32.5 mm
• Free aperture: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Absorption coeff: 0.3 cm-1
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
• PCA compatible housing
Data sheet (pdf)
• Price: 150.- €

> CTLF-D25mm - Mounted collimating aspheric TPX lens for fiber coupled PCA with diameter 25.4 mm


• Lens diameter: 25.4 mm
• Maximum lens thickness: 8.0 mm
• Focal length: 32.5 mm
• Free aperture: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Absorption coeff: 0.3 cm-1
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
• PCA compatible housing
Data sheet (pdf)
• Price: 150.- €

> FTL-f32.5mm - Focusing plano-convex TPX lens


• Lens diameter: 25.4 mm
• Maximum lens thickness: 8.0 mm
• Focal length: 32.5 mm
• Free aperture: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Absorption coeff: 0.3 cm-1
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
• Compatible with collimating lens
Data sheet (pdf)
• Price: 150.- €

TPX lenses with 1" and 2" diameter

List of available focusing plano-convex TPX lenses from stock. Other TPX lenses on request.

> TPX-D25.4-f10    , dedicated for spatial high resolution measurements   


• Lens diameter: 25.4 mm
• Focal length: 10 mm
• Free aperture diameter: 20 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.64
• Central lens thickness: 11.2 mm
• Edge thickness: 3.3 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €


• Asperic (elliptic) TPX lens
• Focal length: 10 mm
• Free aperture diameter: 20 mm
• F* number: 0.5
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.64
• Central lens thickness: 11.2 mm
• Material: TPX (Polymethylpentene)
• Spatial resolution at 1 THz: 0.3 mm
Spatial resolution measurement (pdf)
• Price unmounted: 130.- € / pc
• Price mounted: 150.- € / pc

> TPX-D25.4-f24    


• Lens diameter: 25.4 mm
• Focal length: 24.0 mm
• Free aperture diameter: 20.0 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.35
• Central lens thickness: 8.0 mm
• Edge thickness: 4.0 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f25    


• Lens diameter: 25.4 mm
• Focal length: 25.0 mm
• Free aperture diameter: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.38
• Central lens thickness: 8.0 mm
• Edge thickness: 3.1 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f32.5


• Lens diameter: 25.4 mm
• Focal length: 32.5 mm
• Free aperture diameter: 22.0 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.3
• Central lens thickness: 8.0 mm
• Edge thickness: 4.2 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f50    


• Lens diameter: 25.4 mm
• Focal length: 50.0 mm
• Free aperture diameter: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.21
• Central lens thickness: 7.0 mm
• Edge thickness: 4.4 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f67    


• Lens diameter: 25.4 mm
• Focal length: 67 mm
• Free aperture diameter: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.16
• Central lens thickness: 6.94 mm
• Edge thickness: 5.0 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f100


• Lens diameter: 25.4 mm
• Focal length: 100 mm
• Free aperture diameter: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.107
• Central lens thickness: 7.0 mm
• Edge thickness: 5.7 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D25.4-f150


• Lens diameter: 25.4 mm
• Focal length: 150 mm
• Free aperture diameter: 22.4 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.072
• Central lens thickness: 6.0 mm
• Edge thickness: 5.1 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 130.- €
• Price mounted: 150.- €

> TPX-D50.8-f65    


• Lens diameter: 50.8 mm
• Focal length: 65.0 mm
• Free aperture diameter: 47.8 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.33
• Central lens thickness: 13 mm
• Edge thickness: 4.1 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 220.- €
• Price mounted: 250.- €

> TPX-D50.8-f200


• Lens diameter: 50.8 mm
• Focal length: 200 mm
• Free aperture diameter: 47.8 mm
• Refractive index: 1.45 at 1 THz
• Numerical aperture NA: 0.12
• Central lens thickness: 8.3 mm
• Edge thickness: 5.0 mm
• Material: TPX (Polymethylpentene)
• Shape: plano-convex (aspheric)
Data sheet (pdf)
• Price unmounted: 220.- €
• Price mounted: 250.- €