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Shanghai Tera photoelectric Technology provide non-spherical TPX lenses of different specifications
THz Lens, Aspherical TPX Lens, with a diameter of 1 inch and a focal length of 10 mm
TPX-D25.4-f10 
Lens Diameter:25.4 mm
Focal Length:10 mm
Clear Aperture:20 mm
F* Number: 0.5
Refractive Index:1.45 at 1 THz
Numerical Aperture(NA):0.64
Center Thickness:11.2 mm
Material:TPX (Polymethylpentene)
Spatial Resolution@ 1 THz: 0.3 mm
Shape:Flat-Convex (Aspheric)
THz Lens, Aspherical TPX Lens, with a diameter of 1 inch and a focal length of 15 mm
TPX-D25.4-f15 
Lens Diameter:25.4 mm
Focal Length:15.0 mm
Clear Aperture: 23.4 mm
Refractive Index:1.45 at 1 THz
Numerical Aperture(NA):0.59
Center Thickness:8.0 mm
Edge Thickness:1.6 mm
Material:TPX (Polymethylpentene)
Shape:Flat-Convex (Aspheric)
THz Lens, Aspherical TPX Lens, with a diameter of 1 inch and a focal length of 25 mm.
TPX-D25.4-f25 
Lens Diameter:25.4 mm
Focal Length:25.0 mm
Clear Aperture: 22.4 mm
Refractive Index:1.45 at 1 THz
Numerical Aperture(NA):0.38
Center Thickness:8.0 mm
Edge Thickness:3.1 mm
Material:TPX (Polymethylpentene)
Shape:Flat-Convex (Aspheric)
THz Lens, Aspherical TPX Lens, with a diameter of 1 inch and a focal length of 32.5 mm.
TPX-D25.4-f32.5 
Lens Diameter:25.4 mm
Focal Length:32.5 mm
Clear Aperture: 22.0 mm
Refractive Index:1.45 at 1 THz
Numerical Aperture(NA):0.3
Center Thickness:8.0 mm
Edge Thickness:4.2 mm
Material:TPX (Polymethylpentene)
Shape:Flat-Convex (Aspheric)
THz Lens, Aspherical TPX Lens, with a diameter of 1 inch and a focal length of 50 mm.
TPX-D25.4-f50 
Lens Diameter:25.4 mm
Focal Length:50.0 mm
Clear Aperture: 22.4 mm
Refractive Index:1.45 at 1 THz
Numerical Aperture(NA):0.21
Center Thickness:7.0 mm
Edge Thickness:4.4 mm
Material:TPX (Polymethylpentene)
Shape:Flat-Convex (Aspheric)
Other types of aspherical TPX lenses
THz Lens, Aspherical TPX Lens,Diameter1 inch, Focal Length67 mm TPX-D25.4-f67
THz Lens, Aspherical TPX Lens,Diameter1 inch, Focal Length100 mm TPX-D25.4-f100
THz Lens, Aspherical TPX Lens,Diameter1 inch, Focal Length150 mm TPX-D25.4-f150
THz Lens, Aspherical TPX Lens,Diameter2 inch, Focal Length35 mm TPX-D50-f35-0
THz Lens, Aspherical TPX Lens,Diameter2 inch, Focal Length65 mm TPX-D50-f65-0
THz Lens, Aspherical TPX Lens,Diameter2 inch, Focal Length100 mm TPX-D50-f100-0
THz Lens, Aspherical TPX Lens,Diameter2 inch, Focal Length200 mm TPX-D50-f200-0
Introduction to TPX Material
Among a large number of polymers, some are transparent to THz waves with very low reflectivity. Generally speaking, the best materials are TPX (polymethylpentene), polyethylene (PE), polypropylene (PP), and polytetrafluoroethylene (PTFE or Teflon). For long wavelengths, the transmittance curves of these polymers are also very flat. For short wavelengths, mainly < 200 µm, the internal inhomogeneity will cause some scattering and fluctuations. That is to say, polymers show an opaque characteristic for short wavelengths.
Polymethylpentene (TPX) is the lightest of all known polymers. It is transparent to ultraviolet, visible and THZ wavelengths. Of course, it can also be collimated using a He-Ne laser. The refractive index of this polymer is approximately 1.46, and it has little relation to the wavelength.
| λ, µm | n |
| 0.633 | 1.463 |
| 24 | 1.4568 |
| 60 | 1.4559 |
| 300 | 1.46 |
| 667 | 1.46 |
| 1000 | 1.4650 |
| 3191 | 1.466 |
TPX has extremely low transmission loss for mm waves. It has excellent thermal resistance and can resist the corrosion of some commercial chemicals.
The transmittance of a 2mm-thick TPX window sheet in the terahertz frequency range
The transmittance of a 2mm-thick TPX window sheet in the infrared wavelength range
The transmittance of a 2mm-thick TPX window sheet in the visible light and near-infrared wavelength ranges