TPX Plano-Convex Aspheric Terahertz Lenses

High Transparency from 0.1 to 3 THz
Available in Ø1", Ø50.0 mm, or Ø2"
Back Focal Lengths from 15.0 to 100.0 mm

AL235

Ø50.0 mm TPX Lens for THz,
f = 35.0 mm, NA = 0.54

Application Idea

AL235 Mounted in an LMR2

AL115

Ø1" TPX Lens for THz,
f = 15.0 mm, NA = 0.59

Related Items

800 nm Input THz Antenna

800 nm Femtosecond Laser

1550 nm Femtosecond Fiber Laser

Off-Axis Parabolic Mirrors

HFRZ-Si THz Lens

PTFE THz Lenses

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Overview
Lens Equation
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This graph compares the attenuation coefficients for TPX and PTFE materials as given by the Beer-Lambert law.

Features

Material: TPX (Polymethylpentene)
Ideal for Use from 0.1 to 3 THz
Available Sizes: Ø1", Ø50.0 mm, and Ø2"
Back Focal Lengths Available from 15.0 to 100.0 mm

These TPX (Polymethylpentene) Aspheric Lenses are optimized for focusing or collimating THz radiation from 0.1 to 3 THz. These lenses offer higher transmission in this frequency region compared to our PTFE lenses. Please see the graph at the right for a comparison of the attenuation coefficients of these materials. TPX aspheric lenses are ideal for use with THz emission from our PCA800 THz Antenna and offer easier alignment and improved beam quality compared to off-axis parabolic mirrors.

Please note that it is essential to match the NA of the lens used for collimation with that of the output radiation to avoid truncating the spectrum, because the frequency of the emission from a THz antenna is angularly dependent.

Common Specifications
Material	TPX (Polymethylpentene)
Index of Refraction	1.45 at 1 THz
Shape	Plano-Convex (Aspheric)

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Reference Drawing

Lens Design Formula

Positive Radius Indicates that the Vertex is Located Left of the Center
Negative Radius Indicates that the Vertex is Located Right of the Center

Variable Definitions
z	Sag (Surface Profile) as a Function of Y
Y	Radial Distance from Optical Axis
R	Radius of Curvature
k	Conic Constant

The radius of curvature and conic constant for each lens are listed in the tables below as well as in the individual lens drawings, which can be accessed by clicking the red docs icon () next to each lens sold below.

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Ø1" TPX Plano-Convex Aspheric Lenses

Item #^a	Diameter	Back Focal Length	Numerical Aperture	Center Thickness	Edge Thickness	Clear Aperture	Radius of Curvature (R)^b	Conic Constant (k)^b
	AL115	1"	15.0 mm	0.59	10.0 mm	2.5 mm	22.4 mm	9.9337 mm	-0.57635
	AL125	1"	25.0 mm	0.38	8.0 mm	3.1 mm	22.4 mm	13.878 mm	-0.57699
AL150	1"	50.0 mm	0.21	7.0 mm	4.4 mm	22.4 mm	24.9368 mm	-0.59181

Suggested Lens Mount: LMR1(/M)
Radius of Curvature and Conic Constant define the aspheric surface of the lens. Please see the Lens Equation tab above for details.

Ø50 mm TPX Plano-Convex Aspheric Lenses

Item #^a	Diameter	Back Focal Length	Numerical Aperture	Center Thickness	Edge Thickness	Clear Aperture	Radius of Curvature (R)^b	Conic Constant (k)^b
Item #^a	AL235	50.0 mm	35.0 mm	0.54	18.0 mm	3.0 mm	47.0 mm	21.5277 mm	-0.5805

Suggested Lens Mount: LMR2(/M)
Radius of Curvature and Conic Constant define the aspheric surface of the lens. Please see the Lens Equation tab above for details.

Ø2" TPX Plano-Convex Aspheric Lenses

Item #^a	Diameter	Back Focal Length	Numerical Aperture	Center Thickness	Edge Thickness	Clear Aperture	Radius of Curvature (R)^b	Conic Constant (k)^b
Item #^a	AL265	2"	65.0 mm	0.33	13.0 mm	4.1 mm	47.6 mm	33.657 mm	-0.58018
AL2100	2"	100.0 mm	0.23	10.0 mm	4.0 mm	47.7 mm	48.6619 mm	-0.5766

Suggested Lens Mount: LMR2(/M)
Radius of Curvature and Conic Constant define the aspheric surface of the lens. Please see the Lens Equation tab above for details.