Thorlabs - Teflon<sup>®</sup> Plano-Convex Lenses

Common Specifications
Material	PTFE Teflon^® Dielectric Constant: 1.96 at 520 GHz
Design Frequency	500 GHz, n=1.4
Surface Irregularity	10 μm, corresponding to λ/20 at 1.5 THz
Diameter Tolerance	+0.00/-0.20 mm
Surface Quality	60-40 Scratch-Dig
Spherical Surface Power*	0.0025λ
Centration	≤3 arcmin
Clear Aperture	>85% of diameter

*Much like surface flatness for flat optics, surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.

Teflon^®Plano-Convex Lenses

As part of our continuing effort to make new technologies available to our customers, Thorlabs offers components for use in the THz range. Our intention is to continually broaden the THz product offerings in the future.

We provide plastic plano-convex lenses made with Polytetrafluoroethylene (Virgin White PTFE, Teflon^®), which has a low dielectric constant of approximately 1.96 @ 520 GHz and an index of refraction of 1.4. The low dielectric constant of PTFE ensures that the insertion loss is reasonably low. PTFE is usable for frequencies up to ~2 THz.

The Terahertz (THz) range can be expressed as the frequency range of 300 GHz to 10 THz or the wavelength range of 30 μm to 1 mm. Until recently, the THz range was a relatively unused part of the electromagnetic spectrum; however, in recent years the THz band has been gaining popularity in applications such as spectroscopy, astronomy, remote sensing, and in security (THz imaging). The THz band is situated between microwaves and optics on the electromagnetic spectrum. This location influences the mixture of microwave and optical technologies used in the THz band.

Telfon Absorption Graph

Quick Links to Other Spherical Singlets
Plano-Convex	Bi-Convex	Best Form	Plano-Concave	Bi-Concave	Positive Meniscus	Negative Meniscus

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Posted Comments:

Poster: jlow

Posted Date: 2012-09-28 09:39:00.0

Response from Jeremy at Thorlabs: We do not have data on the permittivity in that frequency range. I was able to find a reference paper online which states a relative permittivity of 2.07 at 100GHz for Teflon (PTFE).

Poster: y.u.sevincli

Posted Date: 2012-09-20 11:02:28.0

I'm looking for permittivity data for the Teflon that you used for LAT100 lens between 30-120 GHz. Can anybody please send that data or suggest a source about that?

Poster: jjurado

Posted Date: 2011-05-10 15:22:00.0

Response from Javier at Thorlabs to matthias.hoffmann: Thank you very much for your feedback. We may be able to provide Teflon lenses that comply with your requirements. I will contact you directly to get more details.

Poster: matthias.c.hoffmann

Posted Date: 2011-05-10 11:28:41.0

It would be useful to offer some immediate focal length (like 150 and 200 mm) and maybe also slightly larger diameters like 65 mm or 3 inch. If you are able to offer 2 inch dia/200 mm focal length lenses as custom product, please feel free to contact me.

Poster: Laurie

Posted Date: 2009-01-07 15:35:54.0

Response from Laurie at Thorlabs to daniel: Thank you for your interest in our teflon optics. We have made custom Teflon lenses in the past. A member of our technical support staff will contact you to obtain more information about your specific needs (dimensions, tolerances, quantity, etc.)

Poster: daniel

Posted Date: 2009-01-07 13:21:22.0

I have a question about your teflon lenses. We have a need for teflon optics larger than 50 mm diameter. Can you make custom sizes, for example a six-inch diameter? What would be the cost and delivery time for a custom order of this type? As a first guess, Id specify the tolerances to be the same as those you specify for your stock products.

Poster: Laurie

Posted Date: 2008-10-01 12:10:52.0

Response from Laurie at Thorlabs to Zachary: Thank you for your interest in our products. We may be able to provide 100 mm diameter lenses of varying focal lengths. Someone from our technical support staff will contact you shortly, as we would need a drawing showing the dimensions and tolerances you require as well as the quantity needed prior to providing a formal quotation.

Poster: Zachary.Taylor

Posted Date: 2008-10-01 03:12:48.0

Do you guys fill custom orders say for a 100 mm diamter lens with different focal lengths?

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Teflon^® Plano-Convex Lenses

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Teflon^® Plano-Convex Lenses