Optical Materials

20 Sep.,2022

 

IR Lens

Materials

Optical Materials for Lens and Lens Array Design

We offer optical-quality acrylic, polycarbonate, cyclic olefin copolymers (COC), and other specialized materials for the visible light spectrum. These materials transmit somewhat in the near infrared and ultraviolet as well. POLY IR® is our registered trademark for our line of infrared-transmitting polymers.  Fresnel Technologies, Inc. produces infrared transmitting Fresnel lenses in seven materials, each with unique transmittance capabilities for a wide variety of applications. This graph can be useful in determining which materials are appropriate in the wavelength range of interest for your application.

Materials for visible and Near infrared (nir)

Acrylic

 

  • Most widely applicable
  • General-purpose material in the visible light region
  • Transmittance is nearly flat and is almost 92% from the UV to the near-infrared
  • Available in standard, impact modified, UV transmitting and UV filtering grades

Cyclic Olefin Copolymers (COC) 

  • Offer acrylic-like transparency in the visible and UVA ranges with a higher index of refraction
  • Superior chemical resistance and lower water absorption than acrylic
  • Grades available with low birefringence, biocompatibility and/or resistance to high power NIR or blue light
  • Can be coated

Polycarbonate

  • Spectrally similar to acrylic
  • Useful at higher temperatures and very impact resistant
  • Standard thicknesses available in polycarbonate are 0.015" (0.38 mm), 0.030" (0.76 mm), 0.050" (1.3 mm), 0.060" (1.5 mm), and 0.125" (3.2 mm). 0.015" and 0.030" are the preferred thicknesses for polycarbonate, unless an item cannot be molded in one of those thicknesses