A Zinc Selenide (ZnSe) Double Concave Lens features two symmetrical inner-curved surfaces designed to diverge incident infrared light, increase focal lengths, and expand laser beams with exceptional wavefront clarity. Engineered from premium CVD laser-grade Zinc Selenide and optimized for a 10.6 µm design wavelength, these negative lenses come standard with our high-efficiency IR2 broadband anti-reflection (BBAR) coating, yielding an average reflectance (R_avg) of less than 1.5% across the 8–12 µm long-wave infrared (LWIR) spectrum.

Main Applications of Our ZnSe Double Concave Lens:

  • CO2 Laser Beam Expansion: Functions as a highly durable negative component within Galilean beam expanders to safely diverge and enlarge high-power 10.6 µm laser beams before collimation.
  • Optical System Focal Extension: Serves as a precision diverging lens to counteract positive aberrations, minimize spherical distortion, and extend the effective focal length of multi-element IR imaging assemblies.
  • Infrared Imaging & Sensing: Acts as an efficient dispersing lens to widen the field of view for LWIR thermal imaging cameras, FLIR systems, and horizon-scanning optical sensors.
  • Industrial and Medical Laser Shaping: Optimizes beam profiles and energy distribution for precise material processing, micro-machining, and surgical laser systems.


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