ZnSe Plano-Concave Lenses
ZnSe plano-concave lenses for IR beam expansion, divergence control, and Galilean beam expanders. Send drawings for custom diameter and coating review.
Product Overview
Overview
ZnSe plano-concave lenses are negative focal length optics used to diverge infrared beams and expand beam paths. They are commonly combined with positive lenses in beam expanders or for adjusting beam divergence before detectors.
Engineering Value
The plano-concave geometry produces a virtual focus and diverges collimated IR light. This is useful for beam expansion, divergence control, and pre-collimation adjustment in CO₂ laser and thermal imaging systems. ZnSe transmission supports the mid-IR range, making these lenses compatible with CO₂ laser wavelengths.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High purity CVD ZnSe |
| Wavelength Range | 610 nm – 16000 nm |
| Diameter | Ø1–Ø500 mm |
| Thickness | 2–30 mm (customizable) |
| Focal Length | -20 to -1000 mm (negative) |
| Clear Aperture | >90% |
| Diameter Tolerance | +0.00/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Surface Quality | 60/40 / 40/20 / 20-10 |
| Surface Irregularity | λ/4 @ 633 nm |
| Centering Error | 3 arcmin |
| Chamfer | 0.2 mm × 45° |
| Coating Options | IR or CO₂ laser AR coating targets |
Selection Notes
When selecting a plano-concave lens, engineers should confirm focal length sign, coating wavelength, beam diameter, and mechanical envelope. OPTOstokes-IROptical can review drawings or system requirements before quotation.
Request Engineering Review
Send your diameter, focal length, coating target, and quantity to request a quote or contact sales@iroptical.com for technical support.
Technical Parameters
Detailed specifications are not available for this product yet. Please contact the team for application guidance.