Plano-convex lens element #11-409

zinc selenideinfraredfor thermal imaging

Overview
TECHSPEC® Zinc Selenide (ZnSe) Plano-Convex (PCX) Lenses are designed for focusing and collimation in the mid-wave and longwave infrared ranges. Manufactured by Coherent®, these optics use infrared-grade ZnSe with bulk absorption <0.0005 cm^-1 at 10.6 µm. Available uncoated or with broadband anti-reflection coatings (examples: dual-band 3–12 µm and 8–12 µm optimized for CO2 lasers and thermal cameras). Effective focal lengths range from 12.7 mm to 250 mm across a three-diameter family.

Features

• Edmund Optics® designed, Coherent® manufactured
• Premier-grade ZnSe substrate with low bulk absorption
• Offered uncoated or with broadband AR coating options (examples: BBAR 3000–12000 nm, BBAR 8000–12000 nm)

Technical information (coating / transmission highlights)
AR-COATED ZINC SELENIDE
Typical coating design and transmission examples for ZnSe with BBAR coatings at 0° AOI:

• BBAR (3000–12000 nm): Ravg < 5.0% @ 3–12 µm
• BBAR (8000–12000 nm): Ravg ≤ 0.5% @ 8–12 µm

Special handling
These optics require special handling to avoid damage and to preserve long-term performance. Clean and store according to manufacturer recommendations. Zinc Selenide is a toxic material; use appropriate personal protective equipment (rubber or plastic gloves) to avoid contamination and follow local safety procedures.

Notes

• II-VI Incorporated is now Coherent Corp.

Technical specifications

• Substrate: Coherent® Infrared ZnSe
• Bulk Absorption Coefficient: <0.0005 cm^-1 @ 10.6 µm
• Surface Quality: 40-20
• Surface Roughness: <50 Å RMS
• Irregularity (P-V) @ 10.6 µm: < λ/20
• Power (P-V) @ 10.6 µm: λ/10
• Power (P-V) @ 632.8 nm: λ
• Coating options: uncoated or broadband AR (examples: dual-band 3–12 µm, 8–12 µm optimized for CO2)
• Available diameters: family of three diameters
• Effective focal lengths available: 12.7 mm to 250 mm (varies by stock item)
• Handling: protective bevel as needed; PPE and special handling recommended due to material toxicity