Spherical parts

Spherical parts (lenses):

• Plano-convex lenses
• Plano-concave lenses
• Bi-convex lenses
• Bi-concave lenses
• Convex-concave (meniscus lenses)

Material BK 7, quality optical glass, fused silica Diameter 3÷500 mm Center thickness 1÷60 mm Diameter tolerance +0/-0.1 mm Center thickness tolerance ±0.1 mm Surface accuracy ≤ 3 fringes (1,2λ) – local error, 0.3 fringes (λ/8) – at λ=632.8 nm Surface quality 0.006-mm wide scratches of total length 2x over working aperture Centration ≤ 3 arc min. Chamfers 0÷0.6 mm @ 45o±15o, typical Working aperture ≥ 90% of diameter Antireflection coating Single-layer MgF2 broadband, laser line Working wavelength 210-2100 nm Focus deviation at λ=632.8 nm ±1% Cleaning Non-abrasive method, acetone or isopropyl alcohol on lens tissue are recommended Damage threshold AR coating: 100W/cm2 CW, 2 J/cm2 with 10 n/sec pulses