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Spherical parts (lenses): Plano-convex lenses; Plano-concave lenses; Bi-convex lenses; Bi-concave lenses; Convex-concave (meniscus lenses)
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Material |
BK 7, quality optical glass, fused silica |
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Diameter |
3÷500 mm |
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Center thickness |
1÷60 mm |
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Diameter tolerance |
+0/-
0.1 mm
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Center thickness tolerance |
±
0.1 mm
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Surface accuracy |
≤ 3 fringes (1.2λ) – local error, 0.3 fringes (λ/8) – at λ=632.8 nm |
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Surface quality |
0.006-mm wide scratches of total length 2x over working aperture |
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Centration |
≤ 3 arc min. |
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Chamfers |
0÷0.6 mm @ 45o±15o, typical |
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Working aperture |
≥ 90% of diameter |
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Antireflection coating |
Single-layer MgF2 broadband, laser line |
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Working wavelength |
210-2100 nm |
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Focus deviation at λ=632.8 nm |
±1% |
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Cleaning |
Non-abrasive method, acetone or isopropyl alcohol on lens tissue are recommended |
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Damage threshold |
AR coating: 100W/cm2 CW, 2 J/cm2 with 10 n/sec pulses |
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PLANAR (KBTEM)