Products > Lenses > Achromatic Lenses Achromatic Lenses Achromatic lenses are lenses consisting of two or more elements, which are usually made of crown and flint glass with differing indices of refraction. One element is positive, the other is negative. Distinct wavelengths can be corrected for chromatic aberration. Achromatic lenses are nearly free from aspherical aberration and coma. Comparing with singlet lenses, achromatic lenses have far superior optical performance. Bond with glue NOA61 (produced by Norland)

The glue can withstand temperatures from -150℃ to 125℃.

Refractive Index of Cured Polymer is 1.56, and transparence from 0.34μm to 2.0μm.

Please go to Norland website for more information of the glue. Specifications Material: See tables Diameter tolerance: +/-0.1mm Design wavelength: 546.1nm Focal tolerance: +/-2% Surface quality : 60-40 S/D Centration: 3 arcmin Surtace flatness: λ/4 @633nm Clear aperture: 90% Bevel: Protective bevel Item# Φ(mm) F(mm) Material-A Material-B R1(mm) R2/R3(mm) R4(mm) Tc(mm) Fb(mm) LAO-6-10 6.0 10.0 SK9 SF15 6.55 -4.05 -23.23 3.6+0.8 7.54 LAO-6-15 6.0 15.0 BK7 SF5 8.83 -6.54 -19.77 2.71+1.0 13.06 LAO-6-20 6.0 20.0 BK7 SF5 12.36 -8.51 -24.38 2.6+1.0 18.29 LAO-6-25 6.0 25.0 BK7 SF5 15.70 -10.66 -29.99 2.3+1.0 23.45 LAO-6-30 6.0 30.0 BK7 SF5 18.88 -12.94 -34.68 1.9+1.0 28.69 LAO-8-25 8.0 25.0 BK7 SF5 15.60 -10.81 -30.48 2.9+1.0 23.12 LAO-8-30 8.0 30.0 BK7 SF5 18.88 -12.88 -36.22 2.7+1.0 28.27 LAO-12-25 12.7 25.0 BK7 SF5 15.60 -11.40 -31.05 4.3+1.3 22.25 LAO-12-30 12.7 30.0 BK7 SF5 18.53 -13.49 -37.84 4.0+1.3 27.36 LAO-12-40 12.7 40.0 BK7 SF5 25.23 -17.54 -48.75 3.4+1.3 37.77 LAO-12-50 12.7 50.0 BK7 SF5 31.26 -21.93 -62.37 3.1+1.3 47.99 LAO-12-75 12.7 75.0 BK7 SF5 46.77 -32.96 -94.62 2.6+1.3 73.23 LAO-18-40 18.0 40.0 BK7 SF5 24.27 -18.35 -53.09 5.4+1.5 36.51 LAO-18-50 18.0 50.0 BK7 SF5 31.69 -22.00 -60.57 4.8+1.5 46.98 LAO-18-60 18.0 60.0 BK7 SF5 37.84 -26.49 -73.79 4.1+1.5 57.30 LAO-18-80 18.0 80.0 BK7 SF5 49.55 -36.81 -165.58 3.4+1.5 77.41 LAO-25-50 25.4 50.0 BaF53 SF4 34.59 -24.21 -179.06 7.8+2.0 44.52 LAO-25-60 25.4 60 BK7 SK5 37.33 -27.16 -75.86 7.0+2.0 55.56 LAO-25-80 25.4 80 K7 SF1 49.09 -37.93 -95.94 5.5+2.0 76.46 LAO-25-100 25.4 100.0 BK3 SF5 60.67 -44.67 -122.18 4.5+2.0 97.05 LAO-25-120 25.4 120.0 BK7 SF5 73.28 -54.33 -159.96 4.2+2.0 117.10 LAO-30-100 30.0 100.0 BK3 SF5 59.02 -45.29 -127.64 6.8+2.5 95.26 LAO-30-140 30.0 140.0 BK3 SF5 84.92 -62.23 170.61 .9+2.54 136.60 Choose Anti-reflective Coatings ● Single layer MgF 2

● Multiple layers AR coating

R<0.25% @ Laser line (view the curve)

R<0.5% @ Broadband Wavelength (view the curve) How to order Singlet Lenses? Example: Element-A: N-SF5 Material: N-BK7 N-SF5 Diameter: Φ25.4 +0/-0.1 Φ25.4+0/-0.1 Thickness Tc1=4.0 Tc2=1.0+/-0.1 Radius: R1=73.28 R2(R3)=-54.33 R4=-159.96 Surface quality:: 60-40s/d Flatness:: λ/4 @633nm Centration:: 3' Coating: AR @430--680nm, R<0.5%, AOI=0° Price on Request Custom Design Volume Discount