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DLB
Diameter φD
Focal length f
Edge Thickness te
Center Thickness tc
Back focal length fb
Centration
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Achromatic doublets are cemented achromats made of two different lenses (Low dispersion positive from crown glass and high dispersion negative from flint glass). The difference of dispersion and shape of both lenses are designed to minimize the chromatic aberrations in blue (486.1nm), green (546.1nm) and red (656.3nm). Therefore, these lenses are able to support the entire visible wavelength spectrum.

◦The spherical aberration of achromatic doublets is better than singlets and minimized at infinite conjugate ratios.
◦Achromatic Doublets are coated on both surfaces with a broadband multi-layer anti-reflection coating for the visible wavelength (400 − 700nm).
◦Set the positive part to the side of the incident parallel beam and put the negative part to the side of the focal point to minimize spherical aberration.
◦The difference in focal length of a lens at each wave length is Chromatic aberration and is due to “dispersion of the glass”, the change in refractive index of glass according to wavelength. This can be corrected by combining glasses with low and high dispersions. Spherical aberration is when a ray enters a lens farther from its optical axis and has a shorter focus than a paraxial focus.

Related product
Products
Technical Data
Documents/Downloads
Guide

▶Please contact our Sales Division for customized achromatic doublets. (Customized on size etc.)
▶Please refer to “Lens design data” on “Technical Data” for the lens design data.
▶Air spaced focusing lenses are also available (NYTL/NYDL) designed for laser processing applications.
W3079

Attention

▶Set the positive part to the side of the incident parallel beam and put the negative part to the side of the focal point to minimize spherical aberration.
▶The difference in focal length of a lens at each wave length is Chromatic aberration and is due to “dispersion of the glass”, the change in refractive index of glass according to wavelength. This can be corrected by combining glasses with low and high dispersions.
▶Spherical aberration is when a ray enters a lens farther from its optical axis and has a shorter focus than a paraxial focus.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.

Common Specifications
MaterialBK7, SF2
Design wavelengthBlue: 486.1nm, Green: 546.1nm, Red: 656.3nm
CoatingBroadband Multilayer Antireflection Coating for the Visible
CementUltraviolet Hardened Adhesive
Laser Damage Threshold0.3J/cm2 
(Laser pulse width 10ns, repetition frequency 20Hz)
Surface Quality (Scratch-Dig)40-20
Clear aperture90% of the diameter
Outline Drawing

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Schematic

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Incident direction of the parallel light

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Reference Data
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    JP Yen Stock Qty
DLB-25.4-40PM
DLB-25.4-50PM
DLB-25.4-60PM
DLB-25.4-70PM
DLB-25.4-80PM
DLB-25.4-100PM
DLB-25.4-120PM
DLB-25.4-150PM
DLB-25.4-170PM
DLB-25.4-200PM
DLB-25.4-220PM
DLB-25.4-250PM
DLB-25.4-300PM
DLB-30-50PM
DLB-30-60PM
DLB-30-70PM
DLB-30-80PM
DLB-30-100PM
DLB-30-120PM
DLB-30-150PM
DLB-30-170PM
DLB-30-200PM
DLB-30-220PM
DLB-30-250PM
DLB-30-300PM
DLB-30-350PM
DLB-30-400PM
DLB-30-450PM
DLB-30-500PM
DLB-40-60PM
DLB-40-70PM
DLB-40-80PM
DLB-40-100PM
DLB-40-120PM
DLB-40-150PM
DLB-40-170PM
DLB-40-200PM
DLB-40-220PM
DLB-40-250PM
DLB-40-300PM
DLB-40-350PM
DLB-40-400PM
DLB-40-450PM
DLB-40-500PM

φ25.4mm

40.9mm

7.6mm

12.5mm

34.2mm

<1′

φ25.4mm

50.1mm

7mm

10.9mm

44.9mm

<1′

φ25.4mm

60.1mm

6.6mm

9.8mm

55.2mm

<1′

φ25.4mm

69.9mm

6.2mm

9mm

65.3mm

<1′

φ25.4mm

80mm

6.1mm

8.5mm

75.9mm

<1′

φ25.4mm

100.2mm

5.8mm

7.7mm

96.5mm

<1′

φ25.4mm

119.8mm

5.6mm

7.2mm

116.2mm

<1′

φ25.4mm

149.6mm

5.4mm

6.7mm

146.2mm

<1′

φ25.4mm

170.4mm

5.3mm

6.4mm

167.1mm

<1′

φ25.4mm

200.1mm

5.1mm

6.1mm

197mm

<1′

φ25.4mm

222mm

5.1mm

6mm

218.9mm

<1′

φ25.4mm

250.8mm

5mm

5.8mm

247.7mm

<1′

φ25.4mm

300mm

5mm

5.6mm

296.6mm

<3′

φ30mm

50.3mm

8.6mm

14.1mm

43.5mm

<1′

φ30mm

60.3mm

8.1mm

12.6mm

53.9mm

<1′

φ30mm

70.8mm

7.7mm

11.5mm

65mm

<1′

φ30mm

80.3mm

7.4mm

10.7mm

75mm

<1′

φ30mm

100.7mm

6.8mm

9.5mm

96mm

<1′

φ30mm

120.1mm

6.6mm

8.8mm

115.7mm

<1′

φ30mm

150mm

6.3mm

8.1mm

146mm

<1′

φ30mm

169.9mm

6.1mm

7.7mm

166mm

<1′

φ30mm

200.2mm

6mm

7.3mm

196.4mm

<1′

φ30mm

220.2mm

5.9mm

7.1mm

216.5mm

<1′

φ30mm

249.7mm

5.8mm

6.9mm

246.1mm

<1′

φ30mm

300.4mm

5.7mm

6.6mm

296.9mm

<1′

φ30mm

350mm

5.6mm

6.4mm

346.2mm

<3′

φ30mm

400mm

5.5mm

6.2mm

396.3mm

<3′

φ30mm

450mm

5.5mm

6.1mm

446.5mm

<3′

φ30mm

500mm

5.5mm

6mm

496.5mm

<3′

φ40mm

60.2mm

11mm

19.3mm

50.2mm

<1′

φ40mm

70.3mm

10.2mm

17.2mm

61.7mm

<1′

φ40mm

80.2mm

9.7mm

15.8mm

71.8mm

<1′

φ40mm

99.9mm

8.9mm

13.7mm

92.8mm

<1′

φ40mm

120mm

8.3mm

12.3mm

113.7mm

<1′

φ40mm

150.1mm

7.7mm

10.9mm

144.5mm

<1′

φ40mm

169.7mm

7.5mm

10.3mm

164.5mm

<1′

φ40mm

199.7mm

7.2mm

9.6mm

194.8mm

<1′

φ40mm

220.7mm

7mm

9.2mm

216mm

<1′

φ40mm

249.1mm

6.9mm

8.8mm

244.6mm

<1′

φ40mm

300.5mm

6.7mm

8.3mm

296.1mm

<1′

φ40mm

349.9mm

6.5mm

7.9mm

345.8mm

<1′

φ40mm

399.7mm

6.4mm

7.6mm

395.7mm

<1′

φ40mm

450mm

6.3mm

7.4mm

445.5mm

<3′

φ40mm

500mm

6.3mm

7.2mm

495.6mm

<3′

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