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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.

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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
Design wavelengthBlue: 486.1nm, Green: 546.1nm, Red: 656.3nm
CoatingBroadband Multilayer Antireflection Coating for the Visible
MaterialBK7, SF2
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-50-80PM
DLB-50-100PM
DLB-50-120PM
DLB-50-150PM
DLB-50-170PM
DLB-50-200PM
DLB-50-220PM
DLB-50-250PM
DLB-50-300PM
DLB-50-350PM
DLB-50-400PM
DLB-50-450PM
DLB-50-500PM
DLB-50-600PM
DLB-50-700PM
DLB-50-800PM
DLB-50-1000PM
DLB-50.8-100PM
DLB-50.8-120PM
DLB-50.8-150PM
DLB-50.8-200PM
DLB-50.8-250PM
DLB-50.8-300PM
DLB-50.8-400PM
DLB-50.8-500PM
DLB-50.8-700PM
DLB-50.8-1000PM
DLB-60-170PM
DLB-60-200PM
DLB-60-250PM
DLB-60-500PM
DLB-60-600PM
DLB-80-150PM
DLB-80-200PM
DLB-80-300PM
DLB-80-500PM
DLB-80-800PM
DLB-100-200PM
DLB-100-300PM
DLB-100-500PM
DLB-100-800PM
DLB-100-1000PM

φ50mm

81mm

13.4mm

22.9mm

69.1mm

<1′

φ50mm

100.5mm

12.3mm

19.9mm

90mm

<1′

φ50mm

120.2mm

11.4mm

17.7mm

111mm

<1′

φ50mm

150.7mm

10.5mm

15.5mm

142.8mm

<1′

φ50mm

169.8mm

10.1mm

14.5mm

162.5mm

<1′

φ50mm

200.1mm

9.6mm

13.3mm

193.3mm

<1′

φ50mm

220.7mm

9.3mm

12.7mm

214.5mm

<1′

φ50mm

249.4mm

9.1mm

12.1mm

243.4mm

<1′

φ50mm

299.5mm

8.7mm

11.2mm

293.7mm

<1′

φ50mm

350.2mm

8.6mm

10.7mm

344.5mm

<1′

φ50mm

400mm

8.3mm

10.2mm

394.7mm

<1′

φ50mm

451.5mm

8.3mm

9.9mm

446.2mm

<1′

φ50mm

500.3mm

8.1mm

9.6mm

495.2mm

<1′

φ50mm

599.9mm

8mm

9.2mm

594.4mm

<3′

φ50mm

700mm

7.8mm

8.9mm

694.6mm

<3′

φ50mm

800mm

7.7mm

8.6mm

794.9mm

<3′

φ50mm

1000mm

7.6mm

8.3mm

995mm

<3′

φ50.8mm

100.5mm

12.1mm

19.9mm

90mm

<1′

φ50.8mm

120.2mm

11.2mm

17.7mm

111mm

<1′

φ50.8mm

150.7mm

10.4mm

15.5mm

142.8mm

<1′

φ50.8mm

200.1mm

9.5mm

13.3mm

193.3mm

<1′

φ50.8mm

249.4mm

9mm

12.1mm

243.4mm

<1′

φ50.8mm

299.5mm

8.6mm

11.2mm

293.7mm

<1′

φ50.8mm

400mm

8.3mm

10.2mm

394.7mm

<1′

φ50.8mm

500.3mm

8.1mm

9.6mm

495.2mm

<1′

φ50.8mm

700mm

7.8mm

8.9mm

694.6mm

<3′

φ50.8mm

1000mm

7.5mm

8.3mm

995.1mm

<3′

φ60mm

170.8mm

11.4mm

17.7mm

161.9mm

<1′

φ60mm

200.3mm

10.7mm

16.1mm

192.1mm

<1′

φ60mm

250mm

10mm

14.3mm

242.8mm

<1′

φ60mm

499.1mm

8.6mm

10.7mm

493.5mm

<1′

φ60mm

597.9mm

8.3mm

10.1mm

592.6mm

<1′

φ80mm

149.7mm

17.2mm

30.3mm

133.6mm

<1′

φ80mm

200.8mm

14.7mm

24.3mm

188.2mm

<1′

φ80mm

299.8mm

12.4mm

18.8mm

290.2mm

<1′

φ80mm

502.6mm

10.7mm

14.5mm

494.9mm

<1′

φ80mm

800.6mm

9.7mm

12.1mm

794.2mm

<1′

φ100mm

200.6mm

21.8mm

37mm

181mm

<1′

φ100mm

297.3mm

18mm

28mm

283.2mm

<1′

φ100mm

499.6mm

15.2mm

21.1mm

488.8mm

<1′

φ100mm

799.5mm

13.7mm

17.4mm

790.4mm

<1′

φ100mm

998.1mm

13.1mm

16.1mm

989.7mm

<1′

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