OptoSigma

DLB
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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
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
Spec
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DLB-10-20PM
DLB-10-25PM
DLB-10-30PM
DLB-10-40PM
DLB-10-50PM
DLB-10-60PM
DLB-10-70PM
DLB-10-80PM
DLB-10-100PM
DLB-12.7-25PM
DLB-12.7-30PM
DLB-12.7-40PM
DLB-12.7-50PM
DLB-12.7-60PM
DLB-12.7-70PM
DLB-12.7-80PM
DLB-12.7-100PM
DLB-15-25PM
DLB-15-30PM
DLB-15-40PM
DLB-15-50PM
DLB-15-60PM
DLB-15-70PM
DLB-15-80PM
DLB-15-100PM
DLB-20-30PM
DLB-20-40PM
DLB-20-50PM
DLB-20-60PM
DLB-20-70PM
DLB-20-80PM
DLB-20-100PM
DLB-20-120PM
DLB-20-150PM
DLB-20-170PM
DLB-20-200PM
DLB-20-220PM
DLB-20-250PM
DLB-20-300PM
DLB-25-40PM
DLB-25-50PM
DLB-25-60PM
DLB-25-70PM
DLB-25-80PM
DLB-25-100PM
DLB-25-120PM
DLB-25-150PM
DLB-25-170PM
DLB-25-200PM
DLB-25-220PM
DLB-25-250PM
DLB-25-300PM

φ10mm

20mm

5.1mm

6.7mm

16.6mm

<1′

φ10mm

25mm

4.9mm

6.1mm

22.1mm

<1′

φ10mm

30.1mm

4.7mm

5.7mm

27.4mm

<1′

φ10mm

40mm

4.6mm

5.3mm

37.5mm

<1′

φ10mm

50mm

4.4mm

5mm

47.5mm

<1′

φ10mm

60.1mm

4.4mm

4.9mm

57.6mm

<1′

φ10mm

69.9mm

4.3mm

4.7mm

67.3mm

<1′

φ10mm

80.1mm

4.2mm

4.6mm

77.8mm

<1′

φ10mm

100.5mm

4.2mm

4.5mm

98.1mm

<1′

φ12.7mm

25.1mm

5.3mm

7.3mm

21.5mm

<1′

φ12.7mm

30mm

5.2mm

6.8mm

26.7mm

<1′

φ12.7mm

40.1mm

4.9mm

6.1mm

36.9mm

<1′

φ12.7mm

50.1mm

4.7mm

5.7mm

47.3mm

<1′

φ12.7mm

60mm

4.6mm

5.4mm

57.3mm

<1′

φ12.7mm

69.9mm

4.5mm

5.2mm

67.5mm

<1′

φ12.7mm

79.9mm

4.5mm

5.1mm

77.4mm

<1′

φ12.7mm

100.1mm

4.3mm

4.8mm

97.9mm

<1′

φ15mm

25.2mm

6mm

8.8mm

20.7mm

<1′

φ15mm

30.1mm

5.7mm

8mm

26mm

<1′

φ15mm

40.1mm

5.2mm

6.9mm

36.5mm

<1′

φ15mm

50.1mm

5mm

6.3mm

47.1mm

<1′

φ15mm

59.9mm

4.8mm

5.9mm

57mm

<1′

φ15mm

70.2mm

4.8mm

5.7mm

67.4mm

<1′

φ15mm

79.9mm

4.7mm

5.5mm

77.1mm

<1′

φ15mm

100mm

4.5mm

5.2mm

97.3mm

<1′

φ20mm

30.6mm

6.8mm

10.9mm

24.9mm

<1′

φ20mm

40.1mm

6.2mm

9.2mm

35.3mm

<1′

φ20mm

50.2mm

5.7mm

8.1mm

46mm

<1′

φ20mm

60.2mm

5.4mm

7.4mm

56.6mm

<1′

φ20mm

70.1mm

5.2mm

6.9mm

66.7mm

<1′

φ20mm

79.9mm

5.1mm

6.6mm

76.6mm

<1′

φ20mm

99.5mm

4.9mm

6.1mm

96.4mm

<1′

φ20mm

120.3mm

4.7mm

5.7mm

117.3mm

<1′

φ20mm

149.8mm

4.6mm

5.4mm

147mm

<1′

φ20mm

170mm

4.6mm

5.3mm

167.2mm

<1′

φ20mm

200.1mm

4.5mm

5.1mm

197.3mm

<1′

φ20mm

220mm

4.5mm

5mm

216.9mm

<3′

φ20mm

250mm

4.4mm

4.9mm

247mm

<3′

φ20mm

300mm

4.3mm

4.7mm

297.1mm

<3′

φ25mm

40.9mm

7.7mm

12.5mm

34.2mm

<1′

φ25mm

50.1mm

7.1mm

10.9mm

44.9mm

<1′

φ25mm

60.1mm

6.7mm

9.8mm

55.2mm

<1′

φ25mm

69.9mm

6.3mm

9mm

65.3mm

<1′

φ25mm

80mm

6.2mm

8.5mm

75.9mm

<1′

φ25mm

100.2mm

5.9mm

7.7mm

96.5mm

<1′

φ25mm

119.8mm

5.6mm

7.2mm

116.2mm

<1′

φ25mm

149.6mm

5.5mm

6.7mm

146.2mm

<1′

φ25mm

170.4mm

5.3mm

6.4mm

167.1mm

<1′

φ25mm

200.1mm

5.2mm

6.1mm

197mm

<1′

φ25mm

222mm

5.2mm

6mm

218.9mm

<1′

φ25mm

250.8mm

5.1mm

5.8mm

247.7mm

<1′

φ25mm

300mm

5mm

5.6mm

296.6mm

<3′

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