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Achromatic Lenses > Achromatic Doublets

Introduction

Achromatic doublets are cemented by two kinds of lenses low dispersion positive (crown glass) and high dispersion negative (flint glass). The differences of dispersions and shapes of both lenses are designed to minimize the chromatic aberrations at blue (486.1nm) green (546.1nm) and red (656.3 nm). Therefore these lenses perform throughout the visible spectrum. The differences of dispersions and shapes of both elements are effective to decrease spherical aberration. Spherical aberrations of them are much improved than spherical singlets. Spherical aberrations of these lenses are minimized at infinite conjugate ratios.
 
 

Standard Specifications

  

 

Items

Specifications

Material

Crown Glass and Flint Glass

Focal length

±2%

Designed Wavelength

486.1nm, 546.1 nm, 656.3nm

Designed Index

1.5183 ±0.0005

Dimension Tolerance

+0.0/-0.2 mm

Thickness Tolerance

± 0.2 mm

Paraxial Focal Length

± 2%

Clear Aperture

> 85%

Centration

3 arc minutes

Flatness

λ/4 at 632.8 nm

Surface Quality

scratch and dig 60-40

Adhesive

Ultraviolet Hardened Adhesive

Bevel

0.5 (0/-0.3) mm

Notes:

1. Surface Quality could reach 40-20 or 20-10

2. Centration such as 1’, 30” is available.

3. Please show us the size and the coating specification.

  
   

 

Part NO.

ф (mm)

f(mm)

tc(mm)

te(mm)

R1(mm)

R2(mm)

ff(mm)

fb(mm)

LAD0101

10.0

20.0

6.7

5.1

12.1

-26.0

18.8

16.6

LAD0102

10.0

25.0

6.1

4.9

15.6

-31.1

23.8

22.1

LAD0103

10.0

30.1

5.7

4.7

18.5

-39.0

29.0

27.4

LAD0104

12.7

25.1

7.3

5.3

15.6

-32.2

23.7

21.5

LAD0105

12.7

30.0

6.8

5.2

18.5

-39.4

28.8

26.7

LAD0106

12.7

40.1

6.1

4.9

23.4

-60.3

39.2

36.9

LAD0107

15.0

25.2

8.8

6.0

15.4

-33.8

23.7

20.7

  
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Achromatic Doublets
Achromatic Doublets
 

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