Broadband AR Coated Achromatic Lenses(Doublet Lenses)

1. What do you mean by achromatic combination?

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An achromatic lens can be defined as a lens which is made by acombination of two different types of lenses carrying different focal powers in a manner such that the images formed by the light of both the combined lenses are free from chromatic aberration or achromatism.

2. What are achromatic lenses used for?

Achromatic Lenses are used to minimize or eliminate chromatic aberration. The achromatic design also helps minimize spherical aberrations. Achromatic Lenses are ideal for a range of applications, including fluorescence microscopy, image relay, inspection, or spectroscopy.

3. What can we do for you ?

Achromatic Lenses

Cemented Achromatic Doublets
Cemented Achromatic Triplets
Achromatic Doublet Pairs
Negative Achromatic Lenses
Achromatic Cylindrical Lenses
Near UV Achromatic Lenses
Near-IR (NIR) Achromatic Lenses 
UV-to-NIR Corrected Triplets

Specification

Material:

 Crown Glass&Flint Glass CDGM, Schott, Ohara etc

Dimension Tolerance:

 ±0.1mm(Standard), ±0.01mm(High Precision)

Center Thickness Tolerance:

 ±0.1mm(Standard), ±0.05mm(High Precision)

Paraxial Focal Length:

 ±2%

Surface quality:

 60/40(Standard), 20/10(High Precision)

Clear Aperture:

 >85%

Surface Figure:

 λ/2(Standard), λ/4(High Precision) @633nm

Centration:

 3 arc minutes

Bevel:

 <0.25mm×45°

Coating:

Upon requirement

Part No.

F(mm)

Φ

(mm)

Nd A

Nd B

R1

(mm)

R2=R3

(mm)

R4

(mm)

Tc1

(mm)

Tc2

(mm)

Fb

(mm)

ULAC

20

6

BK7

SF5

12.36

-8.51

-24.38

2.6

1.0

18.29

ULAC

25

6

BK7

SF5

15.7

-10.66

-29.99

2.3

1.0

23.45

ULAC

30

6

BK7

SF5

18.88

-12.94

-34.68

1.9

1.0

28.69

ULAC

25

8

BK7

SF5

15.6

-10.81

-30.48

2.9

1.0

23.12

ULAC

30

8

BK7

SF5

18.88

-12.88

-36.22

2.7

1.0

28.27

ULAC

25

12.7

BK7

SF5

15.6

-11.40

-31.05

4.3

1.3

22.25

ULAC

30

12.7

BK7

SF5

18.53

-13.49

-37.84

4.0

1.3

27.36

If you are looking for more details, kindly visit Achromatic Cemented Double Lenses manufacturer.

ULAC

40

12.7

BK7

SF5

25.23

-17.54

-48.75

3.4

1.3

37.77

ULAC

50

12.7

BK7

SF5

31.26

-21.93

-62.37

3.1

1.3

47.99

ULAC

75

12.7

BK7

SF5

46.77

-32.96

-94.62

2.6

1.3

73.23

ULAC

40

18

BK7

SF5

24.27

-18.35

-53.09

5.4

1.5

36.51

ULAC

50

18

BK7

SF5

31.69

-22.00

-60.57

4.8

1.5

46.98

ULAC

60

18

BK7

SF5

37.84

-26.49

-73.79

4.1

1.5

57.3

ULAC

80

18

BK7

SF5

49.55

-36.81

-165.58

3.4

1.5

77.41

ULAC

60

25.4

BK7

SK5

37.33

-27.16

-75.86

7.0

2.0

55.56

ULAC

120

25.4

BK7

SF5

73.28

-54.33

-159.96

4.2

2.0

117.1

ULACN

-25

12.7

BK7

F2

-15.6

13.09

44.16

3.0

2.7

27.5

ULACN

-50

25.4

BK7

F2

-31.19

24.89

85.31

3.0

4.2

53.3

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I would suggest that you reconsider your specification of a $40\, \rm mm$ focal length and a 40 mm diameter which even for a simple lens is not so easy.

If it was a simple thin lens with both surfaces having a radius of curvature $R$ then you could use the lens maker's formula $\frac 1 f = (n-1)\left (\frac 1R + \frac 1R \right )$, where $n$ id the refractive index of the glass and $f$ the focal length of the lens to evaluate the necessary radius of surfaces to produce a lens with focal length $40\, \rm mm$.
If $n=1.5$ the this gives $R= 40\, \rm mm$ giving a maximum aperture, which the lens a sphere, of $80\, \rm mm$.

Given that the simplest achromatic doublet is a converging lens followed by a diverging lens you are not going to get the aperture that you desire with a focal length of $40\,\rm mm$.

I have simplified matters in that you can get lens made of materials with higher refractive indices but the point I am making is that you need to change the aperture and/or the focal length to more realistic values.

Telescope makers design achromatic lenses and here is an example of what is involved although the examples that are given are for lenses with a focal length greater than your specification. Good microscope objectives have a number of lens as can be seen in this diagram

which is taken from this website which gives a good overview of what is required.

I would imagine that as a start (and end) for a school project you should start with a simple combination of two commercially available lens, one a biconvex lens and the other as a plano-concave lens a shown below?

which is taken from the Wikipedia article achromatic lens.

If you want the component lens to look like a single lens then you must make sure that the radii of curvature of adjacent sides are as close to one another as possible and given that there will be imperfections you should consider using a suitable oil between the lenses to reduce the effect of such imperfections.

The company is the world’s best Achromatic Cemented Double Lenses factory supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.