Beam Expanders
(Reference: Basics of Beam Expander)
 

The most common type of beam expander is derived from the Galilean telescope which usually has one negative input lens and one positive output lens. The input lens presents a virtual beam focus at the output. For low expansion ratios (1.3-20 times) the Galilean telescope is most often employed due to its simplicity, small package size and low cost.

* Material: BK7 fine annealed
* Diameter: -0.1mm
* Thickness: ±0.1mm
* Flatness: l/4
* Surface Quality: 60-40 scratch-dig
* Coating: HR dielectric coatings R > 99%

 

Part number description: BEST-xxx-yy-z-M-T-AA

BEST ---  BEST series beam expanders

xxxx------- laser wavelength: 10.6 means 10.6um, 532 means 532nm, 633 means 633nm.

yy  -------- expansion ratio in times

Z   -------- lens material: Z means ZnSe; G means GaAs, none means optical glass.

L ---------- beam expander shaper, L means trumpet-shape, none means cylinder shape.

M --------- connection: M means screw connection; none means cylinder connection.

T ---------- type: T means adjustable beam expander; none means fixed beam expander.

AA -------- special purpose.

Example: BEST-10.6-3GM: 10.6um fixed beam expander, 3x, GaAs material, cylinder, screw connection.

                BEST-10.6-3.5Z: 10.6um fixed beam expander, 3.5x, ZnSe material, cylinder.
 

1. BEST Series CO2 Laser Beam Expanders (10.6um)

 

There are 2 types of beam expander: fixed and adjustable beam expanders. For the fixed beam expanders, the spacing between the two lenses inside the beam expander is fixed, but the spacing between the two lenses inside the adjustable beam expanders is adjustable. The lens material is ZeSe, which allows the red light to go through the beam expander.

 

(1) Fixed Beam Expanders: there are 2 types of outlines: cylinder shape and trumpet shape. For each outline there are 2 types of connections: cylinder connection and screw connection.

 

Cylinder-shape fixed beam expander

  

Model

Expansion ratio (times)

L

(mm)

D

(mm)

l

(mm)

Input clear aperture (mm)

Output clear aperture ( mm )

Connection

(mm)

BEST-10.6-2Z

2

30

24

 

7

14

f24

BEST-10.6-2ZM

2

30

24

6

7

14

M22x0.75

BEST-10.6-2.5Z

2.5

40

24

 

5.6

14

f24

BEST-10.6-2.5ZM

2.5

40

24

6

5.6

14

M22x0.75

BEST-10.6-3Z

3

50

24

 

5.3

16

f24

BEST-10.6-3ZM

3

50

24

6

5.3

16

M22x0.75

BEST-10.6-4Z

4

69.7

31

 

5.75

23

f31

BEST-10.6-4ZM

4

69.7

31

6

5.75

23

M22x0.75

BEST-10.6-5Z

5

89.8

31

 

4.6

23

f33

BEST-10.6-5ZM

5

89.8

31

6

4.6

23

M22x0.75

 

Trumpet-shape fixed beam expander

Model

Expansion ratio (times)

L

(mm)

D

(mm)

l

(mm)

Input clear aperture (mm)

Output clear aperture ( mm )

Connection

(mm)

BEST-10.6-2ZL

2

30

24

11.5

7

14

D24/d18

BEST-10.6-2ZLM

2

30

24

6

7

14

M22x0.75

BEST-10.6-2.5ZL

2.5

40

24

15.5

5.6

14

D24/d18

BEST-10.6-2.5ZLM

2.5

40

24

6

5.6

14

M22x0.75

BEST-10.6-3ZL

3

50

24

19

5.3

16

D24/d18

BEST-10.6-3ZLM

3

50

24

6

5.3

16

M22x0.75

BEST-10.6-4ZL

4

69.7

31

26.5

5.75

23

D31/d25

BEST-10.6-4ZLM

4

69.7

31

6

5.75

23

M22x0.75

BEST-10.6-5ZL

5

89.8

31

34

4.6

23

D33/d25

BEST-10.6-5ZLM

5

89.8

31

6

4.6

23

M22x0.75
 

ZnSe-based Fixed Beam Expander: - W Series

  Part No.

Magnification

Input CA (mm)

Output CA (mm)

O.D Dia1 (mm)

O.D Dia2 (mm)

L1 (mm)

L2 (mm)

BEST-9.4-2X-W

2

16.5

23

M22X0.75

28

59

54

BEST-9.4-3X-W

3

10

20

28

28

61

51.5

BEST-9.4-5X-W

5

13

23

20

30

72

42

BEST-10.6-1.5-W

1.5

13

16

20

-

35

-

BEST-10.6-2-W

2

10

15

22

-

32.5

-

BEST-10.6-2A-W

2

15

17

22

-

35

-

BEST-10.6-2L-W

2

27

53

M44X1

63

72

47

BEST-10.6-2.5-W

2.5

12

20

27

-

54

-

BEST-10.6-3A-W

3

10

15

20

20

61

-

BEST-10.6-3B-W

3

12.5

20

20

28

59

29

BEST-10.6-3C-W

3

13

20

20

28

110

60

BEST-10.6-3X-W

3

11

16

20

20

59

-

BEST-10.6-3.3-W

3.3

10

15

21

21

67

-

BEST-10.6-4-W

4

10

20

20

28

67

46

BEST-10.6-4A-W

4

10

25

20

31

67

48

BEST-10.6-4C-W

4

12

23

20

30

135

90

BEST-10.6-5-W

5

12

23

20

30

72

47

BEST-10.6-5A-W

5

12

28

20

36

70

45

BEST-10.6-6A-W

6

10

28

20

36

75

55

BEST-10.6-8-W

8

13

26

20

36

120

75.1

BEST-10.6-8A-W

8

10

30

20

36

73

55.5
 

 (2) Adjustable Beam Expanders

 

These beam expanders are designed specially for large divergent laser beam.  Changing the distance between two lenses inside the beam expander can decrease the beam divergence to obtain better collimation of the laser beam. If they are used for large-divergence laser beam, you may turn the inner body to increase the spacing of two lenses and then to obtain better collimation laser beam. The material is ZnSe and thus the red light can go through the beam expander.

 

Cylinder-shape adjustable beam expanders

Model

Expansion ratio

(times)

L

(mm)

D

(mm)

l

(mm)

Input clear aperture (mm)

Output clear aperture ( mm )

Connection

(mm)

BEST-10.6-2ZT

2

40

24

8

7

14

f24

   BEST-10.6-2ZTM

2

46

24

6

7

14

M22x0.75

BEST-10.6-2.5ZT

2.5

50

24

8

5.6

14

f24

  BEST-10.6-2.5ZTM

2.5

56

24

6

5.6

14

M22x0.75

BEST-10.6-3ZT

3

60

24

8

5.3

16

f24

  BEST-10.6-3ZTM

3

66

24

6

5.3

16

M22x0.75

BEST-10.6-4ZT

4

75.7

31

8

5.75

23

f31

BEST-10.6-4ZTM

4

79.7

31

6

5.75

23

M22x0.75

BEST-10.6-5ZT

5

95.8

31

8

4.6

23

f33

BEST-10.6-5ZTM

5

99.8

31

6

4.6

23

M22x0.75

 

Trumpet-shape adjustable beam expanders

Model

Expansion ratio

(times)

L

(mm)

D

(mm)

l

(mm)

Input clear aperture (mm)

Output clear aperture ( mm )

Connection

(mm)

BEST-10.6-2ZTL

2

40

24

8

7

14

f24

   BEST-10.6-2ZTLM

2

46

24

6

7

14

M22x0.75

BEST-10.6-2.5ZTL

2.5

50

24

8

5.6

14

f24

  BEST-10.6-2.5ZTLM

2.5

56

24

6

5.6

14

M22x0.75

BEST-10.6-3ZTL

3

60

24

8

5.3

16

f24

  BEST-10.6-3ZTLM

3

66

24

6

5.3

16

M22x0.75

BEST-10.6-4ZTL

4

75.7

31

8

5.75

23

f31

BEST-10.6-4ZTLM

4

79.7

31

6

5.75

23

M22x0.75

BEST-10.6-5ZTL

5

95.8

31

8

4.6

23

f33

BEST-10.6-5ZTLM

5

99.8

31

6

4.6

23

M22x0.75

 

ZnSe-based Adjustable Beam Expander: - TW Series

 

Part No.

Magnification

Input CA (mm)

Output CA (mm)

M1

Dia1 (mm)

Dia2 (mm)

L1 (mm)

L2 (mm)

BEST-10.6-2Z-TW

2

10

15

M16x0.75

22

22

37

51

BEST-10.6-2Z1-TW

2

10

23

M22x0.75

32

32

38

48

BEST-10.6-2ZG-TW

2

10

15

M16x0.75

22

22

40

51

BEST-10.6-2Z3-TW

2

15

28

M22x0.75

36

36

33

48

BEST-10.6-2Z4-TW

2

10

15

M16x0.75

20

20

37

50

BEST-10.6-2.5Z-TW

2.5

10

16

M16x0.75

20

20

45

55.2

BEST-10.6-2.5Z1-TW

2.5

10

15

M16x0.75

20

20

25

34

BEST-10.6-2.5Z2-TW

2.5

10

20

M22x0.75

28

28

40.5

56

BEST-10.6-3X3T-TW

3

10

16

M16x0.75

-

20

28

37

BEST-10.6-3Z1-TW

3

10

16

M16x0.75

20

20

45

61

BEST-10.6-3Z2-TW

3

10

20

M22x0.75

28

28

47

61

BEST-10.6-3Z3-TW

3

10

16

M16x0.75

20

20

28

37

BEST-10.6-3Z4/1-TW

3

10

25

M22x0.75

32

32

43

60

BEST-10.6-3Z5-TW

3

15

35

M22x0.75

44

44

60

73

BEST-10.6-3Z6-TW

3

15

28

M22x0.75

36

36

51

60

BEST-10.6-3.75Z-TW

3.75

23

26

M33x0.5

36

36

48

64

BEST-10.6-4X-TW

4

11

17

-

M24x0.5

26

51.5

66

BEST-10.6-4Z-TW

4

10

16

M16x0.75

20

20

47

55

BEST-10.6-4Z1-TW

4

10

20

M22x0.75

28

28

55

71

BEST-10.6-4Z2-TW

4

15

28

M22x0.75

36

36

51

66

BEST-10.6-4Z3-TW

4

10

20

-

26

32

50

70

BEST-10.6-5Z-TW

5

10

16

M16x0.75

20

20

43

58

BEST-10.6-5Z1-TW

5

10

23

M22x0.75

30

30

56

71

BEST-10.6-6Z-TW

6

11

26

M22x0.75

32

32

62

76

BEST-10.6-6Z1-TW

6

10

35

M22x0.75

44

44

60

75

BEST-10.6-6Z2-TW

6

10

15

M16x0.75

20

20

45

60

BEST-10.6-8Z1-TW

8

10

33

M22x0.75

44

44

98

118

BEST-10.6-10Z1-TW

10

10

36

M22x0.75

44

44

98

118
 

2. BEST Series Nd:YAG Laser Beam Expanders (1064nm and 532nm)

  

Model

Wave-
length(nm)

Expansion ratio (times)

Input clear aperture (mm)

Output clear aperture (mm)

Out diameter

(mm)

length

 (mm)

connection
(mm)

BEST-1064-2.5

1064

2.5

15

28

36

60

f36

BEST-1064-3

1064

3

15

32

42

77

f32 or f32

BEST-1064-3-2

1064

3

10

28

34

66.5

M22x0.75

BEST-1064-4

1064

4

10

28

34

72.5

M22x0.75

BEST-1064-4-2

1064

4

10

28

34

58

M22x0.75

BEST-1064-4-3

1064

4

11

23

25

64

f25

BEST-1064-5

1064

5

10

28

34

76.5

M22x0.75

BEST-1064-6

1064

6

10

28

34

81.5

M22x0.75

BEST-1064-6-2

1064

6

10

28

39

95

M22x0.75 or f39

BEST-1064-6-3

1064

6

11

23

25

64

f25

BEST-1064-8

1064

8

10

28

34

86.5

M22x0.75

BEST-532-10

532

10

11

28

34

83

M30x1

BEST-532-15

532

15

11

34

40

101

M30x1

BEST-532-20

532

20

11

28

34

83

M30x1

3. BE Series HeNe Laser Beam Expanders (633nm)

P/N

Expansion ratio (times)

Input clear aperture (mm)

Output clear aperture (mm)

Out diameter

(mm)

length

 (mm)

connection
(mm)

BEST-633-03 3 10 28 34 66.5 M22x0.75
BEST-633-05 5 10 28 34 76.5 M22x0.75
BEST-633-10 10 11 28 34 83 M30x1
BEST-633-20 20 8 78 89 173 M30x1
 

Customized beam expanders (different expansion ratios, wavelengths and dimensions) are available on request.
beam expander mount and holder