Filters

Birefringent Filters

Birefringent filters are used in laser resonators to tune the laser wavelength. In general, they consist of one or more plane-parallel quartz plates whose optical axis is parallel to the plane surface.

Specifications:

Material: Crystal quartz
Parallelism: < 5 arc seconds
Surface quality: 20/10
Diameter tolerance: +0.0, -0.2 mm
Clear aperture: 90% of the central area
T= 0.50 mm ± 0.02 mm
Thicknesses available: T, 1.5T, 2T, 3T, 4T, 5T, 6T, 8T, 10T, 12T

 

f (mm) Part No.
10.0

12.7

15.0

20.0

 BRF1010

BRF1012

BRF1015

BRF1020
Order information: Part No. + nT

 

Individual Neutral Density Filters

 

  1. Metallic Coating Type

    2. Specifications:

    Flatness: 2l per 25 mm
    Surface quality: 80/50
    Parallelism: 3 min.
    Dimension: ± 0.2 mm
    Coating: Vacuum-deposited metallic alloy
    Optical density tolerance: ± 5%

    Optical density Size(mm) BK7 f 25 x 2 BK7 50 x 50 x 2 F. S. f 25 x 2
    Transmission Part No. Part No. Part No.
    0.1 79.1% NMC0101 NMC0201 NMC1101
    0.2 63.1% NMC0102 NMC0202 NMC1102
    0.3 50.1% NMC0103 NMC0203 NMC1103
    0.5 31.6% NMC0105 NMC0205 NMC1105
    0.8 15.8% NMC0108 NMC0208 NMC1108
    1.0 10% NMC0110 NMC0210 NMC1110
    2.0 1% NMC0120 NMC0220 NMC1120
    3.0 0.1% NMC0130 NMC0230 NMC1130
    4.0 0.01% NMC0140 NMC0240 NMC1140
  2. Neutral Density Glass Type

Specifications:

Material: Optical Neutral Density Glass
Flatness: 2l per 25 mm
Surface quality: 80/50
Parallelism: 3 min
Dimension: ± 0.2 mm
Optical Density tolerance: ± 5%

Optical density Transmission Thickness (mm) appr. f 25 mm 50 x 50 mm
Part No. Part No.
0.04

0.1

0.2

0.3

0.4

0.5

0.8

1.0

2.0

3.0

4.0

 92%

79.4%

63.1%

50.1%

39.8%

31.6%

15.8%

10%

1%

0.1%

0.01%

 2.0

1.9

2.0

2.3

3.0

1.8

2.3

2.5

1.5

2.0

2.0

 NDG0004

NDG0010

NDG0020

NDG0030

NDG0040

NDG0050

NDG0080

NDG0100

NDG0200

NDG0300

NDG0400

 NDG0104

NDG0110

NDG0120

NDG0130

NDG0140

NDG0150

NDG0180

NDG0101

NDG0102

NDG0103

NDG0114