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ADD:No.242 Beihai Street, Dadong District, Shenyang City, Liaoning Province

TLL:024-88722463(Filter)

  024-88710226(Reflector) 

  024-88710538(International)          

FAX:024-88722312(Filter)

      024-88710655(Reflector)

EMAIL:info@hb-optical.com

Fixed neutral density filter

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Fixed neutral density filter

Neutral density filters (density filters for short) are filters that attenuate light intensity without changing the energy distribution of the spectrum. The fixed neutral density filter can attenuate the light intensity evenly in a wide spectrum area, and the surface is coated with a durable metal film layer. This type of filter can be used in natural light and laser fields. The fixed density filter is divided into absorption plus reflection type density film and low inversion type density film (ND mirror), which neutrally attenuates light in a large spectral range, and it is also particularly suitable for the calibration of optical systems. Density sheets with special sizes, densities, and wavelengths can be customized.
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Neutral density filters (density filters for short) are filters that attenuate light intensity without changing the energy distribution of the spectrum. The fixed neutral density filter can attenuate the light intensity evenly in a wide spectrum area, and the surface is coated with a durable metal film layer. This type of filter can be used in natural light and laser fields. The fixed density filter is divided into absorption plus reflection type density film and low inversion type density film (ND mirror), which neutrally attenuates light in a large spectral range, and it is also particularly suitable for the calibration of optical systems. Density sheets with special sizes, densities, and wavelengths can be customized.
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Substrate

BK7, fused silica

Thickness tolerance

±0.1mm

Clear aperture

90% of the total area

Parallelism

3’

Surface Quality

80-50

Standard deviation of optical density

±5%

Calibration wavelength

550nm

Design wavelength

380nm-2000nm (BK7)

250nm-2500nm (fused silica)

 

Standard product:

 

Part Number

Dimensions (mm)

Optical density

Transmittance

Substrate

FXND10-B12

Φ12.7

1.0

10.0 %

BK7

FXND20-B12

Φ12.7

2.0

1.0%

BK7

FXND30-B12

Φ12.7

3.0

0.1%

BK7

FXND40-B12

Φ12.7

4.0

0.01%

BK7

FXND10-B60

Φ60

1.0

10.0 %

BK7

FXND20-B60

Φ60

2.0

1.0%

BK7

FXND30-B60

Φ60

3.0

0.1%

BK7

FXND40-B60

Φ60

4.0

0.01%

BK7

FXND10-B50S

50 * 50

1.0

10.0 %

BK7

FXND10-B50S

50 * 50

2.0

1.0%

BK7


Standard density film group:

 

Part Number

Dimensions

Series

Substrate

FXNDF-B12A

Φ12.7

A

BK7

FXNDF-B12B

Φ12.7

B

BK7

FXNDF-B25A

Φ25.4

A

BK7

FXNDF-B25B

Φ25.4

B

BK7

FXNDF-B60A

Φ60

A

BK7

FXNDF-B60B

Φ60

B

BK7

FXNDF-B50A S

50 * 50

A

BK7

FXNDF-B50B S

50 * 50

B

BK7

 

Series type:

 

Optical density

A

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

 

                       Transmittance

B

15%

20%

25%

30%

40%

50%

60%

70%

80%

 

Other parameters such as size, optical density and wavelength can be customized according to customer needs. You are welcome to contact us.

 

 

It is mainly used in the field that needs to evenly attenuate the light intensity in a wide spectrum region. This product is suitable for common light source and laser light source.