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Products / Optics /Filters /Neutral Density Filters /BK7/B270 Reflective ND Filters /

BK7/B270 Reflective ND Filters

Overview Overview Coating Graphs Order Now!

BK7 is an ideal choice for general purpose visual and NIR application due to excellent transmission, hence it is used in Reflective ND Filters. BK7 Reflective ND Filters reflects incoming beam uniformly across its surface. Typically, they have a metallic coating on its surface. The ratio of transmission to reflection is dependent on the optical density of the filter. Since ND filters can block out light over a wide range, they are frequently used in laser and biomedical application.

The level of attenuation is specified by Optical Density (OD) of the filter.

OD is defined as negative of the base 10 logarithm of the transmission coefficient,

The equation can be shown as:

OD= - Log10 (T/100)

Where T is transmission in percentage.

E.g. A Neutral Density Filter with T= 1% has OD of 2.

General Specifications
Material	BK7
Type	Reflective ND Filter
Bandpass Region(nm)	400-1200
Dimension Tolerance(mm)	±0.2
Thickness(mm)	2
Thickness Tolerance(mm)	±0.1
Flatness	2.5λ @633nm
Surface Quality	60/40
Clear Aperture	>90%
Parallelism(arcmin)	<3
Chamfer	0.2-0.3x45°
Damage Threshold	7.5J/cm² (10ns/10 Hz)

B270 has high transparency for visible and near-infrared light, hence making it an ideal choice in Reflective ND Filters. B270 Reflective ND Filters reflects incoming beam uniformly across its surface. Typically, they have a metallic coating on its surface. The ratio of transmission to reflection is dependent on the optical density of the filter. Since ND filters can block out light over a wide range, they are frequently used in laser and biomedical application.

The level of attenuation is specified by Optical Density (OD) of the filter.

OD is defined as negative of the base 10 logarithm of the transmission coefficient

The equation can be shown as:

OD= - Log10 (T/100)

Where T is transmission in percentage.

E.g. A Neutral Density Filter with T= 1% has OD of 2.

General Specifications
Material	B270
Type	Reflective ND Filter
Bandpass Region(nm)	400-700
Diameter(mm)	25.4
Dimension Tolerance(mm)	+0/-0.2
Thickness(mm)	2
Thickness Tolerance(mm)	±0.2
Flatness	˂2λ@633nm
Surface Quality	60-40
Clear Aperture	>90%
Parallelism(arcmin)	<5
Chamfer	<0.5mmx45°
Damage Threshold(pulsed)	7.5J/cm² (10ns/10Hz)

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Optical Density

Diameter (mm)

Search Reset

	Optical Density	Peak Transmittance (%)	Bandpass Region (nm)	Diameter (mm)	Availability	Reference Price (USD)
BK7-RNDF-25.4-0.045 BK7, Reflective ND filter, Diameter=25.4mm, Optical Density:0.045			400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-0.045 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:0.045			400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-0.1 BK7, Reflective ND filter, Diameter=25.4mm, Optical Density:0.1	0.1		400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-0.1 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:0.1	0.1		400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-0.2 BK7, Reflective ND filter, Diameter=25.4mm, Optical Density:0.2	0.2		400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-0.3 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:0.3	0.3	50	400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-0.3 BK7, Reflective ND filter, Diameter=25.4mm, Optical Density:0.3	0.3	50	400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-0.5 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:0.5	0.5		400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-0.5 BK7, Reflective ND Filter, Diameter=25.4mm, Optical Density:0.5	0.5		400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-1 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:1	1	10	400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-1 BK7, Reflective ND Filter, Diameter=25.4mm, Optical Density:1	1	10	400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-1.5 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:1.5			400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-1.5 BK7, Reflective ND Filter, Diameter=25.4mm, Optical Density:1.5			400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-2 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:2	2		400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-2 BK7, Reflective ND Filter, Diameter=25.4mm, Optical Density:2	2		400-1200	25.4	2-3 Weeks	Request for quote
BK7-RNDF-50-3 BK7, Reflective ND Filter, Diameter=50mm, Optical Density:3	3		400-1200	50	2-3 Weeks	Request for quote
BK7-RNDF-25.4-3 BK7, Reflective ND Filter, Diameter=25.4mm, Optical Density:3	3		400-1200	25.4	2-3 Weeks	Request for quote
B270-RNDF-25.4-0.1 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.1					2-3 Weeks	Request for quote
B270-RNDF-25.4-0.2 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.2					2-3 Weeks	Request for quote
B270-RNDF-25.4-0.3 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.3					2-3 Weeks	Request for quote
B270-RNDF-25.4-0.4 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.4					2-3 Weeks	Request for quote
B270-RNDF-25.4-0.5 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.5					2-3 Weeks	Request for quote
B270-RNDF-25.4-0.8 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:0.8					2-3 Weeks	Request for quote
B270-RNDF-25.4-1 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:1					2-3 Weeks	Request for quote
B270-RNDF-25.4-2 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:2					2-3 Weeks	Request for quote
B270-RNDF-25.4-3 B270, Reflective Neutral Density Filter, Diameter=25.4mm, Optical Density:3					2-3 Weeks	Request for quote

B270-RNDF-25.4-3 - Parameter

B270-RNDF-25.4-2 - Parameter

B270-RNDF-25.4-1 - Parameter

B270-RNDF-25.4-0.8 - Parameter

B270-RNDF-25.4-0.5 - Parameter

B270-RNDF-25.4-0.4 - Parameter

B270-RNDF-25.4-0.3 - Parameter

B270-RNDF-25.4-0.2 - Parameter

B270-RNDF-25.4-0.1 - Parameter

BK7-RNDF-25.4-3 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-3 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-2 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-2 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-1.5 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-1.5 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-1 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-1 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-0.5 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.5

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-0.5 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.5

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-0.3 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.3

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-0.3 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.3

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-0.2 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.2

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-0.1 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.1

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-0.1 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

0.1

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-50-0.045 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

BK7-RNDF-25.4-0.045 - Parameter

Type

Reflective ND Filters

Material

BK7

Diameter (mm)

25.4

Diameter Tolerance (mm)

+0.0/-0.2

Thickness Tolerance (mm)

± 0.1

Surface Quality

60-40

Clear Aperture

>90%

Chamfer

<0.5mmx45°

Damage Threshold (pulsed)

7.5 J/cm2 (10ns/10Hz)

Thickness (mm)

Parallelism (arcmin)

Flatness

2.5λ@633nm

Optical Density

Peak Transmittance (%)

Bandpass Region (nm)

400-1200

B270-RNDF-25.4-3 - Download

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B270-RNDF-25.4-2 - Download

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B270-RNDF-25.4-1 - Download

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B270-RNDF-25.4-0.8 - Download

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B270-RNDF-25.4-0.5 - Download

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B270-RNDF-25.4-0.4 - Download

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B270-RNDF-25.4-0.3 - Download

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B270-RNDF-25.4-0.2 - Download

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B270-RNDF-25.4-0.1 - Download

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BK7-RNDF-25.4-3 - Download

Download

BK7-RNDF-50-3 - Download

Download

BK7-RNDF-25.4-2 - Download

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BK7-RNDF-50-2 - Download

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BK7-RNDF-25.4-1.5 - Download

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BK7-RNDF-50-1.5 - Download

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BK7-RNDF-25.4-1 - Download

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BK7-RNDF-50-1 - Download

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BK7-RNDF-25.4-0.5 - Download

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BK7-RNDF-50-0.5 - Download

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BK7-RNDF-25.4-0.3 - Download

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BK7-RNDF-50-0.3 - Download

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BK7-RNDF-25.4-0.2 - Download

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BK7-RNDF-50-0.1 - Download

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BK7-RNDF-25.4-0.1 - Download

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BK7-RNDF-50-0.045 - Download

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BK7-RNDF-25.4-0.045 - Download

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