Rectangular Continuous ND Filters | SIMTRUM Photonics Store

BK7 has excellent transmission in general visual and near-infrared wavelengths, hence it is ideal to be used in Neautral Density Filters. BK7 Rectangular Continuous ND Filters can adjust the intensity of incoming light beam to be transmitted by translating it along its length axis. The spectrum passes through will continue to maintain its neutral spectrum energy distribution. It can eiher be metallic-alloy variable density sheets or low-inversion variable density sheets. This filter is commonly used in laser and medical application. By combining two filters, fixed density attenuation effect across a greater area can be obtained. The spectral range of our filters features a wavelength of 250-2500nm.

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
Type	Rectangular Continuous ND Filters
Dimensional Tolerance(mm)	±0.2
Standard Linearity	±5%
Standard Deviation of End Point	±5%
Surface Quality	40-20
Parallelism(arcmin)	<3
Chamfer	<0.5mmx45°
Damage Threshold(pulsed)	.5J/cm² (10ns/10Hz)

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	Dimension A (mm)	Dimension B (mm)	Spectral Range (nm)	Optical Density Range	Availability	Reference Price (USD)
BK7-RCNDF-76.2-1.0 BK7, Rectangular Continuous ND Filters, Ø=76.2mm, OD Range: 0.04-1.0	76.2	25.4	380-2000	0.04-1.0	2-3 Weeks	$85.00
BK7-RCNDF-76.2-1.5 BK7, Rectangular Continuous ND Filters, Ø=76.2mm, OD Range: 0.04-1.5	76.2	25.4	380-2000	0.04-1.5	2-3 Weeks	$85.00
BK7-RCNDF-76.2-2.0 BK7, Rectangular Continuous ND Filters, Ø=76.2mm, OD Range: 0.04-2.0	76.2	25.4	380-2000	0.04-2.0	2-3 Weeks	$85.00
BK7-RCNDF-76.2-3.0 BK7, Rectangular Continuous ND Filters, Ø=76.2mm, OD Range: 0.04-3.0	76.2	25.4	380-2000	0.04-3.0	2-3 Weeks	$85.00
BK7-RCNDF-76.2-4.0 BK7, Rectangular Continuous ND Filters, Ø=76.2mm, OD Range: 0.04-4.0	76.2	25.4	380-2000	0.04-4.0	2-3 Weeks	$85.00

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Rectangular Continuous ND Filters | SIMTRUM Photonics Store

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