Optical Bandpass Filters Specifications

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Optical Bandpass Filters Specifications

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Filters Application


			Filter Application refers to the desired wavelength range for the lens. This wavelength range is mostly dependent upon the filter material.
	Your choices are...
	Near Infrared		Filters that are designed for use in the 750 nm to 2500 nm wavelength range.
	Visible		Filters that are designed for use in the 380 nm to 750 nm wavelength range.
	Ultra-Violet		Filters that are designed for use in the 4 nm to 380 nm wavelength range.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Filter Geometry


	Filter Shape:		Filters can either come round, square, or rectangular.
	Your choices are...
	Circular		The filter is circular shaped.
	Square		The filter is square shaped.
	Rectangular		The filter is rectangular shaped.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Diameter, Square Side, or Rectangular Length:		If the filter is circular, the diameter. If the filter is square, the length of a side. If the filter is rectangular, the length of its largest side.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Rectangular Width:		If the filter is rectangular, the length of its shorter side.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Thickness:		The thickness of the filter.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Center Wavelength (CWL)


	Center Wavelength:		Center Wavelength (CWL) is the arithmetic mean of the pass band expressed in nanometers.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Full Width at Half Maximum (FWHM)


	Filter Bandpass:		Full Width at Half Maximum (FWHM) is a way of expressing bandpass, measured in nanometers, at the half-power points of the pass band.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Minimum Peak Transmittance (%)


	Minimum Peak Transmittance:		The minimum percent of transmitted light at the peak.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Filter Surface Quality


			Surface quality of the filter glass.
	Your choices are...
	10-5 Scratch / Dig		A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 10 / 5 indicates the average diameter of the digs to be .05 mm and the average length of a scratch is .10 mm.
	20-10 Scratch / Dig		A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 20 / 10 indicates the average diameter of the digs to be .10 mm and the average length of a scratch is .20 mm.
	40-20 Scratch / Dig		A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 40 / 20 indicates the average diameter of the digs to be .20 mm and the average length of a scratch is .40 mm.
	60-40 Scratch / Dig		A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 60 / 40 indicates the average diameter of the digs to be .40 mm and the average length of a scratch is .60 mm.
	80-50 Scratch / Dig		A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 80 / 50 indicates the average diameter of the digs to be .50 mm and the average length of a scratch is .80 mm.
	Other		Any other Scratch / Dig surface quality rating.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

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