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Bandpass Filters
商品货号:ECS000781
商品品牌:Thorlabs
详细介绍

Features

  • Central Wavelengths from 340 nm to 1650 nm
  • 10 nm, 12 nm, 40 nm, and 70 nm Bandpass Regions
  • Engraved Filter Mount

Thorlabs' Bandpass Filters provide one of the simplest and most economical ways to transmit a well-defined wavelength band of light, while rejecting other unwanted radiation. Their design is essentially that of a thin film Fabry-Perot Interferometer formed by vacuum deposition techniques and consists of two reflecting stacks, separated by an even-order spacer layer. These reflecting stacks are constructed from alternating layers of high and low refractive index materials, which can have a reflectance in excess of 99.99%. By varying the thickness of the spacer layer and/or the number of reflecting layers, the central wavelength and bandwidth of the filter can be altered.This type of filter displays very high transmission in the bandpass region, but the spectral range of blocked light on either side of the bandpass region is narrow. To compensate for this deficiency, an additional blocking component is added, which is either an all dielectric or a metal-dielectric depending on the requirements of the filter.
Although this additional blocking component will eliminate any unwanted out-of-band radiation, it also reduces the filter's overall transmission throughput.

Using these methods, Thorlabs is capable of offering a wide range of BP filters from 340 nm - 1650 nm. Transmission curves for individual filters are available under the Drawings & Documents Tab. Each filter is mounted in a black anodized aluminum ring with an external diameter of 1" (25.4 mm). Please refer to the Accessories Tab for compatible optical mounts.

In addition to the standard bandpass filters listed below, custom filters can also be fabricated to support alternative central wavelengths or FWHM. To request a quote, please e-mail Tech Support or call us at 973-579-7227.

 

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