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Thorlabs FB850-40 Bandpass Filter, US $75.00 – Picture 0
Thorlabs FB850-40 Bandpass Filter, US $75.00 – Picture 0

Thorlabs Fb850-40 Bandpass Filter

US $75.00

  • Fort Worth, Texas, United States
  • Jan 29th
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 FB850-40 - ?1" Bandpass Filter, CWL = 850 ± 8 nm, FWHM = 40 ± 8 nm Laser Line and Bandpass filters provide a simple and economical way to transmit a light in a narrow, well-defined spectral region 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.
Condition:
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...
Brand Thorlabs

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