![]() ![]() 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%. These coatings are formed by vacuum deposition coating techniques and consist of two reflecting stacks, separated by an even-order spacer layer. Although this additional blocking component eliminates any unwanted out-of-band radiation, it also reduces the filter's overall transmission throughput. ![]() ![]() 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. This type of filter displays very high transmission in the bandpass region and blocks a limited spectral range of light on either side of the bandpass region. Laser Line and Bandpass filters transmit light in a narrow, well-defined spectral region while rejecting other unwanted radiation.
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