18 May 2006 IR and visible wideband protection filter
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Abstract
Imaging and detection systems are susceptible to detector saturation or permanent damage caused by powerful light sources or high power lasers. We propose and demonstrate a passive, solid-state threshold-triggered optical protection filter. At input power below threshold, the filter has high transmission over the whole spectral band. However, when the input power exceeds the threshold power, transmission is decreased dramatically. As opposed to fixed spectral filters, which permanently block only specific wavelengths, the wideband filter is clear at all wavelengths until it is hit by damaging light. When high incident optical power impinges on the wideband filter at a certain spot, this spot becomes permanently opaque. The wideband protection filter is fast enough to block nanosecond laser pulses.
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Ram Oron, Ram Oron, Ariela Donval, Ariela Donval, Boaz Nemet, Boaz Nemet, Moshe Oron, Moshe Oron, Regina Shvartzer, Regina Shvartzer, } "IR and visible wideband protection filter", Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62062P (18 May 2006); doi: 10.1117/12.675283; https://doi.org/10.1117/12.675283
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