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Bandpass Filters

Photonics Spectra
Dec 2009
Semrock Inc.Request Info

Semrock.jpgNear-IR hard-coated bandpass filters have been announced by Semrock. Keyed to popular laser lines in the 1500- to 1600-nm spectral region, they are suitable for use as laser source cleanup filters and as detection filters that pass particular laser wavelengths and that virtually eliminate background noise over the full InGaAs detector range from 850 to 1750 nm. They are optimized for retina-safe lasers in the 1.5-μm range. The filters match well with erbium-doped fiber and glass lasers at 1535 nm, erbium-doped fiber and InGaAsP semiconductor lasers at 1550 nm and Nd:YAG-pumped optical parametric oscillators at 1570 nm. Applications include laser radar, remote sensing, rangefinding and laser-induced breakdown spectroscopy. Standard filters are 25 mm in diameter, and custom sizes can be ordered.


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remote sensing
Technique that utilizes electromagnetic energy to detect and quantify information about an object that is not in contact with the sensing apparatus.
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