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638-nm Optical Filters

Photonics.com
Aug 2013
Iridian Spectral TechnologiesRequest Info
 
OTTAWA, Ontario, Canada, Aug. 20, 2013 — Iridian Spectral Technologies’ 638-nm optical filters for Raman spectroscopy allow users to observe the Raman signal while suppressing excitation and background sources.

The Raman edge pass filters provide >90% absolute transmittance and <±2% ripple for the Raman light. They also provide an ultrasteep edge with cutoff <50 cm–1 and optical density >6 blocking at 638 nm.

The 638-nm laser line filters offer a ~2-nm full width half maximum bandwidth, high transmittance, steep roll-off and blocking from 300 to 1200 nm. 


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GLOSSARY
Raman spectroscopy
That branch of spectroscopy concerned with Raman spectra and used to provide a means of studying pure rotational, pure vibrational and rotation-vibration energy changes in the ground level of molecules. Raman spectroscopy is dependent on the collision of incident light quanta with the molecule, inducing the molecule to undergo the change.  
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