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Photonics Spectra
Apr 2004
Semrock Inc.Request Info
NOTCH FILTERS A line of deep optical thin-film notch filters for use with standard laser lines has been unveiled by Semrock Inc. for Raman spectroscopy, fluorescence and analytical instrumentation applications. Optical density is >6 attenuation of the laser line, and the filters maintain >90% transmission outside the notch. Typical notch width is 17 nm at 532 nm. The filters are made with hard-coating technology, without any adhesives in the optical path. The company says that the combination of stable ion-beam sputtering and proprietary deposition control technology and software results in filters that deliver high optical performance.


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The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
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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