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  • Raman Spectroscopy Mirrors
Mar 2013
Iridian Spectral TechnologiesRequest Info
OTTAWA, Ontario, Canada, March 18, 2013 — To complete its line of standard filters for Raman spectroscopy, Iridian is offering dichroic mirrors with high reflectance (>95%) at the laser line and high transmittance (>95%) of the Raman signal.

Because the scattered light in Raman spectroscopy is significantly weaker than the excitation light, high signal-to-noise optical filtering is critical. Typical Raman systems require laser-cleanup and edge-pass filters, and dichroic mirrors; these filter types are now offered for common Raman excitation wavelengths to enable the user to see more signal with less background.

Iridian, which has been producing Raman dichroic mirrors for OEMs for years, is now providing these filters as standard products. The company has dichroic mirrors for fluorescence, flow cytometry and custom applications.


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dichroic mirror
A mirror used to selectively reflect light according to its wavelength and not its plane of vibration.
flow cytometry
A method of measuring the characteristics of microscopic particles, usually cells, as they flow in a fluid stream through a beam of light. Particles may be stained with fluorescent dye and the fluorescence detected via laser illumination.
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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