Raman spectroscopy involves exciting a sample with a laser beam and then analyzing the Stokes and/or Anti-Stokes emitted light. This technology is used in bench top and hand held optical instruments to identify unknown chemical or molecular compounds as the Stokes/Anti-Stokes emitted light is essentially a spectral fingerprint of the sample that is being illuminated.
Since the emitted light is very close in wavelength to the excitation light, very steep filters (notch or edge pass) filters are required in order to attenuate the laser signal from reaching the detector while transmitting the weak emitted light signal. In addition, Raman laser line filters, with high transmittance and extended deep blocking, are required to ensure only the desired wavelength illuminates the sample.
Iridian supplies a number of the leading OEMs with the optical Raman filter technology required for their analytical instrumentation and also serves the replacement market.
For further information on the Iridian’s Raman filters, please click on the following:Raman Laser Line Filters
Raman Notch Filters
Raman Edge Filters
Dichroic Long Pass Filters (Laser Lines)
Raman Spectroscopy Tutorial
Iridian offers custom designs and prototypes to high volume manufacture of Raman notch, edge or laser line filters. Please contact us for further information.