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Raman Filters

Photonics.com
Jan 2013
Iridian Spectral TechnologiesRequest Info
 
OTTAWA, Ontario, Canada, Jan. 2, 2013 — Improved 1064-nm filters have been added to Iridian Spectral Technologies Ltd.’s Raman filter offerings.

Noncontact identification of explosives and hazardous materials is an important application of portable and handheld Raman spectrometers. Excitation using 1064-nm sources reduces the fluorescence interference that is observed with shorter excitation wavelengths. Iridian has improved its 1064-nm laser line and long-pass filters by extending the operating range to 4000 cm−1 (1850 nm), enabling identification and analysis using features at Raman shifts beyond the fingerprint region.

Observing spectra without fluorescence is advantageous, but the trade-off is a weaker Raman signal intensity. This strengthens the need for high-signal-to-noise optical filters, which the company addresses by offering high-transmittance and deep-blocking filters that extend the wavelength range to provide more signal with less background.


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