22 Nov 2013
Laser diode sources operating at 638 nm have been used in pico projectors and other display applications due to their high brightness and low power consumption. Recently, these sources have become more stable, making them a viable option for Raman handheld or portable instruments. Many Raman instrument manufacturers have already started incorporating the 638 nm wavelength as an excitation option.
Raman scattered light is extremely weak in comparison to the intense excitation light, so high performance optical filters are essential to observe the Raman signal while suppressing the excitation and background sources.
Iridian’s 638 nm Raman edge pass filters provide high transmittance (>90% absolute) and low ripple (<±2%) for the Raman light in addition to an ultra-steep edge (cut-off < 50 cm-1) and better than OD 6 blocking at 638 nm. As a result, Iridian’s edge pass filters are able to provide more signal with less background.
Iridian’s new 638 nm laser line filter offers a narrow bandwidth (~2 nm FWHM), high transmittance, steep roll-off and wide blocking (300-1200nm). This reduces spectral noise without compromising transmittance at 638 nm.
Other recent additions to Iridian’s Raman product line include 405 nm filters, extended 1064 nm filters, and dichroic mirrors. Please check out www.iridian.ca to view these and other new product offerings from Iridian.
Iridian Spectral Technologies Ltd (Iridian) – Ottawa, ON, Canada – www.iridian.ca – Iridian is a diversified optical filter manufacturer that is an international leader in filter design and manufacture especially for application in the fields of fiber optic communications, optical spectroscopy, 3D entertainment, and in aerospace. Iridian was ranked as one of the top 150 high technology companies in Canada in the 2011 and 2012 Branham300 rankings and won the 2010 Canada Export Achievement Award for the province of Ontario sponsored by Profit magazine together with Export Development Corporation (EDC). Iridian is a global supplier with distributors in many countries particularly in Asia.
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