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What is Raman Spectroscopy?
Raman spectroscopy is a method of chemical analysis that enables real-time
reaction monitoring and characterization of compounds in a non-contact
manner. The sample is illuminated with a laser and the scattered light
is collected. The wavelengths and intensities of the scattered light can
be used to identify functional groups in a molecule. It has found wide
application in the chemical, polymer, semiconductor, and pharmaceutical
industries because of its high information content and ability to avoid
sample contamination.
Why KOSI? -- The Complete Raman Solution.
A leader in Raman spectroscopy for over 13 years, Kaiser Optical
Systems, Inc., (KOSI) develops and manufactures a wide variety
of instruments and components for Raman spectroscopy. KOSI pioneered
the holographic technology that has revolutionized Raman spectroscopy.
Holographic notch filters allow collection of Raman scatter closer
to the Rayleigh line and with less ripple than conventional
dielectric
notch filters. Holographic transmission gratings enable the entire
Raman spectrum to be acquired simultaneously, instead of scanning
in bits and pieces, allowing superior calibration stability and
enabling true real-time analysis.
Superior NIR Performance
Because the intensity of the Raman signal is inversely proportional
to the fourth power of the excitation wavelength, it is advantageous
to use
as short a wavelength as possible. The shortest wavelengths commonly
used in Raman spectroscopy are in the visible region (532
and 632.8 nm). However,
these shorter-wavelength lasers can also excite fluorescence,
which can easily overwhelm the much weaker Raman signal. This
fluorescence can be
avoided by using longer-wavelength lasers in the near-infrared
(NIR) region. The weaker Raman signal resulting from NIR excitation
requires specialized
components optimized for maximum throughput and signal-to-noise
ratio in the NIR region.
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