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Stanley Knoel Freeman has written:

'Applications of raman spectroscopy' -- subject(s): Raman spectroscopy, Lasers

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Stanley Knoel Freeman has written:

'Applications of raman spectroscopy' -- subject(s): Raman spectroscopy, Lasers

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Trevor Robert Gilson has written:

'Laser Raman spectroscopy' -- subject(s): Raman spectroscopy, Lasers

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Raman spectroscopy has to do with lasers and lights and the way they separate. Because it has nothing to do with the human body, I would have to conclude that the results will in no way affect your chances of needing surgery.

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A good Raman light source should have the characteristics of monochromaticity, high intensity, and stability. The most common source used that meets these requirements are diode lasers. Not all diode lasers are equivalent, however, especially in regards to stability. A temperature-controlled lasing cavity is essential. In addition, the laser must have backscatter protection, that is, light that is emmitted from the laser cavity should not be reflected back into the cavity. Another stability enhancing feature is the incorporation of a laser bandpass filter inside the lasing cavity to eliminate broadband emission and ensure monchromaticity. The frequency of laser used depends on the application. The Raman scattering efficiency is proportional to the fourth power of the frequency, with visible lasers producing better efficiencies than near-infrared lasers. However, if the sample exhibits fluorescence, the fluorescence will be more pronounced with a visible laser than a near infrared laser. Typical laser wavelengths used in Raman spectroscopy are 532 nm (green) for non-fluorescent samples and will give excellent sensitivity. For fluorescent samples, 1000 nm or 1064 nm lasers are common. For most applications 785 nm lasers are a good compromise.

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Several variations of Raman spectroscopy have been developed.

· Surface Enhanced Raman Spectroscopy (SERS)

· Resonance Raman spectroscopy

· Surface-Enhanced Resonance Raman Spectroscopy (SERRS)

· Angle Resolved Raman Spectroscopy

· Hyper Raman

· Spontaneous Raman Spectroscopy (SRS)

· Optical Tweezers Raman Spectroscopy (OTRS)

· Stimulated Raman Spectroscopy

· Spatially Offset Raman Spectroscopy (SORS)

· Coherent anti-Stokes Raman spectroscopy (CARS)

· Raman optical activity (ROA)

· Transmission Raman

· Inverse Raman spectroscopy.

· Tip-Enhanced Raman Spectroscopy (TERS)

· Surface plasmon polaritons enhanced Raman scattering (SPPERS)

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