Lasers for Raman Spectroscopy
Single longitudinal mode and narrow spectrum linewidth lasers are ideal for Raman Spectroscopy.
UV lasers: 257nm, 261nm, 320nm and 360nm etc.
Visibale lasers: 405nm, 457nm, 473nm, 488nm, 514.5nm, 532nm, 633nm and 660nm etc.
IR lasers: 785nm, 808nm, 830nm, 980nm and 1064nm etc.
The selection of laser wavelength has a significant impact on sensitivity and spatial resolution of Raman experiments. Raman scattering intensity is proportional to λ-4 where λ is the laser wavelength. Thus, the shorter the laser wavelength, the better the sensitivity. The diffraction limited laser spot diameter can be calculated according to the equation, diameter = 1.22 λ / NA (where λ is the wavelength of the laser, and NA is the numerical aperture of the microscope objective being used). For given microscope objective, shorter laser wavelength offers better spatial resolution.
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