Editing Raman spectroscopy (section)

=== Lasers ===
Raman spectroscopy requires a light source such as a laser. The resolution of the spectrum relies on the bandwidth of the laser source used.<ref name="MathiesFSRS">{{Cite journal|last1=Kukura|first1=Philipp|last2=McCamant|first2=David W.|last3=Mathies|first3=Richard A.|date=2007|title=Femtosecond Stimulated Raman Spectroscopy|journal=Annual Review of Physical Chemistry|volume=58|issue=1|pages=461–488|doi=10.1146/annurev.physchem.58.032806.104456|pmid=17105414|issn=0066-426X|bibcode=2007ARPC...58..461K}}</ref> Generally shorter wavelength lasers give stronger Raman scattering due to the {{mvar|ν}}<sup>4</sup> increase in Raman scattering cross-sections, but issues with sample degradation or fluorescence may result.<ref name="McCreery" />

[[Continuous wave]] lasers are most common for normal Raman spectroscopy, but [[pulsed laser]]s may also be used. These often have wider bandwidths than their CW counterparts but are very useful for other forms of Raman spectroscopy such as transient, time-resolved and resonance Raman.<ref name="MathiesFSRS" /><ref name="KCG">{{Cite journal|last1=Elliott|first1=Anastasia B. S.|last2=Horvath|first2=Raphael|last3=Gordon|first3=Keith C.|date=2012|title=Vibrational spectroscopy as a probe of molecule-based devices|journal=Chem. Soc. Rev.|volume=41|issue=5|pages=1929–1946|doi=10.1039/C1CS15208D|pmid=22008975|issn=0306-0012}}</ref>