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Vibrational Spectroscopy

Confocal Raman Microscope

Location:  29A Shepherd Labs

Contacts:  Bing Luo

Instruction manual   [  PDF 80.3kB]

Confocal Raman Microscope Laser Safety Review   [  PDF 15kB]
Confocal Raman microscope uses a class IIIb Argon ion laser (wavelength 514.5nm, maximum output power ~50mW).  Serious injury may occur if users do not follow the operation procedure.  Users should be familiar with the laser safety document.  It is required that users sign and return this document to Dr. Jinping Dong after the training, but before operating the instrument alone.


Raman spectroscopy is used for structural characterization of organic and inorganic molecules in solids, liquids, gases, and on surfaces.  In Raman spectroscopy, irradiation excites chemical vibrations.  Changes in the wavelength of the scattered light appear as spectral peaks corresponding to different energies of excitation.  Rather than image one excitation, our new Witec confocal Raman microscope allows collection of a full spectrum at each pixel location, and in a matter of minutes.  Thus complex spectral fingerprints can be rendered in images.  Confocal Raman microscope allows one to do high resolution chemical mapping on materials in 2D and even 3D.


  • Optical resolution diffraction limited to ~250nm laterally and 500nm vertically
  • Spectral range of ~0-4000 cm-1, and spectral resolution down to 0.02 cm-1
  • Fast spectra acquisition (less than 100ms for a single spectrum)
  • Windows-based WitecControl_1.38 software for data collection and analysis; WitecProject software that can be installed on user's computer for offline data analysis
  • Omnichrome Argon ion laser with 514.5nm excitation and 50mW maximum output power

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