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Raman spectroscopy

Raman spectroscopyInformation from Raman SpectroscopycharacteristicRaman frequenciescomposition MoS2,MoO3changes infrequency ofRaman Si 10 cm-1 shift per% strainpolarisation ofRaman peakcrystal symmetry orientation of CVDdiamond grainswidth of Ramanpeakquality amount of plasticdeformationparallelperpendiculari ntensity ofRaman peakamount thickness oftransparent coatingThe coupling of a Raman spectrometer withan optical microscope provides a number ofadvantages:1) Confocal Light collection2) High lateral spatial resolution3) Excellent depth resolution4) Large solid collection angle for theRaman lightCollecting the lightThe basic function of a Raman system Deliver the laser to the sampling point With low power loss through the system Illuminating an area consistent with sampling dimensions Provide a selection/choice of laser wavelengths Collect the Raman scatter High aperture High efficiency optics High level of rejection of the scattered laser light Disperse the scattered light Short wavelength excitation requires hi

The minimum laser focus is determined by: 1. the focusing optic N.A. 2. laser wavefront (distortion or M2) 3. How the back aperture of the objective is filled Laser focused spot size Delivering the light Raman spectroscopy utilizing a microscope for laser excitation and Raman light collection offers that highest Raman light collection efficiencies.

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