The following links show examples of Raman spectra of different materials.  Please look at these examples to compare and contrast the axes of the plots.

What is raman spectroscopyand how does it work

National University of Ireland, Galway. Small Molecule/Forensics Research. (ret. 3/17/2019) http://www.nuigalway.ie/nanoscale/researchprojects/forensicsraman/

The x axis of a conventional Raman spectra is plotted in wavenumber (cm-1) units, not in wavelength.  For a review of wavenumbers, see 3.7 Electromagnetic Energy: Units Conversion.

Sylvia-Monique Thomas. Infrared and Raman spectroscopy. (ret. 3/17/2019) https://serc.carleton.edu/NAGTWorkshops/mineralogy/mineral_physics/raman_ir.html

What is raman spectroscopyused for

Analytical Methods in Geosciences Copyright © by Elizabeth Johnson and Juhong Christie Liu is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.

The counts from the detector are plotted in the y-axis, which is why people report this in different ways.  Peak intensity in reflectance spectra can vary due to experimental conditions, count times, orientation of the sample, surface characteristics, etc.

What is raman spectroscopyin chemistry

Concept Check 7.3.2. If a violet laser is passed through a sample of water, do you think the Raman scattered light would still be red, like the example above?  Why or why not? (Hint:If the laser was changed to 364 nm, at what wavelength would the major peak of water appear?)

7.3.1. In this example, Raman scattering from liquid water is shown.  What is the wavelength of the laser in nm, and what is the wavelength of Raman scattered light for the major peak of water (as stated in the video?)

In practice, Raman spectra are plotted as Raman shift.  Raman shift is the difference between the peak energies and the excitation laser energy.  This allows comparison of a spectrum to other spectra even when different laser excitation energies are used.

What is raman spectroscopyprinciple

7.3.3. In the olivine spectrum, what is the energy difference between the tallest peak and the laser energy, in wavenumbers?

Raman spectra are plotted in units of intensity (which can be arbitrary) versus Raman shift in wavenumbers (cm-1).  The Raman shift is used so that data can be easily compared even when different laser wavelengths are used.

InPhotonics. InPhotote Spectrometer Data. (ret. 3/17/2019) http://www.inphotonics.com/INPdata.htm NanophotonGlobal. (January 6, 2017).