 When operated in the visible to near-infrared range, a Raman microscope can achieve lateral resolutions of approx.1 µm down to 250 nm, depending on the wavelength and type of objective lens (e.g., air "vs." water or oil immersion lenses).The depth resolution (if not limited by the optical penetration depth of the sample) can range from 1-6 µm with the smallest confocal pinhole aperture to 10s of micrometers when operated without a confocal pinhole.