Are all Raman microscopes confocal?

No.  Some Raman microscopes do not have confocal optics.

Simply adding a microscope assists in giving lateral (XY) spatial resolution, but does not give depth (Z) spatial resolution.  For this confocal optics are required.  There are several methods in use today, some truly confocal, others pseudo confocal, which work with varying success.  With a true confocal design (which incorporates a fully adjustable confocal pinhole aperture) micron depth resolution is possible, allowing individual layers of a sample to be discretely analysed.

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