Linear microscopy	Microscopy using on a linear contrast mechanism (the signal scales linearly with the laser illumination intensity).
Nonlinear microscopy	Microscopy using on a nonlinear contrast mechanism (the signal scales nonlinearly with the laser illumination intensity), including 2PEF, SHG, THG, CARS, and SRS signals.
Multiphoton microscopy	Synonym to nonlinear microscopy.
1p	1-photon (corresponding to a linear excitation)
2p	2-photon (corresponding to a nonlinear excitation)
Contrast mechanisms:
1PEF	1-Photon Excited Fluorescence
2PEF	2-Photon Excited Fluorescence
SHG	Second Harmonic Generation
THG	Third Harmonic Generation
CARS	Coherent Anti-stokes Raman Scattering
SRS	Stimulated Raman Scattering
Microscope implementation:
Point-scanning 2p-microscopy	Microscopy based on 2PEF signal using raster scanning of single point (also called TPLSM, 2p-LSM, 2p-microscopy, 2PEF microscopy, two-photon microscopy in the literature).
Light-sheet illumination	Microscopy using light-sheet illumination in orthogonal geometry (also called SPIM, DSLM, Plane illumination microscopy,… in the litterature)
Light-sheet 2p-microscopy	Microscopy based on 2PEF signal using light-sheet illumination (also called 2p-SPIM in [16])
Light-sheet 1p-microscopy	Microscopy based on 1PEF signal using light-sheet illumination (also called 1p-SPIM in [16], DSLM in [20])
Multifocal Multiphoton Microscopy	Microscopy based on 2PEF signal using raster scanning of multiple points