NLO	Nonlinear optical
ICT	Intramolecular charge transfer
RSA	Reverse saturable absorption
SA	Saturable absorption
NLA	Nonlinear optical absorption
SAs	Saturable absorbers
OLs	Optical limiters
DMSO	Dimethyl sulfoxide
FMO	Frontier molecular orbital
NTO	Natural transition orbital
TAS	Transient absorption spectroscopy
DFT	Density functional theory
TD-DFT	Time-dependent density functional theory
OPA	Optical parametric amplifier