Time Dependent Quadratic Hamiltonians,SU(1,1), SU(2), SU(2,1) and SU(3)
  The properties of SU(1,1) SU(2),SU(2,1) and SU(3) have often been used in quantum optics. In this paper we demonstrate the use of these symmetries. The group properties of SU(1,1) SU(2), and SU(2,1) are used to find the transition probabilities of various time dependent quadratic Hamiltonians. We consider Hamiltonians representing the frequency converter,parametric amplifier and raman scattering.These Hamiltonians are used to describe optical coupling in nonlinear crystals. 
Paul Croxson