  We propose methods for realization of continuous two photon source using
coherently pumped quantum dot embedded inside a photonic crystal cavity. We
analyze steady state population in quantum dot energy levels and field inside
the cavity mode. We find conditions for population inversion in coherently
pumped and incoherently pumped quantum dot. We show that squeezing in the
output for two two photon laser is not visible using coherent as well as
incoherent pump. We discuss effect of phonon coupling using recently developed
polaron transformed master equation at low temperatures. We also propose scheme
for generating squeezed state of field using four wave mixing.
