Second harmonic generation
Driving field at frequency w producing a nonlinear polarisation at frequency 2w
Polarisation at frequency 2w is given by
- Polarisation at frequency w is given by
deff is an effective nonlinear coefficient that depends on the direction of propagation and polarisation of the fields etc.
- We now assume a steady state (d/dt=0) and a losslesss medium (a=0) to obtain expression for the growth of the field at frequency w and 2w given by