939 research outputs found
Nonclassical states of the second optical harmonic in the presence of self-action
The quantum theory of coherent radiation frequency doubling in crystals with quadratic and cubic optical nonlinearities is developed. The possibility of producing the quadrature-squeezed state of the second harmonic (SH) field is shown. The nonclassical SH states arise due to self-action effect
Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction
We analyze second-harmonic generation (SHG) in a two-dimensional nonlinear optical superlattice (NLOS) with
its modulation period being chirped in the propagation direction and constant in the transverse direction.
This results in efficient multiple SHG via nonlinear RamanβNath diffraction. We obtain exact analytical expressions
for a SH amplitude generated in chirped 2D NLOSs and for its quasi-phase-matching bandwidth. The
results of analytical calculations are in excellent agreement with the numerical ones. We show that the process
is robust to angular deviations of NLOS and it can be applied to enable tunable and broadband frequency
conversion
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