Deep-UV generation in an SBO crystal with an irregular domain structure

Random (stochastic) quasi-phase matching is demonstrated for broadband radiation in a one-dimensional irregular strontium tetraborate nonlinear photonic crystal. Harmonic generation tunable in the range 187.5 - 215 nm is achieved. The average power of the generated signal is a quadratic function of pump power and reaches 1 μW. In a steady-state model, taking into account sum frequency generation within the spectrum of the input light causes no broadening of the peaks in the spectrum of the generated signal. (nonlinear optical phenomena)