The nanosecond optical parametric amplifier of a weak signal based on BBO crystals

Parameters of the optical parametric amplifier (OPA), based on two BBO crystals were studied. The OPA was made with the schematic of the extraordinary wave walk off compensation. Efficient amplification of the weak signal (λ = 1053 nm) in the field of the strong pumping wave (λ = 532 nm) was obtained. The measured value of the amplification was equal to ~106. The noise level of the parametric amplifier was less than 10−3 from the signal level.