Theoretical studies on optimization of a broadband optical parametric amplifier for enhanced output stability

In this paper, we report theoretical studies on optimization of a broadband optical parametric amplifier (OPA) with enhanced output stability for chirped pulse amplification. Optimization of various signal, pump, crystal and ambient parameters has been carried out to achieve an output energy fluctuation that is much smaller than the pump fluctuation. Different practical examples of single/multi stage OPAs and single/ multi pass OPAs, operating in many optical cycles and few optical cycles regimes have been considered in our studies. It is shown that apart from several crystal and beam parameter parameters, crystal temperature and inter/ intra crystal losses constitute important parameters which can be varied to achieve stable broadband pulse amplification in an optical parametric amplifier.