The analysis of the third harmonic generation schemes for ICF drivers

In this paper, using numerical calculation,we analyzed the type Ⅰ/type Ⅱ angle detuning and type Ⅱ/type Ⅱ polarization mismatching third harmonic generation (THG) scheme,and gave the tripling frequency transferring efficiency curves.Meanwhile the laser pulse shape of the fundamental beam is flat in space and Gaussian in time,or extra Gaussian (sixth order) in space and Gaussian in time.With the variation of input intensity from 0 to 10GW/cm2, the tripling transfer efficiency changed,and at the point of 5GW/cm2 the optimum tripling efficiency obtained.This paper has the important reference value to THG experiments for ICF.