Study on broadband third harmonic conversion efficiency with angular spectral dispersion

Broadband third harmonic conversion efficiencies of temporal phase modulation (TPM), linear chirped (LC) and chirped pulse stacking (CPS) lasers have been analyzed by adopting the schemes of type I/II KDP angle-detune and angular spectral dispersion (ASD) quantitatively. The result shows that the conversion efficiency of broadband lasers would be improved obviously by angular spectral dispersion and the suitable thickness of type II KDP crystal. Meanwhile, the conversion efficiency of the linear chirped laser is the largest when the broadband laser with the spectral bandwidth of 10–17 nm, and the chirped pulse stacking laser will exhibit the largest conversion efficiency among these three kinds of broadband lasers when the spectral bandwidth is broader.