Dual wavelength waveplate imagwiritsidwa ntchito kwambiri pa Third Harmonic Generation (THG) system.Mukafuna kristalo wa NLO wa mtundu wa II SHG (o+e→e), ndi galasi la NLO la mtundu II THG (o+e→e), polarization yochokera ku SHG singagwiritsidwe ntchito pa THG.Chifukwa chake muyenera kutembenuza polarization kuti mupeze ma perpendicular polarization amtundu wa II THG.Mawaveplate amitundu iwiri imagwira ntchito ngati polarizing rotator, imatha kutembenuza polarization ya mtengo umodzi ndikukhalabe polarization ya mtengo wina.
Ndibwino kuti mukuwerenga Standard Wavelength: