I-waveplate ye-wavelength ekabili isetshenziswa kabanzi ohlelweni Lwesithathu Lwe-Harmonic Generation (THG).Uma udinga ikristalu ye-NLO yohlobo lwe-II SHG (o+e→e), kanye nekristalu ye-NLO yohlobo lwe-II THG (o+e→e), i-polarization ephumayo evela ku-SHG ayikwazi ukusetshenziselwa i-THG.Ngakho-ke kufanele uguqule i-polarization ukuze uthole i-perpendicular polarization yohlobo lwe-II THG.I-waveplate ye-wavelength ekabili isebenza njenge-rotator eyenza i-polarizing, ingazungezisa ukuhlukaniswa kwe-polarization ye-beam eyodwa futhi ihlale i-polarization ye-beam.