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Inthispaper,wediscusstheoreticallythesolitonpropertiesoflightpulsetransportationoriginatingfromstrongnonlinearin teractionsbetweenionsinunitcellsofioniccrystals,andanalyzeindetailthebrightsolitonsanddarksolitonswhenthenonlinearcoefficientgispositiveandnegative.Itisfoundthatwhetherthenonlinearcoefficientgispositiveornegative,thebrightsolitonscanbeobtainedoverthelongitudinalopticalphononfrequencyωLO.Forg >0 ,darksolitonscanbeformedunderthetransverseopticalphononfrequencyωTO,whatshouldbepayedattentiontoisthatbetweenωTOandωLO,thelightpulsecanformadvanceddarksolitons.Forg <0 ,thereisaswitchingareafromtheadvancedbightsolitontoretardeddarksolitonnearbutbelowωTO.Wealsodiscusstheeffectsofhighernonlineardispersionsonthesolitons.
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Keywords:
- soliton ,polariton ,lightpulse /
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