title: Effect of multiphoton ionization on performance of crystalline lens.
abstract: This Letter presents a model for propagation of a laser pulse in a human crystalline lens. The model contains a transverse beam diffraction effect, laser-induced optical breakdown for the creation of plasma via a multiphoton ionization process, and the gradient index (GRIN) structure. Plasma introduces the nonlinearity in the crystalline lens which affects the propagation of the beam. The multiphoton ionization process generates plasma that changes the refractive index and hence leads to the defocusing of the laser beam. The Letter also points out the relevance of the present investigation to cavitation bubble formation for restoring the elasticity of the eyes.
authors.forename: Pradeep Kumar
authors.initials: PK
authors.lastname: Gupta
authors.forename: Ram Kishor
authors.initials: RK
authors.lastname: Singh
authors.forename: D
authors.initials: D
authors.lastname: Strickland
authors.forename: M C W
authors.initials: MC
authors.lastname: Campbell
authors.forename: R P
authors.initials: RP
authors.lastname: Sharma
mesh_terms: D006801:Humans; D007834:Lasers; D007908:Lens, Crystalline / Q000528:radiation effects*; D055620:Optical Phenomena; D017785:Photons