Cutting and Altering Transparent Tissues with Ultrafast Lasers

Plasma emission from the focal area of a Bessel beamMulti-photon interactions allow deposition of energy inside transparent tissues. They can photo-dissociate molecules and, at higher energies, ionize tissue and produce visible plasma (dilectric breakdown). Thermal relaxation of the plasma can lead to explosive vaporization in the focal zone, which enables tissue cutting. We explore approaches to enhancement of the transparent tissue dissection and its alteration with ultrafast lasers.

Cataract surgery with ultrafast laser.We study various interaction mechanisms of ultrafast lasers with transparent tissues in UV, visible and IR parts of the spectrum, including photodissociation, ionization, and explosive vaporization, and develop applications of these interactions to adjustment of the tissue refractive index as well as to cataract and refractive surgery. Edges of lens capsule cut with the 1030nm fs laser at 10uJ and 400nm laser at 0.02uJ