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Mechanical response of agar gel irradiated with Nd:YAG nanosecond laser pulses.

Summary: Mechanical response of agar gel irradiated with Nd:YAG nanosecond
laser pulses.
Francisco G. Pérez-Gutiérrez1
, Rodger Evans2
Santiago Camacho-López2
, Guillermo Aguilar1
1. Department of Mechanical Engineering, University of California, Riverside; 900 University
Ave, Riverside, CA, USA 92521.
2. Departamento de Óptica, Centro de Investigación Científica y de Educación Superior de
Ensenada; Km. 107 Carretera Tijuana - Ensenada C.P. 22860, Ensenada, B.C., México.
Nanosecond long laser pulses are used in medical applications where precise tissue ablation with minimal thermal and
mechanical collateral damage is required. When a laser pulse is incident on a material, optical energy will be absorbed
by a combination of linear and nonlinear absorption according to both: laser light intensity and material properties. In the
case of water or gels, the first results in heat generation and thermoelastic expansion; while the second results in an
expanding plasma formation that launches a shock wave and a cavitation/boiling bubble. Plasma formation due to
nonlinear absorption of nanosecond laser pulses is originated by a combination of multiphoton ionization and thermionic
emission of free electrons, which is enhanced when the material has high linear absorption coefficient. In this work, we
present measurements of pressure transients originated when 6 ns laser pulses are incident on agar gels with varying
linear absorption coefficient, mechanical properties and irradiation geometry using laser radiant exposures above


Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside


Collections: Engineering