Accession Number : ADA294575

Title :   Laser-Induced Acoustic and Shock Waves in Ocular Tissues.

Descriptive Note : Final rept.,

Corporate Author : ANALYTIC SCIENCES CORP SAN ANTONIO TX

Personal Author(s) : Oraevsky, Alexander A.

PDF Url : ADA294575

Report Date : MAY 1995

Pagination or Media Count : 37

Abstract : Analytical expressions that describe the generation and propagation of acoustic and shock waves in biological tissues are presented. Several practical situations of laser irradiation of various ocular tissues have been considered and these include thermoelastic generation of acoustic waves, linear and nonlinear effects that occur upon propagation of stress transients in tissues, cylindrical shock wave generation upon plasma optical breakdown in the caustic of a focused laser beam, and spherical shock wave generation upon thermal explosion of melanosomes. The transformation of light energy into heat and then to mechanical stress is analyzed for ultrashort-pulse laser irradiation of absorbing tissues, and thermo-optical generation of high-amplitude acoustic waves and the formation of shock waves are reviewed. Stress wave alteration upon propagation through various media is considered along with acoustic wave reflection from boundaries and acoustic wave transmission through interfaces. Finally, nonlinear propagation of high-amplitude acoustic waves is covered.

Descriptors :   *TISSUES(BIOLOGY), *SHOCK WAVES, *LASER BEAMS, STRESSES, THERMAL PROPERTIES, TRANSIENTS, PROPAGATION, MECHANICAL PROPERTIES, ACOUSTIC WAVES, ENERGY, LIGHT, EXPLOSIONS, LASER APPLICATIONS, NONLINEAR SYSTEMS, WAVE PROPAGATION, CYLINDRICAL BODIES, MATHEMATICAL ANALYSIS, LINEARITY, SOUND TRANSMISSION, FOCUSING, EYE, IRRADIATION, TRANSFORMATIONS, STRESS WAVES, ACOUSTIC REFLECTION, CAUSTICS, THERMOELASTICITY, NONLINEAR PROPAGATION ANALYSIS.

Subject Categories : Anatomy and Physiology
      Lasers and Masers
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE