Abstract

A pump (cw Ho–YAG laser) and probe (He–Ne laser) system was used to study the dynamics of the optical behavior of ocular tissue during laser heating. The nonlinear optical behavior of porcine corneal and vitreous-humor tissue was characterized in vitro by means of measurements of the radial profile of a He–Ne laser beam transmitted through the tissue. Temperature gradients in the tissue created by the absorption of pump radiation caused the probe beam to diverge. For constant laser power, the rate of divergence was made dependent on the spot size of the pump beam. The profile of the transmitted probe beam returned to its original magnitude and shape after the tissue was permitted to cool. This reversible change in optical behavior was attributed to the formation of a negative lens owing to thermally induced local gradients in the refractive index of the tissue.

© 1995 Optical Society of America

Dynamics of tissue optics during laser heating of turbid media

Wei-Chiang Lin, Massoud Motamedi, and Ashley J. Welch
Appl. Opt. 35(19) 3413-3420 (1996)

Role of tissue optics and pulse duration on tissue effects during high-power laser irradiation

Steven L. Jacques
Appl. Opt. 32(13) 2447-2454 (1993)

Myocardial temperature distribution under cw Nd:YAG laser irradiation in in vitro and in vivo situations: theory and experiment

Robert Splinter, Serguei Y. Semenov, Glenn A. Nanney, Laszlo Littmann, Jan R. Tuntelder, Robert H. Svenson, Chi Hui Chuang, and George P. Tatsis
Appl. Opt. 34(3) 391-399 (1995)

Highly efficient optical fiber sensor for instantaneous measurement of elevated temperature in dental hard tissues irradiated with an Nd:YaG laser

Zahraa J. Naeem, Ansam M. Salman, Rawaa A. Faris, and Abdulhadi Al-Janabi
Appl. Opt. 60(21) 6189-6198 (2021)

Experimental evaluation of mathematical models for predicting the thermal response of tissue to laser irradiation

Jorge H. Torres, Massoud Motamedi, John A. Pearce, and A. J. Welch
Appl. Opt. 32(4) 597-606 (1993)