22 May 1995 Integrated light spectroscopy of laser-induced breakdown in aqueous media
Author Affiliations +
In the scientific literature there is little information that describes the fundamental physical processes of laser induced breakdown (LIB) in transparent liquids. Our goal is to characterize these fundamental properties, which are critical to the understanding of retinal and other ophthalmic damage produced by ultrashort laser pulses. Laser pulses of 5.0 nanoseconds (ns) at less than 5.0 milli-Joules (mJ) per pulse and pulses of 80 picoseconds (ps) at 0.5 to 1.5 mJ per pulse from a Nd:YAG regenerative amplifier were used to produce LIB in a variety of aqueous media. These include physiological saline solution, triple-distilled water, and tap water. The resulting luminescent plasmas were analyzed using integrated light spectroscopy from a Chromex 0.25 meter (m) spectrograph. Plasmas were recorded in the wavelength region from 300 to 900 nm. Each spectrum obtained was analyzed using a Planck distribution for blackbody emission. The surface temperatures of the plasmas for the two pulse durations were computed to be in the 5000 K to 10,000 K range, depending on the pulse duration and energy. Also, the spectrographs from the saline solution included distinct spectral lines of emission over the broad band spectra, such as the 589 nm atomic emission line of sodium. We will discuss the time-integrated spectroscopy of LIB in various solution, and how LIB might mediate retinal damage induced by ultrashort laser pulses.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David J. Stolarski, Jennifer M. Hardman, Craig M. Bramlette, Gary D. Noojin, Robert J. Thomas, Benjamin A. Rockwell, and William P. Roach "Integrated light spectroscopy of laser-induced breakdown in aqueous media", Proc. SPIE 2391, Laser-Tissue Interaction VI, (22 May 1995); doi: 10.1117/12.209873; https://doi.org/10.1117/12.209873

Back to Top