A Research System for Liquid Photo-induced Breakdown and Cavitation Effect

Abstract

The invention provides a research system for liquid light induced breakdown and a cavitation effect. Laser lights emitted by a pumping source module and a detection source module are subjected to beam combination through a dichroscope A; a 50% spectroscope, a 40x objective lens, a sample cell, a dichroscope, a focusing lens and a photoelectric detector are arranged in sequence in a direction of the principal optical axis of the dichroscope A; a laser energy power meter is arranged in a vertical direction of the 50% spectroscope; objective lenses are clung to three walls of the sample cell, wherein a 10x objective lens is connected with a high-speed camera, and a vertical LED light source is arranged on another wall of the sample cell; the photoelectric detector is connected with a oscilloscope. The research system provided by the invention can realize nanosecond laser induced liquid light induced breakdown, image information of cavitation bubbles formed during breakdown is monitored in real time, and information of laser energy is recorded at the same time; the research system provides a direct theoretical direction and a practical support for selecting a laser dosage and a mode of action and estimating an action effect during laser medical treatment.

Description

technical field [0001] The invention relates to an optical system, in particular to a research system for liquid photo-induced breakdown and cavitation effect. Background technique [0002] Laser technology has been applied in the field of biomedicine since the mid-1960s. By applying lasers with different energies and pulse widths to biological tissues, people have observed a variety of phenomena in which light interacts with tissues. Among them, the phenomenon of photoinduced breakdown in biological tissue occurs under the action of high power density and short pulse width laser, which is the focus and hotspot in the field of laser cavitation research in recent years. [0003] The physical process of photo-induced breakdown is: the strong laser ionizes the water near the focal point to form plasma, the plasma absorbs the subsequent laser light and expands outward, compresses the surrounding liquid medium to form a shock wave, the shock wave propagates to the far field and a...

AI Technical Summary

Problems solved by technology

However, due to the particularity of liquid properties and the complex phenomenon of liquid breakdown, the research on the physical mechanism of liquid photo-induced breakdown is still immature.

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