Laser Spark

Laser Spark

 

the transition of a substance to the state of a strongly ionized hot gas—a plasma—under the action of an electromagnetic field of optical frequency. Such laser-induced breakdown is similar to microwave breakdown and was first observed in 1963 when the radiation of a powerful pulsed ruby laser was focused in air.

When the phenomenon occurs, a spark arises at the focus of the lens; the observer perceives a bright flash accompanied by a loud sound. For gases, the values of the light flux intensity in the laser beam that are needed to reach the breakdown threshold are ∼ 109-1011 watts/cm2, corresponding to an electric field strength of 106-107 volts/cm. The observation of laser sparks stimulated research on the propagation and maintenance of a gas discharge by a laser beam for the purpose of creating optical plasmatrons (seeLASER RADIATION, EFFECTS OF).

Laser sparks are also observed in condensed media when powerful laser radiation is propagated in such media. Laser sparks can cause damage to materials and optical parts in laser devices.

REFERENCES

Raizer, Iu. P. Lazernaia iskra i rasprostranenie razriadov. Moscow, 1974.
MacDonald, A. Sverkhvysokochastotnyiproboi v gazakh. Moscow, 1969. (Translated from English.)

V. B. FEDOROV

References in periodicals archive ?
Objective: The objective of LASIG-Twin is to create a networking collaboration between the Romanian National Institute for Laser, Plasma and Radiation Physics (INFLPR) and its Laboratory of Solid-State Quantum Electronics (ECS) and four other high renowned institutes from Germany, the UK and France, providing a unique opportunity for INFLPR and its partners to significantly increase their science excellence and visibility, technology innovation capacity and industrial exploitation capability in the fields of laser spark plug for fossil fuel efficient combustion fundamentals and applications.
Spectroscopic analysis of Liquids using Laser Spark.
Techniques include optical emission, laser spark, Wavelength Dispersive X-Ray fluorescence (WDXRF), Energy Dispersive X-Ray Fluorescence (EDXRF), X-Ray Diffraction (XRD), and automation of spectrometers.
The radiation from the laser spark is collected with a bifurcated optical fiber connected to a dual-channel Ocean Optics mini-spectrometer (SD2000, Ocean Optics, Inc.
CTR attracted worldwide attention with its first laser spark plug in miniature format.
The laser sparks a chemical reaction in the drug, which inflames the tumor.
have shown that the production of laser sparks in or near the focal plane of reticle-based missiles can be extremely effective in creating a false target, resulting in break-lock, within the missile's sensor suite.