Laser Beam Profile Experiment

Beam spot size.

Laser beam profile experiment.

The spot size decreases with increasing beam radius at the focusing lens. Fig 1 beam profile of laser beam divergence. The spot size of the beam if the radial distance from the center of maximum irradiance to the 1 e2 points. Note the points in the graph where the intensity equals 1 e 2 of the maximum intensity say it as i e see fig 1.

Finally we learned that careful measurements of the beam profile such as ours can even be used to roughly. Beam diameter is defined as the distance across the center of the beam for which the irradiance i equals 1 e2 of the maximum irradiance. The experiment is repeated for different detector distances. In this project we learned not only about the changing profile and propagation of a laser beam we also discovered how to determine the length and mirror configuration of the laser cavity.

Specialized optics and coatings are required to profile beams under these circumstances. Beam divergence the beam divergence of an electromagnetic beam is an angular. Uv laser beam profiling newport supplies the lbp uvimg image converter for beam profiling of uv lasers. A gaussian beam results in a non uniform process that polishes some areas of the panel more effectively than others due to the differences in their thermal cycles.

Maiman at hughes research laboratories based on theoretical work by charles hard townes and arthur. Once you measure the inten sity proflle at a particular position you will be able to determine the spot size of the laser beam at that. Find the micrometer distance across the beam corresponding to these points b a from the fig 1 for a pair of detector. More information at www ophiropt c.

Gaussian proflle of a laser beam measurement of the spot size the purpose of this part of the experiment is to ver ify that the transverse beam intensity for the laser has a gaussian proflle. Some applications require a beam that is focused to a small spot. Learn how to measure lasers beams that are too large to be directly measured with a camera or scanning slit beam profiler. This concentration makes the laser beam useful for many applications in physics chemistry the medical industry and in industrial applications.

Finally a laser beam has a unique irradiance profile that gives it very significant characteristics. The converter employs a. The profile pattern of cw laser beam from the laser generator is gaussian beam instead of top hat beam where the spot is circular but with a uniform intensity profile. A single positive lens may be adequate for this purpose.

Spectrum it is frequently necessary to profile laser beams having wavelengths in the uv or ir regions. A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation the term laser originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by theodore h.