||Laser Beam Fine Focus Analyzer
||Pedersen, David Bue (Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
||Olsen, Flemming Ove (Department of Manufacturing Engineering and Management, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Nielsen, Peter Carøe (Department of Manufacturing Engineering and Management, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||A method for monitoring and analyzing a laser beam is being researched. In this report one will be presented with the challenging task and the considerations that must be taken in order to monitor and construct a tool for analyzing the laser beam from an industrial laser.
Based on a known method presented in the 1983 by Lim G.C. and Steen W.M, Dept. of Metallurgy, Imperial College, London SW7, GB, it will be shown that it is possible to monitor a laser beam with a high resolution using a relatively simple approach.
Though this method back in 1983 was proven to provide inline feedback in the form of a beam intensity profile, the method was at the stage of discovery suffering from the lack of tools for strong numerical data processing and data logging.
Today these tools are readily available at an affordable price and at once the method is interesting again. An improved analyzing method based on the method of 1983 will be examined through a series of experiments. These will serve as a reference in the final development of a fine focus laser beam analyzer.
By using off-the-shelf electronic components a simple, yet advanced control system as well as driver software for the beam analyzer will be created which will aid in collecting analytical data through experiments. This will result in much better and more accurate datasets, than what is possible to achieve by collecting analytical data manually.
Through extensive mathematical analysis using numerical mathematical tools there will be developed a script based on existing source provided by Mr. Peter Carøe Nielsen. The script will be written in Matlab by Mathworks and will have the ability to automatically process data from the analyzer during experiments.
This data processing procedure gives a good picture of how the laser beam propagates. These data then serve as an aid in the monitoring and assessing the quality of the laser beam.
Furthermore a mechanical structure will be created. It will contain all the subsystems the analyzer is made of. It will provide the ability to measure the laser beam from different angles around the path of propagation, and it will be designed in a manner so that it can be used to measure most industrial or experimental lasers.
The laser beam analyzer is designed with ease-of–use in mind so that it can be operated after a short introduction. It can be connected to any personal computer, and it can capture measurement series unassisted by a human operator.
The beam analyzer is validated in terms of data density and consistency. This validation procedure forms the foundation for a number of suggestions for future work. The validation as well as future work is in conclusion presented to sum up the project.
Creation date: 2007-01-31
Update date: 2007-02-24