UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2001 Meeting


Section: Optics and Spectroscopy


Title:
LASER BEAM PARAMETERS MEASUREMENT


Authors:
A.Florean, I.Gruia*, M.Ristici*


Affiliation:
National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36 Magurele, Bucharest, 76900, Romania,

*Faculty of Physics, University of Bucharest, PO Box Mg 11 Bucharest, Romania


E-mail


Keywords:


Abstract:
Many modern applications of lasers require extremely high TEM00 Gaussian beam quality.Early a gaussian fit for the transverse intensity distribution was considered enough.Yet it has been shown that this criteria is not precise and reglementation ISO/11146 gives the M2 propagation factor as the quantity that quantifies laser`s performances .In our experiment a lens was put far away in front of the laser`s output in order to have acces at more than a Raleigh range from the waist beam . The auxiliary beam diameter was measured for five locations . A hyperbolic fit of the experimental data gives the propagation factor, the waist location, the waist diameter, the Raleigh range and the beam divergence . Using the thin lens transform equations the parameters of the original beam are obtained. Then we studied the influence of a Spectra -Physics collimator on the transversal field distribution .Our final goal is to use this laser in long-distance alignment applications . Bibliography 1.Tiberiu Tudor Bazele opticii coerente Bucuresti 1992 2. Carlos Roundy Propagation factor quantifies laser beam performance Laser Focus World December 1999 3.Thomas F. Johnstone, Jr Beam propagation (M2) measurement made as easy as it gets: the four-cuts method Apllied Optics 20 July 1998 Vol.37 No.21 4. M.Ristici & all Output mirror lens effect on laser beam parameters Optoelectronica Vol.3 , Nr. 3 Iulie -Septembrie 1995 5. A.Maitland and M.H.Dunn Laser Physics Amsterdam, 1969 6. I.M.Popescu Fizica ?i ingineria laserilor Editura Tehnica 2000 7. Test methods for laser beam parameters: Beam widths, divergence angle and beam propagation factor, Document ISO/11146