1. Transverse mode analysis of a laser beam by near- and far-field intensity measurements
- Author
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Rocco Pierri, Luigi Zeni, Antonello Cutolo, IIdegonda Izzo, Tommaso Isernia, Cutolo, A, Isernia, T, Izzo, I, Pierri, Rocco, and Zeni, Luigi
- Subjects
Physics ,business.industry ,Materials Science (miscellaneous) ,Near and far field ,Laser ,Industrial and Manufacturing Engineering ,Intensity (physics) ,Transverse mode ,law.invention ,Transverse plane ,Quality (physics) ,Optics ,law ,Laser beam quality ,Business and International Management ,business ,Excitation - Abstract
A quantitative measurement of laser-beam quality can be performed by determination of the presence of multiple transverse modes of the laser oscillator and by calculation of their power content. Along this line of argument, we discuss a new approach that, starting from near-field and far-field intensity measurements, can evaluate the complex excitation coefficients of the transverse modes in a laser beam. The exploitation of near-field measurements sharply improves the performances of the technique in those cases in which only far-field measurements are used. The validity of the method is confirmed by several accurate numerical simulations and by some experimental results relative to a multimode Q-switched Nd:YAG laser.
- Published
- 1995
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