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Measurement of the mode coherence coefficients

: Du, K.-M.; Herziger, G.; Rühl, F.


Optical and Quantum Electronics 24 (1992), pp.1119-1127 : Abb.,Lit.
ISSN: 0306-8919
ISSN: 1572-817X
Journal Article
Fraunhofer ILT ()
arbitrary parameter; basis of eigenfunction; centre coordinate; double-point interferometer; equivalent resonator; high power laser; mode coherence coefficient; mutal intensity; polarized laser beam

Based on average intensity distributions at two axial positions, an experimental approach to determine the mode coherence coefficients was developed. Using this approach, investigations were carried out for a COsub2 laser with a stripe resonator. The power partitions of, and cross-correlations between, modes at different aperture widths and the dependence of the beam quality on the aperture width were studied. The measuring principle, an iterative fit method, and some experimental results are presented and discussed.