Experimental verification of focusability of coherent annular laser beams

Dimo N. Astadjov; Om Prakash

doi:10.1117/12.2012473

15 March 2013 Experimental verification of focusability of coherent annular laser beams

Dimo N. Astadjov, Om Prakash

Proceedings Volume 8770, 17th International School on Quantum Electronics: Laser Physics and Applications; 87701O (2013) https://doi.org/10.1117/12.2012473
Event: Seventeenth International School on Quantum Electronics: Laser Physics and Applications, 2012, Nessebar, Bulgaria

Abstract

Experiments of focusing coherent laser beams being diffracted on annular aperture are carried out in order to verify issues of a two-dimensional Fast Fourier Transform simulation of coherent pure (dark) annular flat beams done and published before. The beam pattern at focal plane (aka the far-field pattern) is a prominent central peak and faint concentrical rings around it. In the course of simulation we calculate the fraction of the central peak power to the whole power of beam that gives a notion of power spread within the focal spot. This fraction is a function of beam annularity i.e. ‘inside diameter /outside diameter’ ratio. The experimentally-measured dependence of the central peak power to the whole power of beam versus the annularity of pure annular laser beams was the major target of the report. The purpose was to verify experimentally the issues of our earlier simulation. We found that from the five experimental points four of them are within 16% error as to the simulated dependence which is tolerable in such a measurement.

Citation Download Citation

Dimo N. Astadjov and Om Prakash "Experimental verification of focusability of coherent annular laser beams", Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87701O (15 March 2013); https://doi.org/10.1117/12.2012473

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