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1 June 1992 Experimental implications of focal-plane behavior of Gaussian and top-hat beams
Sallie S. Townsend, Philip R. Cunningham
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Proceedings Volume 1625, Design, Modeling, and Control of Laser Beam Optics; (1992) https://doi.org/10.1117/12.58967
Event: OE/LASE '92, 1992, Los Angeles, CA, United States
Abstract
The location of focal planes and waists can be calculated using the equivalent Gaussian beam method. Predictions can be made for both Gaussian and top-hat (flat phase, flat irradiance profile) beams. A Fresnel number relationship is given where the waist of top-hat beams can be either within or outside the far field region. Experimental implications of this focal plane shift for top-hat and gaussian beams are discussed. The most important implication is that calculated reference power-in-the-bucket curves, used to calculate beam quality, may be off as much as 5% for top-hat beams, when not taking into account focal shifts for some optical systems.
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Sallie S. Townsend and Philip R. Cunningham "Experimental implications of focal-plane behavior of Gaussian and top-hat beams", Proc. SPIE 1625, Design, Modeling, and Control of Laser Beam Optics, (1 June 1992); https://doi.org/10.1117/12.58967
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