SPECIAL SECTION ON LASER BEAM SHAPING

Beam shaping with a plano-aspheric lens pair

[+] Author Affiliations
John A. Hoffnagle, C. Michael Jefferson

IBM Almaden Research Center, 650 Harry Road, San Jose, California?95120-6099 E-mail: hoffnagl@almaden.ibm.com

Opt. Eng. 42(11), 3090-3099 (Nov 01, 2003). doi:10.1117/1.1613957
History: Received Apr. 20, 2003; Revised Jun. 30, 2003; Accepted Jul. 1, 2003; Online October 31, 2003
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A pair of plano-aspheric lenses can be used to transform a collimated, radially symmetric, Gaussian beam to a radially symmetric flat-top beam. Diffraction of the output beam due to the choice of irradiance profile, as well as the finite aperture of the optics, must be considered if a propagating beam is required. Choosing both lenses to be positive, one can show that the aspheric surfaces are strictly convex, which facilitates fabrication by magnetorheological figuring. A fused silica lens pair is demonstrated, which can be used at any wavelength from 250 to 1550 nm to transform a Gaussian to a flat-top beam. Measurements of both the irradiance profile and phase of the output beam are presented and compared to the ideal design. These optics transform 78% of the total input beam power into the flat-top region of the output beam, which is uniform to better than 5% rms. For applications requiring uniform illumination, this represents a fourfold improvement in power utilization over the Gaussian input. The output wavefront is flat to a quarter wave at 514 nm, resulting in a beam that propagates approximately 0.5 m without significant change in profile. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

John A. Hoffnagle and C. Michael Jefferson
"Beam shaping with a plano-aspheric lens pair", Opt. Eng. 42(11), 3090-3099 (Nov 01, 2003). ; http://dx.doi.org/10.1117/1.1613957


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Variant of the method of Fox and Li dedicated to intracavity laser beam shaping. J Opt Soc Am A Opt Image Sci Vis 2011;28(3):489-95.
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