Measured performance of a refractive Gauss-to-flattop reshaper for deep-UV through near-IR wavelengths

John A. Hoffnagle; C. Michael Jefferson

doi:10.1117/12.446742

30 October 2001 Measured performance of a refractive Gauss-to-flattop reshaper for deep-UV through near-IR wavelengths

Proceedings Volume 4443, Laser Beam Shaping II; (2001) https://doi.org/10.1117/12.446742
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

A system of two plano-aspheric lenses which transforms a collimated, radially symmetric Gaussian beam to a flattop is described. To minimize diffraction of the output beam, the lenses were designed to accept essentially all (99.7%) of the input beam, and the output intensity distribution was chosen to have a controlled roll-off, given by the Fermi-Dirac function. Both aspheric surfaces were convex, simplifying fabrication by the technique of magnetorheological figuring. The optics were made of fused silica and, with suitable antireflection coatings, a single prescription can be used at any wavelength from 250 to 1550 nm. Measurements of the output intensity distribution were made by directly illuminating a CCD sensor with the flattop beam, and these results were compared quantitatively to the theoretical design. At the 8 mm diameter output aperture, 78% of the total beam power is contained in a region with 5% rms intensity variation, representing a fourfold improvement in power utilization over the Gaussian input. The beam propagates approximately 0.5 m without significant change in the intensity profile. Both the intensity uniformity and the propagation range are believed to be limited by the accuracy of the aspheric surfaces. It was verified that expanding the linear dimensions of the beam by the factor m increases by m² the range over which the beam retains its shape as it propagates. The optics have been successfully used in a holographic data storage test stand and for deep-UV interferometric lithography.

Citation Download Citation

John A. Hoffnagle and C. Michael Jefferson "Measured performance of a refractive Gauss-to-flattop reshaper for deep-UV through near-IR wavelengths", Proc. SPIE 4443, Laser Beam Shaping II, (30 October 2001); https://doi.org/10.1117/12.446742

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available