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Optical Engineering

Design and fabrication of a miniature objective consisting of high refractive index zinc sulfide lenses for laser surgery
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Paper Abstract

A miniature laser ablation probe relying on an optical fiber to deliver light requires a high coupling efficiency objective with sufficient magnification in order to provide adequate power and field for surgery. A diffraction-limited optical design is presented that utilizes high refractive index zinc sulfide to meet specifications while reducing the miniature objective down to two lenses. The design has a hypercentric conjugate plane on the fiber side and is telecentric on the tissue end. Two versions of the objective were built on a diamond lathe—a traditional cylindrical design and a custom-tapered mount. Both received an antireflective coating. The objectives performed as designed in terms of observable resolution and field of view as measured by imaging a 1951 USAF resolution target. The slanted edge technique was used to find Strehl ratios of 0.75 and 0.78, respectively, indicating nearly diffraction-limited performance. Finally, preliminary ablation experiments indicated threshold fluence of gold film was comparable to similar reported probes.

Paper Details

Date Published: 23 February 2016
PDF: 8 pages
Opt. Eng. 55(2) 025107 doi: 10.1117/1.OE.55.2.025107
Published in: Optical Engineering Volume 55, Issue 2
Show Author Affiliations
Adam Shadfan, Rice Univ. (United States)
Michal Pawlowski, Rice Univ. (United States)
Ye Wang, Rice Univ. (United States)
Kaushik Subramanian, The Univ. of Texas at Austin (United States)
Ilan Gabay, The Univ. of Texas at Austin (United States)
Adela Ben-Yakar, The Univ. of Texas at Austin (United States)
Tomasz Tkaczyk, Rice Univ. (United States)

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