Optical Design and Engineering

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

[+] Author Affiliations
Adam Shadfan, Michal Pawlowski, Ye Wang

Rice University, Tkaczyk Group, Department of Bioengineering, 6100 Main Street, Houston, Texas 77005, United States

Kaushik Subramanian, Ilan Gabay

University of Texas at Austin, Ben-Yakar Group, Mechanical Engineering Department, 1 University Station C2200, Austin, Texas 78712, United States

Adela Ben-Yakar

University of Texas at Austin, Ben-Yakar Group, Mechanical Engineering Department, 1 University Station C2200, Austin, Texas 78712, United States

University of Texas at Austin, Ben-Yakar Group, Biomedical Engineering Department, 1 University Station C0800, Austin, Texas 78712, United States

Tomasz Tkaczyk

Rice University, Tkaczyk Group, Department of Bioengineering, 6100 Main Street, Houston, Texas 77005, United States

Rice University, Electrical and Computer Engineering Department, 6100 Main Street, Houston, Texas 77005-1892, United States

Opt. Eng. 55(2), 025107 (Feb 23, 2016). doi:10.1117/1.OE.55.2.025107
History: Received November 19, 2015; Accepted January 27, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Adam Shadfan ; Michal Pawlowski ; Ye Wang ; Kaushik Subramanian ; Ilan Gabay, et al.
"Design and fabrication of a miniature objective consisting of high refractive index zinc sulfide lenses for laser surgery", Opt. Eng. 55(2), 025107 (Feb 23, 2016). ; http://dx.doi.org/10.1117/1.OE.55.2.025107


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