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. 2010 Oct 27;1(4):1234–1243. doi: 10.1364/BOE.1.001234

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©2010 Optical Society of America

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially.

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Fig. 1 — (a) Schematic of the beam paths of double-clad fiber based endospectroscopy probe; (b) Schematic of the endospectroscopy system with chromatic and achromatic lenses. DM: dichroic mirror; FL: focusing lens; CL: coupling lens; DCF: double-clad fiber; PZT: piezoelectric transducer. In the aberrated system, a GRIN lens was used as the focusing unit. In the perfect achromatic system, a 10x/0.2NA Zeiss microscope objective was used to collimate the light from DCF, and a 20x/0.4 NA Zeiss microscope objective was used to focus the light to the sample.