All optical phase stepping for optical imaging with nonlinearity in specialty fiber

Seung Seok Lee; Joo Ha Kim; Bok-Hyeon Kim; Tae Joong Eom; Eun-Seo Choi

doi:10.1117/12.2078368

5 March 2015 All optical phase stepping for optical imaging with nonlinearity in specialty fiber

Seung Seok Lee, Joo Ha Kim, Bok-Hyeon Kim, Tae Joong Eom, Eun-Seo Choi

Proceedings Volume 9317, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XV; 931715 (2015) https://doi.org/10.1117/12.2078368
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

Refractive index variation in rare-earth doped specialty fiber can be possible through resonantly enhanced optical nonlinearity with the assistance of an optical pumping. The quantity of the variation under low-power optical pumping is enough to induce phase shift of 2π. By using this nonlinear effect in the specialty fiber, optical imaging system can perform phase shift-based optical imaging without mechanically controlled phase stepping. The pump-induced refractive index from the specialty fiber in reference arm of interferometer can produce optical delay depending on applied optical pumping power. At low optical power under few hundred mW, optical delay corresponding to 2π can be yielded in the reference arm efficiently. Contrast to the conventional mechanical phase stepping method, optically actuated phase stepping with the specialty optical fiber can avoid drawback of mechanical hysteresis and requirement of high voltage controllable electronics. The feasibility of the proposed method on optical imaging is suggested with demonstrating full range imaging in optical coherence tomography. Extended imaging range under optical phase stepping was successfully presented. The proposed method could be applied for detailed control of phase shift-based interferometry.

Citation Download Citation

Seung Seok Lee, Joo Ha Kim, Bok-Hyeon Kim, Tae Joong Eom, and Eun-Seo Choi "All optical phase stepping for optical imaging with nonlinearity in specialty fiber", Proc. SPIE 9317, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XV, 931715 (5 March 2015); https://doi.org/10.1117/12.2078368

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