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20 February 2020 Performance comparison of the fiber axicon probe having extended Bessel focus with cleaved fiber tip probe
P. Gupta, K. Vairagi, S. Mondal
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Proceedings Volume 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX; 112331B (2020) https://doi.org/10.1117/12.2544567
Event: SPIE BiOS, 2020, San Francisco, California, United States
Abstract
In this work, a negative axicon is fabricated at the tip of an optical fiber probe by chemical etching in hydrofluoric acid which produces superior quality Bessel beam. It has large depth of focus, ~700μm along with a small central spot size, ~2μm. This negative axicon probe is utilized in a common-path optical coherence tomography (CP-OCT) setup which overcome the polarization mismatch and group velocity dispersion as both sample and reference beam travels from the similar physical path. This probe eliminates the trade-off between lateral resolution and penetration depth of the optical coherence tomography for high resolution imaging with large imaging depth. The performance of the optical fiber negative axicon probe is compared with the cleaved fiber tip. It is observed that the quality of OCT image for negative axicon probe is better than the cleaved tip. The working distance between the sample and probe for axicon probe is in larger than the cleaved tip. This axicon tip probe has great potential in endoscopic OCT in future for probing the deep tissue.
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P. Gupta, K. Vairagi, and S. Mondal "Performance comparison of the fiber axicon probe having extended Bessel focus with cleaved fiber tip probe", Proc. SPIE 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX, 112331B (20 February 2020); https://doi.org/10.1117/12.2544567
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KEYWORDS
Axicons
Optical coherence tomography
Optical fibers
Bessel beams
Image resolution
Wet etching
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