Reflective axicon based energy-efficient extended depth of focus quasi-Bessel beam probe for common-path optical coherence tomography.
Appl Opt
; 62(3): 511-517, 2023 Jan 20.
Article
em En
| MEDLINE
| ID: mdl-36821252
ABSTRACT
This work presents an optical fiber negative/reflective axicon probe that generates an energy-efficient quasi-Bessel beam (QBB) having a central spot (CS) possessing â¼20% of the QBB power. With silver coating around the axicon, the CS power has been increased by â¼45%. The QBB possesses a large depth of field, â¼400µm, with a micron order spot size as obtained experimentally. The probe has further been explored for common-path optical coherence tomography. The probe length has been optimized to minimize the path length difference between the reference and sample signal. With a divergence angle of just 0.013°, the beam provides a lateral resolution of â¼2.5 to â¼16µm for an axial distance of 0.1 to 1.0 mm. The imaging results are presented for standard samples such as onion and Scotch tape.
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MEDLINE
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En
Ano de publicação:
2023
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Article