Affiliation:
1. Academy of Scientific and Innovative Research (AcSIR)
2. CSIR—Central Scientific Instruments Organisation
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
∼
20
%
of the QBB power. With silver coating
around the axicon, the CS power has been increased by
∼
45
%
. The QBB possesses a large depth of
field,
∼
400
µ
m
, 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
∼
2.5
to
∼
16
µ
m
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.
Funder
Science and Engineering Research Board
University Grants Commission
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering