Mr. Mingyu Lee Profile

Mingyu Lee

at Yonsei Univ

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Proceedings Article | 7 March 2022 Presentation

All-fiber large-diameter Bessel-like beam generator with suppressed photothermal effect in an aqueous environment

Hyeonwoo Lee, Mingyu Lee, Juwon Yoon, Hyeung Joo Lee, Kyunghwan Oh

Proceedings Volume 11953, (2022) https://doi.org/10.1117/12.2608631

KEYWORDS: Photothermal effect, Single mode fibers, Silica, Photonic devices, Optical tweezers, Optical fibers, Gaussian beams, Fiber optics, Cladding, Bessel functions

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We study the Bessel-like beam generator (BBG) exploiting a large-diameter fiber optic platform. The Bessel-like beam is the laser with a specific intensity profile similar to the square of zeroth-order Bessel function, [J₀(x)]² , and has a nondiffractive property. This device is based on the φ=200 microns coreless silica fiber (CSF), which has a larger dimension than generally used optical fiber with 125 microns cladding diameter. As a Gaussian beam from single-mode fiber (SMF) propagates along with this large-diameter CSF, it was successfully converted into a Bessel-like beam serving more lobes than the other all-fiber BBG previously reported. A large number of the lobes can provide a longer nondiffractive length of the Bessel-like beam but, more optical power is required as the beam area gets larger, generating undesirable laser-induced heating in H₂O. To solve this problem, we used an 852nm laser which is the wavelength with a small absorption coefficient of water. This enables to reduce of the photothermal effect in the aqueous application of this all-fiber BBG. In this paper, the fabrication of the all-fiber large-diameter BBG and its principle are presented. The photothermal generation in water by the BBG is numerically analyzed for two different wavelengths, 852nm, and 976nm. Furthermore, this photonic device is utilized as an optical tweezer in H₂O, discovering its feasibility for an aqueous environment.

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