Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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25 Mar 2022
TL;DR: In this article , optical drill beams are presented as the spatiotemporal interference of two Bessel-vortex beams of different topological charges and different carrier frequencies, and the rotation in time is achieved by changing the offset of the hologram on the spatial light modulator.
Abstract: Structured light is one of the frontiers of modern photonics. It refers to the generation of customized optical fields based on wave-front shaping methods. It is a topic of intense research activity due to the wide range of applications in imaging, nonlinear optics, biophotonics 1. We propose, theoretically explore, and experimentally demonstrate “optical drill” beams presenting nonstationary intensity distributions that resemble the spinning mechanical drill. Optical drills appear as the spatiotemporal interference of two Bessel-vortex beams of different topological charges and different carrier frequencies. By mixing a pair of high-order Bessel beams, synthesized using a liquid crystal spatial light modulator, optical drills of tuned helicities were experimentally observed, and the simplest cases of light matter interaction (fluorescence) with such beams were demonstrated. The rotation in time was achieved by changing the offset of the hologram on the spatial light modulator. Optical drill beams could open new and revolutionary perspectives in dynamical material processing by light or in cell and particle manipulation in biomedical applications.
4 citations
TL;DR: In this paper, the authors presented a technique to generate Bessel beams with a tunable axial intensity within the accessible range of spatial frequencies, where the beam may be engineered to have a constant intensity along its propagation length.
Abstract: Due to their immunity to diffraction, Bessel light modes potentially offer advantages in various applications.
However, the Bessel beams generated by traditional approaches do exhibit significant intensity variations along
their axial propagation length which hampers their applicability. In this paper we present a technique to generate
Bessel beams with a tunable axial intensity within the accessible range of spatial frequencies. The beam may be
engineered to have a constant intensity along its propagation length.
4 citations
Patent•
16 Sep 2015
TL;DR: In this article, an adjustable Bessel beam generating device and the design method of a high-end ring Dammam grating thereof are described, which can be widely used for large depth imaging, laser particle capturing, a self-focusing servo system and other occasions.
Abstract: The invention discloses an adjustable Bessel beam generating device and the design method of a high-end ring Dammam grating thereof. The adjustable Bessel beam generating device orderly comprises an optical fiber coupling output laser, a coupling output optical fiber, an optical fiber coupling output mirror, a collimator lens, the high-end ring Dammam grating, a first lens, an annular amplitude filter sheet, a circular turntable and a second lens 9. The annular amplitude filter sheet is arranged on the circular turntable. The circular turntable can freely rotate about the central axis. According to the invention, the lateral resolution and the axial focus depth of a generated Bessel beam can be adjusted to some extent, and the adjustable Bessel beam generating device can be widely used for large depth imaging, laser particle capturing, a self-focusing servo system and other occasions.
4 citations
25 Nov 2014
TL;DR: In this paper, the stability of vortex Bessel beams formed in turbulent atmosphere is theoretically considered and characteristics of spatial structure of distribution of mean intensity of vortex bessel beams in an inhomogeneous medium are analyzed in detail.
Abstract: The question of stability of the vortex Bessel beams formed in turbulent atmosphere is theoretically considered. In the given research, characteristics of spatial structure of distribution of mean intensity of vortex Bessel beams in an inhomogeneous medium are analyzed in detail. The quantitative criterion of possibility of formation of vortex Bessel beams in turbulent atmosphere is derived. On the basis of the analysis of behavior of several physical parameters of mean intensity of optical radiation it is shown that the stability of the form of a vortex Bessel beam during propagation in turbulent atmosphere increases with an increase of the value of a topological charge of this beam.
4 citations
Patent•
18 Jun 2014
TL;DR: In this article, a method for cutting a substrate which includes a Bessel beam forming step, a radiation step, and a transferring step is described, in which a laser beam having Gaussian energy distribution is formed into a substrate having a length of no less than the thickness of the substrate to be cut and a spot size of no greater than 10 [mu]m.
Abstract: The present invention relates to a method for cutting a substrate which includes a Bessel beam forming step, a radiation step, and a transferring step. In the Bessel beam forming step, a laser beam having Gaussian energy distribution is formed into Bessel beam having a length of no less than the thickness of the substrate to be cut and a spot size of no greater than 10 [mu]m. In the radiation step, Bessel beam is radiated on the substrate to place the substrate within the extent of length of the Bessel beam. In the transferring step, the substrate or Bessel beam is horizontally transferred along the cutting line of the substrate.
4 citations