Low-loss and helical-phase-dependent selective excitation of high-order orbital angular momentum modes in a twisted ring-core fiber

Wu, Yan; Wen, Jianxiang; Zhang, Mengdi; Cao, Ying; Chen, Wei; Zhang, Xiaobei; Yusufu, Taximaiti; Pang, Fufei

doi:10.1364/ol.468259

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…There are many methods that belong to the wave-guide based ones, including fiber Bragg gratings [13], photonic crystal fibers [14], chiral fiber gratings [15], hollow-core antiresonant fiber [16,17], and ring core fibers [18,19]. Compared to spatial-light-based methods, the optical-fiber based methods do not require other optical elements and also have the advantages of flexibility, better compatibility with optical communication links and efficiency for OAM mode generation [14,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Orbital angular momentum modes in dielectrically chiral-core fibers

Dirbeba,

Li,

Cao

et al. 2024

J. Phys. D: Appl. Phys.

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In this paper, we investigate a dielectrically chiral-core fiber for the generation of orbital angular momentum (OAM) modes. We observe that the presence of chirality induces a modal index split between the same order OAM modes with opposite topological charges and arbitrary phase front rotation directions, which are originally degenerate in achiral fibers. This split indicates the existence of circular birefringence (CB) associated with a dielectric chirality. The modal cutoff splits result in a single polarization property without the possibility of coupling between the same order modes that correspond to a single +l or -l OAM mode guiding. However, neither of the two fundamental modes guided in the chiral fiber exhibits a cutoff, despite having different modal indices due to chirality. Upon fraction of modal power cutoff, the high-order modes in the core region display different cutoff fractions of modal power between the same order modes, while the fundamental mode has no cutoff fraction of modal power. Owing to the CB and different fractions of modal power in the core for different handed OAM modes, dielectrically chiral fibers have potential applications in chiral sensing, circular polarization-dependent OAM mode filters, and new kind of OAM mode generators.

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Section: Introductionmentioning

confidence: 99%

“…It should be pointed out that structural chirality and achiral fibers have been commonly used to generate OAM modes [19,[25][26][27]. Even though the concept of dielectrically chiral fibers seems like an old topic, the idea of generating OAM modes in such kinds of fibers is still not investigated.…”

Section: Introductionmentioning

confidence: 99%

Orbital angular momentum modes in dielectrically chiral-core fibers

Dirbeba,

Li,

Cao

et al. 2024

J. Phys. D: Appl. Phys.

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“…Moreover, high-order transverse-mode lasers hold vast potential applications in various domains such as optical fiber tweezers [5], high-resolution imaging [6,7], high-dimensional quantum entanglement [8], and optical micromachining [9,10]. Consequently, the controllable excitation of high-order transversemode lasers in an all-fiber system has become a focal point of research in recent years [11,12]. However, there is still no mature optical fiber device that allows fiber laser systems to stably generate high-order transverse-mode lasers.…”

Section: Introductionmentioning

confidence: 99%

Design of Self-Matching Photonic Lantern for High-Order Transverse-Mode Laser Systems

Zhao,

Li,

Chen

et al. 2024

Photonics

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High-order transverse-mode lasers have important potential application value in many fields. To address the current issue of the limited controllability of modes in high-order transverse-mode lasers, we have designed a self-matching photonic lantern (SMPL). The SMPL is formed by introducing a few-mode fiber into the input fiber array of the traditional photonic lantern. The parameters of the few-mode fiber match those of the tapered few-mode port of the SMPL; thus, it can transmit high-order modes in a closed loop. The designed SMPL exhibits dual-band multiplexing characteristics at 980/1550 nm, manifesting specifically as high-order mode selectivity excitation at 980 nm and mode preservation at 1550 nm. These characteristics have been validated through simulation and preliminary experiments. The SMPL is designed for constructing all few-mode fiber ring cavity lasers, enabling the pumping of the 980 nm fundamental mode to high-order modes and the transmission of multiple high-order transverse-mode lasers at 1550 nm in a closed loop. The proposed SMPL extends the configuration and functionality of the photonic lantern family, offering a flexible and effective approach to facilitate the generation of multiple high-order transverse-mode lasers. The SMPL combined with fiber laser systems could effectively broaden communication channels and enhance communication bandwidth. It also holds significant value in optical sensing, high-resolution imaging, laser micro-processing, and other fields.

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“…The unique characteristics of OAM and how it can be imparted to physical media have led to significant interest in vortex beams and, more generally, their methods of generation and application. In recent years, numerous methods have been used for the generation of vortex beams using devices, such as spiral phase plates (SPP) [2], Q-plates [3], fiber lasers [4][5][6], spatial light modulators (SLM) [7], and digital micromirror devices (DMD) [8]. These have been used to generate vortex beams, including integer-order vortex beams [9,10], fractional-order vortex beams [11,12], elliptical vortex beams [13,14], and so-called "perfect vortex beams" [15,16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Verification of Off-Axis Double Vortex Beams

Ye,

Zhou,

Aierken

et al. 2024

Photonics

Self Cite

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Vortex beams are unique in that they have annular spatial profiles and carry orbital angular momentum. This has led to their use in applications including laser processing, microparticle manipulation and signal transmission. Off-axis vortex beams, which may be considered a subset of vortex beams, display a broader spectrum of physical characteristics in comparison with their conventional (integer-order) counterparts. In this work, we derive the equations which describe the intensity distribution of off-axis vortex beams and use these to theoretically model their spatial profile. These models are supported by experimental generation of both integer and off-axis vortex beams, and the presence of orbital angular momentum is investigated through the use of the cylindrical lens transformation method.

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Low-loss and helical-phase-dependent selective excitation of high-order orbital angular momentum modes in a twisted ring-core fiber

Cited by 15 publications

References 20 publications

Orbital angular momentum modes in dielectrically chiral-core fibers

Orbital angular momentum modes in dielectrically chiral-core fibers

Design of Self-Matching Photonic Lantern for High-Order Transverse-Mode Laser Systems

Numerical Analysis and Verification of Off-Axis Double Vortex Beams

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