Generating Controllable Laguerre-Gaussian Laser Modes Through Intracavity Spin-Orbital Angular Momentum Conversion of Light

Wei, Dunzhao; Cheng, Yueming; Ni, Rui; Zhang, Yong; Hu, Xiaopeng; Zhu, Shining; Xiao, Min

doi:10.1103/physrevapplied.11.014038

Cited by 56 publications

(25 citation statements)

References 57 publications

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“…3 shows the intensity profiles of the pump and idler beams without any polarization projection. As in previous reports 15,33 , one can measure the purity of the OAM mode of the vector- vortex beam through the mode projection technique 1,34,35 . However, due to a lack of suitable spatial light modulator (SLM) in our laboratory, we were not able to perform the mode purity measurement for the vector- vortex beams.…”

Section: Resultsmentioning

confidence: 97%

Tunable vector-vortex beam optical parametric oscillator

Sharma

Kumar

Aadhi

et al. 2019

Sci Rep

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Vector-vortex beams, having both phase and polarization singularities, are of great interest for a variety of applications. Generally, such beams are produced through systematic control of phase and polarization of the laser beam, typically external to the source. However, efforts have been made to generate vector-vortex beams directly from the laser source. Given the operation of the laser at discrete wavelengths, vector-vortices are generated with limited or no wavelength tunability. Here, we report an experimental scheme for the direct generation of vector-vortex beams. Exploiting the orbital angular momentum conservation and the broad wavelength versatility of an optical parametric oscillator, we systematically control the polarization of the resonant beam using a pair of intracavity quarter-wave plates to generate coherent vector-vortex beam tunable across 964–990 nm, with output states represented on the higher-order Poincaré sphere. The generic experimental scheme paves the way for new sources of structured beams in any wavelength range across the optical spectrum and in all time-scales from continuous-wave to ultrafast regime.

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Section: Resultsmentioning

confidence: 97%

Tunable vector-vortex beam optical parametric oscillator

Sharma

Kumar

Aadhi

et al. 2019

Sci Rep

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“…For a radially symmetric system with u(R) = 0 , q n is minimised by an annular source Q(r, t). Such annular sources have been realised (with near ideal efficiency) in a number of ways: as helical lasing modes achieved with two spiral phase plates [90,91] and their vector equivalents with wave-plates [92]; as radially polarized lasing modes achieved with double axicon cavities [93] and as pump profiles [41][42][43][44][45]. Here, we implement an annular source as an LG beam (Fig.…”

Section: Reducing Thermal Effects With Structured Lightmentioning

confidence: 99%

Thermal aberrations and structured light I: analytical model for structured pumps and probes

Scholes

Forbes

2021

Appl. Phys. B

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Structured light, where optical beams are tailored in amplitude, phase and polarisation to some desired profile, has become topical of late, fuelled by the ease at which such fields can be created internal and external to the source. In this treatise, part I of a two part series, we consider the thermal effects (stress, lensing and phase aberrations) associated with high-power structured light, where the structure may be the pump, optically inducing the thermal effects in the medium, or the probe, experiencing thermally induced optical aberrations. We outline a general theory for arbitrary structured light pumps and probes, reducing to the prior studies of Gaussian and flat-top beams as special cases. We illustrate the power of the model using the structure of light as a new degree of freedom with which to mitigate thermally induced optical aberrations. Finally, in part II of this composite work (Scholes and Forbes, Appl Phys B, 2021.

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“…Since OAM carried by LG mode has nothing to do with the mode order number in the radial direction (ρ) [22,23], we can only consider only the mode of ρ = 0 case for the sake of simplicity. With Equation 5LG and HG modes can be related and some examples for l = 1, 2, 3, and 4 are given as follows:…”

Section: Decomposition Of Higher-order Oam Modesmentioning

confidence: 99%

On-Chip Guiding of Higher-Order Orbital Angular Momentum Modes

Lee

Kim

2019

Photonics

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Higher-order orbital angular momentum (OAM) mode guiding in a waveguide which is suitable for on-chip integration has been investigated. Based on the relation between the Laguerre-Gaussian mode and the Hermite-Gaussian mode, it has been shown that two degenerate guided modes of π/2l-rotation symmetry can support the l-th order OAM mode. In order to mimic the rotational symmetry, we have proposed the waveguide structure of a cross-shaped core and designed a waveguide that can support OAM modes of ±1 and ±2 topological charges simultaneously at a wavelength of 1550 nm. Purity of the OAM modes guided in the designed waveguide has been assessed by numerically calculating their topological charges from the field distribution, which were close to the theoretical values. We also investigated the guiding of OAM modes of ±3 and ±4 topological charges in our proposed waveguide structure, which revealed the possibility of the separate guiding of those OAM modes with relatively lower purity.

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Generating Controllable Laguerre-Gaussian Laser Modes Through Intracavity Spin-Orbital Angular Momentum Conversion of Light

Cited by 56 publications

References 57 publications

Tunable vector-vortex beam optical parametric oscillator

Tunable vector-vortex beam optical parametric oscillator

Thermal aberrations and structured light I: analytical model for structured pumps and probes

On-Chip Guiding of Higher-Order Orbital Angular Momentum Modes

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