27  μm optical vortex beam directly generated from an Er:Y<sub>2</sub>O<sub>3</sub> ceramic laser

Ding, Manman; Chen, Ying; Wang, Jun; Yin, Danlei; Wang, Ying; Liu, Peng; Zhao, Yongguang; Tang, Dingyuan; Shen, Deyuan; Liu, Ying; Wang, Zhengping; Xu, Xin­guang; Petrov, Valentín

doi:10.1364/ol.44.004973

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…In comparison, the modal weighting at the highest power level (see Figure 5d,f for the corresponding amplitude and phase, respectively) was ≈93%, with only 2% originating from the p ≠ 0 modes. The high modal purity, close to a range of 90%–95%, reported for OAM lasers employing special tailoring [ 22,29 ] or operating with few longitudinal modes [ 40 ] can be attributed to the presence of the gain‐filtering‐induced clean resonant mode with suppressed radial indices in the SFOC.…”

Section: Resultsmentioning

confidence: 61%

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Zhao,

Chen,

Zheng

et al. 2024

Laser & Photonics Reviews

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The orbital angular momentum (OAM) of light, which is associated with the rotation of the phase structure, gives rise to numerous novel physical phenomena inlight–matter interactions. However, the direct generation of scalar OAM lasers with power‐handling capability and controllable states at the source remains challenging owing to mode degeneracy, handedness selection, and nonlinear thermal effects, which can even lead to topological charge splitting. This paper proposes a novel approach that allows spatial mode‐conversion‐controlled laser oscillation in a high‐gain OAM laser cavity with an integrated spiral‐face output coupler (SFOC). By adapting position‐dependent resonant modes, scalar optical vortices with a record power level (>60 W), high purity (>90%), and controllable OAM states (ħ or −8ħ) are demonstrated. Further, the dynamic process of OAM generation and evolution in the cavity is revealed. The concept presented herein opens a new route for the generation of OAM laser sources toward high power levels and holds promise for advancing classical and quantum optics, particularly in the area of light–matter interactions.

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Section: Resultsmentioning

confidence: 61%

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Zhao,

Chen,

Zheng

et al. 2024

Laser & Photonics Reviews

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“…1(a). To select the pure LG 0,1 (or LG 0,−1 ) mode, i.e., handedness control, additional asymmetric loss that was introduced by slightly misaligning the laser cavity, is necessary to reduce the frequency difference of the intracavity eigen modes, thus forming an LG mode with well-defined handedness [12,13,27,28] . For the Ekc laser, which has a lower gain as in the case of the fundamental beam, the threshold absorbed pump power for the LG 0,1 (or LG 0,−1 ) mode was 4.8 W. A slight change of the pump power or rotation of the BF will destroy the spatial structure of the optical vortex, leading to mode instability or mixing.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5(b) shows the optical spectra at different emission peaks, the spectral full width at half-maximum (FWHM) in the full range was less than 50 pm, which should be helpful for the high-purity vortex laser operation [28] . In comparison, the LG 0,−1 mode exhibited a better performance, which may be caused by the lower introduced losses for generation of such a mode.…”

Section: Resultsmentioning

confidence: 99%

Widely tunable 2 µm optical vortex from a Tm:YAP laser

et al. 2023

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In this paper, we report on a wide wavelength tuning optical vortex carrying orbital angular momentum (OAM) of ±ħ, from a thulium-doped yttrium aluminum perovskite (YAP) laser employing a birefringent filter. The OAM is experimentally found to be well maintained during the whole wavelength tuning process. The Laguerre-Gaussian (LG 0,1 ) mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and LG 0,−1 mode with a range of 76 nm from 1920.4 to 1996.6 nm, are, respectively, obtained. This is, to the best of our knowledge, the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2 μm spectral range, as well as the broadest tuning range ever reported from the vortex laser cavity. Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.

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“…The annular pump approach is based on a central-null pumping configuration, which was usually obtained through axicons [34][35][36][37], capillary fiber [38][39][40][41], or center-punched mirror [42][43][44][45][46]. In 2017, Zhang et al [47] achieved a direct LG 0,1 vortex output in a Yb:MgWO 4 laser, which manifested handedness control without additional elements.…”

Section: Vortex Beam Generationmentioning

confidence: 99%

Recent Progress in Nonlinear Frequency Conversion of Optical Vortex Lasers

Liu

Duan

et al. 2022

Front. Phys.

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Optical vortices are optical fields that possess a helical phase and orbital angular momentum, which have found the application in micromanipulation, optical communication, orbital angular momentum entanglement, super-resolution imaging, metrology, etc. The urgent need for the wide spreading applications of vortex lasers is to increase the wavelength versatility. In this study, the nonlinear frequency conversion of vortex lasers with a focus on sum frequency generation stimulated Raman scattering, and optical parametric oscillators were meticulously reviewed. The characteristics of the topological charge transfer and output beam profiles of different frequency conversion were discussed. As the precise tuning of optical fields in both temporal and spatial domains shall be the trend of future studies, it is our hope that this review shall serve as a reference for future research. Combining these techniques with the streaming methods to produce optical vortices, i.e., annular pump, off-axis pump, reflection mirror with defect spots, spherical aberration, and birefringence, it is advisable to expand the wavelength and fill the wavelength gap in the ultraviolet, visible, and infrared bands.

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27 μm optical vortex beam directly generated from an Er:Y₂O₃ ceramic laser

Cited by 16 publications

References 24 publications

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Widely tunable 2 µm optical vortex from a Tm:YAP laser

Recent Progress in Nonlinear Frequency Conversion of Optical Vortex Lasers

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27 μm optical vortex beam directly generated from an Er:Y2O3 ceramic laser

Cited by 16 publications

References 24 publications

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Controlled Generation of High‐Purity Scalar Orbital Angular Momentum States from a High‐Power Single‐Crystal Fiber Laser

Widely tunable 2 µm optical vortex from a Tm:YAP laser

Recent Progress in Nonlinear Frequency Conversion of Optical Vortex Lasers

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Product

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27 μm optical vortex beam directly generated from an Er:Y₂O₃ ceramic laser