High-energy 2  µm pulsed vortex beam excitation from a Q-switched Tm:LuYAG laser

Chen, Ying; Ding, Manman; Wang, Jianlei; Wang, Li; Liu, Qiyao; Zhao, Yongguang; Ying, Lei; Shen, Deyuan; Wang, Zhengping; Xu, Xin­guang; Petrov, V. V.

doi:10.1364/ol.384201

Cited by 16 publications

(6 citation statements)

References 22 publications

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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%

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…Acousto-optic (A-O) Q-switching could achieve remarkably low repetition frequencies and high single-pulse energy, but it added complexity to the laser system. Furthermore, the work in reference [ 46 ] just reported the LG 0,1 mode. Research on passive Q-switching, based on 2D material saturable absorbers (SA) and a SQS in a 2 μm regime, was mainly focused on the TEM 00 mode.…”

Section: Discussionmentioning

confidence: 99%

Pulsed Optical Vortex Array Generation in a Self-Q-Switched Tm:YALO3 Laser

Tong,

Chen,

Cai

et al. 2024

Materials

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Optical vortex arrays are characterized by specific orbital angular momentums, and they have important applications in optical trapping and manipulation, optical communications, secure communications, and high-security information processing. Despite widespread research on optical vortex arrays, the 2 μm wavelength range remains underexplored. Pulsed lasers at 2 μm are vital in laser medicine, sensing, communications, and nonlinear optic applications. The need for 2 μm-pulsed structured optical vortices, combining the advantages of this wavelength range and optical vortex arrays, is evident. Therefore, using just three elements in the cavity, we demonstrate a compact self-Q-switched Tm:YALO3 vortex laser by utilizing the self-modulation effect of a laser crystal and a defect spot mirror. By tuning the position of the defect spot and the output coupler, the resonator delivers optical vortex arrays with phase singularities ranging from 1 to 4. The narrowest pulse widths of the TEM00 LG0,−1, two-, three-, and four-vortex arrays are 543, 1266, 1281, 2379, and 1615 ns, respectively. All the vortex arrays in our study have relatively high-power outputs, slope efficiencies, and single-pulse energies. This work paves the way for a 2 μm-pulsed structured light source that has potential applications in optical trapping and manipulation, free-space optical communications, and laser medicine.

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“…[ 15,31 ] Figure shows the progression in the development of high‐power scalar vortex lasers with different OAM states. [ 24–26,29,41–61 ] Most current studies have focused on the lowest‐order OAM state, which shows an evident inverse relationship between the power level and the topological charge of l . This study, in which we achieved the highest power level to date for both low‐ and high‐order states, advances the research on scalar vortex lasers in terms of reaching new power levels.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Comparison of the proposed laser with existing scalar vortex laser sources with different OAM states. [ 24,26,29,41–61 ] Data shown pertain to typical high‐power scalar vortex lasers, for which the power level has an inverse relationship with the azimuthal mode index ( l ), i.e., there is a strongtrade–off between the output power and OAM states.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

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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High-energy 2 µm pulsed vortex beam excitation from a Q-switched Tm:LuYAG laser

Cited by 16 publications

References 22 publications

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

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

Pulsed Optical Vortex Array Generation in a Self-Q-Switched Tm:YALO3 Laser

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

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