Inner-cavity generation of mid-infrared optical vortex arrays from an Er:CaF2 laser

Niu, Zhichuan; Tong, Luyang; Xiao, Cao; Chen, Changdong; Cai, Yangjian; Zhao, Lina

doi:10.1016/j.infrared.2023.104863

Cited by 1 publication

(1 citation statement)

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“…A range of OVAs with adjustable singularities, ranging from 1 to 10, has been generated within a microchip laser system by employing a tilted annular beam as the pump source [ 20 ]. We have directly generated OVAs in all-solid-state lasers operating at wavelengths of 1 μm and 3 μm by using the off-axis pumping method and introducing defect spots within the cavity [ 35 , 36 ]. However, to date, research on OVAs in the 2 μm wavelength range has received less attention.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%