2m-distance external cavity VECSEL for wireless charging applications

Zhang, Zhuo; Zhang, Jianwei; Zhou, Yinli; Zhang, Xing; Li, Zhiwei; Zhang, Jiye; Jun, Zhang; Gong, Yuanhao; Liu, Tianjiao; Mu, Jingfei; Q, Li; Wang, Lijun

doi:10.1364/oe.457112

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…Given the intracavity beam’s small radius, minute changes in lens position significantly impact laser cavity stability. The ABCD matrix algorithm, widely employed in laser resonator design and beam propagation analysis, efficiently analyzes the propagation of ideal beams [ 24 , 25 , 26 ]. Leveraging the VECSEL’s high beam quality and small divergence angle near the diffraction limit, we developed a theoretical model based on the generalized ABCD matrix algorithm to simulate the influence of lens parameters on laser cavity stability, facilitating a more precise laser cavity design scheme.…”

Section: System Overview and Methodsmentioning

confidence: 99%

High-Efficiency Frequency Doubling Blue-Laser VECSEL Based on Intracavity Beam Control

Zhang,

et al. 2024

Sensors

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Blue lasers are integral to a variety of applications, including marine communication, underwater resource exploration, cold laser processing, laser medicine, and beyond. Vertical external cavity surface-emitting lasers (VECSELs) have the advantages of high output power and tunable wavelength, and can output blue laser via frequency doubling. In this article, a new type of intracavity beam control external-cavity structure is introduced. The laser beam waist is effectively adjusted by intracavity beam control, and the frequency conversion efficiency is improved. A laser cavity stability analysis model was developed to investigate the impact of laser cavity lens parameters and relative positions on stability. The external resonant cavity of VECSELs utilizes two optical lenses to position the beam waist near the laser output coupling mirror and locates the frequency doubling crystal at a high optical power density position to optimize frequency conversion efficiency. The VECSEL straight external-cavity structure achieves a frequency conversion efficiency of up to 60.2% at 488 nm, yielding a blue laser output exceeding 1.3 W. The full width at half maximum of the 488 nm spectrum measures approximately 0.23 nm. This intracavity beam-controlled direct external-cavity structure effectively mitigates laser mode leakage and shows potential for the development of an efficient and compact blue laser source.

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Section: System Overview and Methodsmentioning

confidence: 99%

High-Efficiency Frequency Doubling Blue-Laser VECSEL Based on Intracavity Beam Control

Zhang,

et al. 2024

Sensors

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Adaptive Wireless Power Transfer via Resonant Laser Beam Over Large Dynamic Range

Sheng

Geng

Chang

et al. 2023

IEEE Internet Things J.

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Cat-eye retroreflectors based large-dynamic-range alignment-free laser

Sheng¹,

Geng²,

Wang³

et al. 2023

Acta Phys. Sin.

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Lasers with cavities consisting of retroreflecting elements can give the potential for large-dynamic-range alignment-free operation, which makes the important applications of adaptive wireless laser power transfer/communication possible. In such an emerging approach based on resonant laser beam in the cavity, the laser is delivered to the photovoltaic cell for charging application (or photodiode for communication application) at the receiver automatically, without the necessity of positioning and aiming the receiver in conventional laser wireless power transfer techniques. The laser capable of operating alignment-free efficiently across large-dynamic-range is essential for the application. In this paper, the requirements on the dynamic range of alignment-free operation are summarized. An alignment-free laser with a cavity consisting of cat-eye retroreflectors is designed, and a large alignment-free dynamic range as never before is experimentally demonstrated. Telescope system in the laser cavity is adopted to suppress the beam expansion to enhance the working distance between the laser transmitter and the receiver. Coupled cavity scheme is used to decrease the laser intensity between the transmitter and the receiver for laser safety. By calculating the stability zone of the laser cavity, we found that the stability zone of the receiver cat-eye distance is quite narrow. Hence, the laser operation is very sensitive to the defocusing of the cat eye defocusing. Moreover, the cat eye defocusing induced by optical aberrations of spherical aberration and field curvature could be rather serious, when the long working distance results in a large beam size and the angle of incidence is large, hence limiting the effective working distance and the field of view of the alignment-free laser significantly. In the experiment, the improved optical designs with the aberrations compensated were adopted for large-dynamic-range alignment-free operation. The end-pumped Nd:GdVO<sub>4</sub> laser at 1063 nm could deliver over 5 W output within a working distance range of 1 m -5 m, and a receiver field of view of ±30°, without cavity realignment. The transmitter field of view reaching 4.6° (full width at half maximum) at a working distance of 5 m is also realized, with a corresponding receiver transverse movement range of 40 cm. Our work clarifies the optimizing criteria of the large-dynamic-range alignment-free laser based on cat-eye retroreflectors.

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2m-distance external cavity VECSEL for wireless charging applications

Cited by 3 publications

References 33 publications

High-Efficiency Frequency Doubling Blue-Laser VECSEL Based on Intracavity Beam Control

High-Efficiency Frequency Doubling Blue-Laser VECSEL Based on Intracavity Beam Control

Adaptive Wireless Power Transfer via Resonant Laser Beam Over Large Dynamic Range

Cat-eye retroreflectors based large-dynamic-range alignment-free laser

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