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Dependence of Beam ...
Dependence of Beam Quality on Optical Intensity Asymmetry in In-Phase Coherently Coupled VCSEL Array
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- Pan, G. Z. (författare)
- Beijing University of Technology
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- Xie, Yiyang (författare)
- Beijing University of Technology
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- Xu, Chen (författare)
- Beijing University of Technology
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- Xun, M. (författare)
- Beijing University of Technology
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- Dong, Y. B. (författare)
- Beijing University of Technology
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- Deng, Jun (författare)
- Beijing University of Technology
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- Chen, Hongda (författare)
- Chinese Academy of Sciences
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- Sun, Jie, 1977 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Beijing University of Technology
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: IEEE Journal of Quantum Electronics. - 0018-9197 .- 1558-1713. ; 54:3
- Relaterad länk:
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https://research.cha...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Dependence of beam quality on optical intensity asymmetry among elements in in-phase coherently coupled vertical cavity surface emitting lasers array is analyzed using the finite-difference time domain solutions software. The analysis results reveal that the coupling efficiency of in-phased array decreases and the divergence increases as the level of optical intensity asymmetry increases. Furthermore, an addressable separated-contact three-element triangular in-phased array is fabricated and measured to verify the analysis. The array exhibits a relatively high of coupling efficiency of 24% and a near-diffraction-limit divergence of 3.2° (1.12 times of the diffraction limit, D.L.) when the optical intensity of each element is adjusted to be uniform. By degrading the optical intensity symmetry, the coupling efficiency decreases to 17.07% and the divergence increases to 4.03° ( 1.37× D.L.). After that, a much larger 10× 10 array exhibiting in-phase characteristics is produced and its beam quality and optical uniformity are measured and discussed. Analysis and experiment results demonstrate that symmetric optical intensity among elements is essential for in-phased array to achieve high beam quality. Employing separate contacts in the array is proved an effective way to obtain uniform optical intensity and achieve high beam quality.
Ämnesord
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- in-phase
- coupling efficiency
- beam divergence
- VCSEL array
- optical intensity asymmetry
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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