Dual-beam laser autofocusing system based on liquid lens

Zhang, Fumin; Yao, Yannan; Qu, Xinghua; Zhang, Tong; Pei, B

doi:10.1016/j.optlastec.2016.09.014

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…While liquid lenses can avoid astigmatism by using several electrodes, in particular, spherical aberration is challenging for example in dual beam auto focussing systems, 11 even without switching the focal length. In membrane based LLs, the thickness of the membrane can be varied to minimize aberrations.…”

Section: Study Of Surface Modes On a Vibrating Electrowetting Liquid mentioning

confidence: 99%

Study of surface modes on a vibrating electrowetting liquid lens

Strauch

Shao

Bociort

et al. 2017

Applied Physics Letters

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The increased usage of liquid lenses motivates us to investigate surface waves on the liquid's surface. During fast focal switching, the surface waves decrease the imaging quality. We propose a model that describes the surface modes appearing on a liquid lens and predicts the resonance frequencies. The effects of those surface modes on a laser beam are simulated using Fresnel propagation, and the model is verified experimentally.

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Section: Study Of Surface Modes On a Vibrating Electrowetting Liquid mentioning

confidence: 99%

Study of surface modes on a vibrating electrowetting liquid lens

Strauch

Shao

Bociort

et al. 2017

Applied Physics Letters

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“…Zhang et al . () designed a dual‐beam laser autofocusing system based on a liquid lens with less moving parts and fast response time, which makes the system simple, reliable, compact and fast. Jabbour et al .…”

Section: Related Workmentioning

confidence: 99%

“…Rodrigo & Alieva (2014) implemented an electrically tunable lens for partially coherent light microscopy, which allows for a more rapid response and high-speed measurement. Zhang et al (2017) designed a dual-beam laser autofocusing system based on a liquid lens with less moving parts and fast response time, which makes the system simple, reliable, compact and fast. Jabbour et al (2014) used a liquid lens in confocal microscopy for Z-axial scanning.…”

Section: Liquid Lens For Axial Scanning Applications In Microscopementioning

confidence: 99%

Nonmechanical and multiview 3D measurement microscope for workpiece with large slope and complex geometry

Zhang

2018

Journal of Microscopy

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“…One way to retrieve the focus quickly after position detection is to incorporate axial varifocal optics 27 , such as deformable mirrors 24,28 , electrical tunable lenses 29 or liquid crystal devices [30][31][32] , manipulating the focal position and bypassing delays in acceleration/deceleration from any mechanical motion. However, the response rate of the above varifocal optics is limited to 1 kHz.…”

Section: Introductionmentioning

confidence: 99%

Single-lens dynamic $$z$$-scanning for simultaneous in situ position detection and laser processing focus control

Du,

Florian,

Arnold

2023

Light Sci Appl

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Existing auto-focusing methods in laser processing typically include two independent modules, one for surface detection and another for $$z$$ z -axis adjustment. The latter is mostly implemented by mechanical $$z$$ z stage motion, which is up to three orders of magnitude slower than the lateral processing speed. To alleviate this processing bottleneck, we developed a single-lens approach, using only one high-speed $$z$$ z -scanning optical element, to accomplish both in situ surface detection and focus control quasi-simultaneously in a dual-beam setup. The probing beam scans the surface along the $$z$$ z -axis continuously, and its reflection is detected by a set of confocal optics. Based on the temporal response of the detected signal, we have developed and experimentally demonstrated a dynamic surface detection method at 140–350 kHz, with a controlled detection range, high repeatability, and minimum linearity error of 1.10%. Sequentially, by synchronizing at a corresponding oscillation phase of the $$z$$ z -scanning lens, the fabrication beam is directed to the probed $$z$$ z position for precise focus alignment. Overall, our approach provides instantaneous surface tracking by collecting position information and executing focal control both at 140–350 kHz, which significantly accelerates the axial alignment process and offers great potential for enhancing the speed of advanced manufacturing processes in three-dimensional space.

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Dual-beam laser autofocusing system based on liquid lens

Cited by 10 publications

References 16 publications

Study of surface modes on a vibrating electrowetting liquid lens

Study of surface modes on a vibrating electrowetting liquid lens

Nonmechanical and multiview 3D measurement microscope for workpiece with large slope and complex geometry

Single-lens dynamic $$z$$-scanning for simultaneous in situ position detection and laser processing focus control

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