High power, ultrashort pulse control through a multi-core fiber for ablation

Author(s):

Donald B. Conkey and Eirini Kakkava and Thomas Lanvin and Damien Loterie and Nicolino Stasio and Edgar Morales-Delgado and Christophe Moser and Demetri Psaltis

Abstract:

“Ultrashort pulse ablation has become a useful tool for micromachining and biomedical surgical applications. Implementation of ultrashort pulse ablation in confined spaces has been limited by endoscopic delivery and focusing of a high peak power pulse. Here we demonstrate ultrashort pulse ablation through a thin multi-core fiber (MCF) using wavefront shaping, which allows for focusing and scanning the pulse without requiring distal end optics and enables a smaller ablation tool. The intensity necessary for ablation is significantly higher than for multiphoton imaging. We show that the ultimate limitations of the MCF based ablation are the nonlinear effects induced by the pulse in the MCFs cores. We characterize and compare the performance of two devices utilizing a different number of cores and demonstrate ultrashort pulse ablation on a thin film of gold.”

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Publication: Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 10, pp. 11491-11502 (2017)

DOI: 10.1364/OE.25.011491

 

High efficiency fabrication of complex microtube arrays by scanning focused femtosecond laser Bessel beam for trapping/releasing biological cells

Author(s):

Liang Yang and Shengyun Ji and Kenan Xie and Wenqiang Du and Bingjie Liu and Yanlei Hu and Jiawen Li and Gang Zhao and Dong Wu and Wenhao Huang and Suling Liu and Hongyuan Jiang and Jiaru Chu

Abstract:

“In this paper, we present a focused femtosecond laser Bessel beam scanning technique for the rapid fabrication of large-area 3D complex microtube arrays. The femtosecond laser beam is converted into several Bessel beams by two-dimensional phase modulation using a spatial light modulator. By scanning the focused Bessel beam along a designed route, microtubes with variable size and flexible geometry are rapidly fabricated by two-photon polymerization. The fabrication time is reduced by two orders of magnitude in comparison with conventional point-to-point scanning. Moreover, we construct an effective microoperating system for single cell manipulation using microtube arrays, and demonstrate its use in the capture, transfer, and release of embryonic fibroblast mouse cells as well as human breast cancer cells. The new fabrication strategy provides a novel method for the rapid fabrication of functional devices using a flexibly tailored laser beam.”

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Publication: Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 7, pp. 8144-8157 (2017)

DOI: 10.1364/OE.25.008144

 

In situ single-atom array synthesis using dynamic holographic optical tweezers.

Author(s):

Kim, Hyosub and Lee, Woojun and Lee, Han-gyeol and Jo, Hanlae and Song, Yunheung and Ahn, Jaewook

Abstract:

“Establishing a reliable method to form scalable neutral-atom platforms is an essential cornerstone for quantum computation, quantum simulation and quantum many-body physics. Here we demonstrate a real-time transport of single atoms using holographic microtraps controlled by a liquid-crystal spatial light modulator. For this, an analytical design approach to flicker-free microtrap movement is devised and cold rubidium atoms are simultaneously rearranged with 2N motional degrees of freedom, representing unprecedented space controllability. We also accomplish an in situ feedback control for single-atom rearrangements with the high success rate of 99% for up to 10?µm translation. We hope this proof-of-principle demonstration of high-fidelity atom-array preparations will be useful for deterministic loading of N single atoms, especially on arbitrary lattice locations, and also for real-time qubit shuttling in high-dimensional quantum computing architectures.”

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Publication: Nature Communications

Issue/Year/DOI: Nature Communications volume 7, Article number: 13317 (2016)
DOI: 10.1038/ncomms13317

Methods of Single-Channel Digital Holography for Three-Dimensional Imaging

Author(s):

R. Kelner and J. Rosen

Abstract:

“Digital holography is an effective tool for imaging three-dimensional (3-D) scenes or objects. In this paper, recently developed methods of single channel digital holography are reviewed: the joint object reference digital interferometer (JORDI), Fresnel incoherent correlation holography (FINCH), and Fourier incoherent single channel holography (FISCH).”

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Publication: IEEE Transactions on Industrial Informatics

Issue/Year/DOI: IEEE Transactions on Industrial Informatics ( Volume: 12, Issue: 1, Feb. 2016 )
DOI: 10.1109/TII.2015.2475247

Direct measurement of a 27-dimensional orbital-angular-momentum state vector

Author(s):

Malik, Mehul and Mirhosseini, Mohammad and Lavery, Martin P. J. and Leach, Jonathan and Padgett, Miles J. and Boyd, Robert W.

Abstract:

“The measurement of a quantum state poses a unique challenge for experimentalists. Recently, the technique of ‘direct measurement’ was proposed for characterizing a quantum state in situ through sequential weak and strong measurements. While this method has been used for measuring polarization states, its real potential lies in the measurement of states with a large dimensionality. Here we show the practical direct measurement of a high-dimensional state vector in the discrete basis of orbital angular momentum. Through weak measurements of orbital angular momentum and strong measurements of angular position, we measure the complex probability amplitudes of a pure state with a dimensionality, d=27. Further, we use our method to directly observe the relationship between rotations of a state vector and the relative phase between its orbital-angular-momentum components. Our technique has important applications in high-dimensional classical and quantum information systems and can be extended to characterize other types of large quantum states.”

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Publication: Nature Communications

Issue/Year/DOI: Nature Communications volume 5, Article number: 3115 (2014)
DOI: 10.1038/ncomms4115

Far-field imaging of non-fluorescent species with subdiffraction resolution

Author(s):

Wang, Pu, and Mikhail N. Slipchenko, and James Mitchell, and Chen Yang, and Eric O. Potma, and Xianfan Xu, and Ji-Xin Cheng

Abstract:

“Super-resolution optical microscopy is providing a new means by which to view as yet unseen details on a nanoscopic scale. Current far-field super-resolution techniques rely on fluorescence as the readout1–5.
Here, we demonstrate a scheme for breaking the diffraction limit in far-field imaging of nonfluorescent species by using spatially controlled saturation of electronic absorption. Our method is based on a pump–probe process where a modulated pump field perturbs the charge carrier density in a sample, thus modulating the transmission of a probe field. A doughnut-shaped laser beam is then added to transiently saturate the electronic transition in the periphery of the focal volume, so the induced modulation in the sequential probe pulse only occurs at the focal centre. By raster-scanning the three collinearly aligned beams, high-speed subdiffractionlimitedimaging of graphite nanoplatelets is performed. This technique has the potential to enable super-resolution imaging of nanomaterials and non-fluorescent chromophores, which may remain out of reach to fluorescence-based methods.”

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Publication: NATURE PHOTONICS ADVANCE ONLINE PUBLICATION

Issue/Year/DOI: Nature Photonics volume 7, pages 449–453 (2013)
DOI: 10.1038/NPHOTON.2013.97