Chain of optical vortices synthesized by a Gaussian beam and the double-phase-ramp converter

Author(s):

Anna Khoroshun, Oleksii Chernykh, Halyna Tatarchenko, Shunichi Sato, Yuichi Kozawa, Agnieszka Popiołek-Masajada, Mateusz Szatkowski, and Weronika Lamperskan

Abstract:

“A full theoretical and experimental analysis of the chain of phase singularities generated when a Gaussian beam passes a double-phase-ramp converter is presented. The overall output beam structure includes a system of interrelated optical vortices (OVs) whose trajectories form a three-dimensional singular skeleton that can be applied for the trapping and guiding of microparticles. The internal structure of each individual phase singularity is characterized by the OV topological charge and by the morphology parameters of equal intensity ellipses in the OV-core area: ellipticity (minor-to-major axes ratio) and the inclination angle. The morphology parameters’ evolution is shown to be valuable for the metrology applications.”

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Publication: OSA Continuum
Issue/Year: Vol. 2, Issue 2, pp. 320-331 (2019)
DOI: 10.1364/OSAC.2.000320

Distribution Agreement with LASER COMPONENTS USA

Laser Components USAHOLOEYE has entered into a distribution agreement with LASER COMPONENTS USA for the distibution of our Spatial Light Modulator (SLM) products in North America as of January 01, 2019.

We believe that Laser Components USA is the right partner to increase our reachability and service in the US. The Laser Components sales and service team has a good understanding of our products and (more…)

Endogenous SHG and 2PEF coherence imaging of substructures in neurons in 3D

Author(s):

Carlos Macias-Romero, Claire Teulon, Marie Didier, and Sylvie Roke

Abstract:

“Neuronal morphology, long-distance transport and signalling critically depend on the organization of microtubules in the cytoskeleton. Second harmonic generation (SHG) imaging has been recognized as a potentially powerful tool for in situ label-free neuroimaging with specific sensitivity to microtubules. We study here the structural organization of microtubules in living neurons using a wide-field multiphoton microscope that performs 3D imaging using a structured illumination. This microscope allows label-free high throughput imaging of living mammalian neurons. We show that we can image structural correlations by taking advantage of the structured illumination and the coherence of the emitted light. The result allows us to study the microtubule organization throughout the development of the neuron and to differentiate between the regions of the cytoskeleton in the matured neuron.”

Link to Publications Page

Publication: Optics Express
Issue/Year: Vol. 27, Issue 3, pp. 2235-2247 (2019)
DOI: 10.1364/OE.27.002235

A full-color compact 3D see-through near-eye display system based on complex amplitude modulation

Author(s):

Zhang, Zhiqi; Liu, Juan; Gao, Qiankun; Duan, Xinhui & Shi, Xueliang

Abstract:

“For complex amplitude modulation (CAM)-based three-dimensional (3D) near-eye systems, it is a challenge to realize colorful 3D display by using spatial light modulator (SLM) and grating. Here, a full-color compact 3D see-through near-eye display (NED) system by CAM is proposed. Computer generated holograms (CGHs) for different wavelengths are calculated separately. Each CGH contains two position-shifted sub-holograms and the separated distance is carefully calibrated to eliminate chromatic aberration. Colorful 3D images are synthesized through time-multiplexing. Color managements are performed and chromatic aberration of the system is analyzed to provide better colorful effect. The system structure is integrated to be compact and a prototype is implemented. Pre-compensation is added on CGHs to offset the system’s assembling errors. Optical experiment results show that the proposed system can provide good 3D full-color see-through performance without vergence-accommodation conflict (VAC). Dynamic colorful display ability is also tested, which shows good potential for interactive NED in the future.”

Link to Publications Page

Publication: Optics Express
Issue/Year: Optics Express, Volume 27; Number 5; Pages 7023; 2019
DOI: 10.1364/oe.27.007023