03/14/2022: F. Akhoundi et al., “Performance analysis of a compact auto-phoropter for accessible refractive assessment of the human eye“, Appl. Opt. 61, 2207-2212 (2022). Link
In this publication, we present the performance analysis of a portable auto-phoropter capable of an objective measurement of the refractive power and astigmatism of the human eye, and presenting the correction to the patient.
01/11/2022: C. Draper and P.-A. Blanche, “Holographic curved waveguide combiner for HUD/AR with 1-D pupil expansion“, Opt. Express 30, 2503-2516 (2022). Link
In this publication, we are demonstrating for the first time ever how a curved waveguide can be used as a combiner for head up display or augmented reality applications. We used holographic optical elements to correct for the distortion of the image during its propagation inside the curved waveguide. The image is extracted from the waveguide multiple times to expand the system pupil and offer a large eye box. The image that is perceived by the viewer does not show any aberration, and is projected at infinity so it does not require any accommodation. In addition, we are using a polymer waveguide, instead of glass, which reduces dramatically the cost of the system.
This publication has been the 7th top downloaded article from Optics Express during the month of January.
12/23/2021: P. E. Alcaraz, G. Nero, and P.-A. Blanche, “Bandwidth optimization for the Advanced Volume Holographic Filter,” Opt. Express 30, 576-587 (2022). Link
We previously explained that two diffraction gratings working together can extend the spectral bandwidth of the system (link). In this new paper, we optimized the configuration to obtain the maximum bandwidth. This technique can find applications in astronomy and free space communication.
11/02/2021: Thank you to OPTICA (former OSA) for electing me as a Fellow of the Society. Link
08/24/2021: Highlighted Articles from Optics Letters, “Ultrahigh-definition volumetric light field projection“, Spotlight Summary by Pierre-Alexandre Blanche. Link
07/19/2021: I will be presenting two papers and chairing the session on Metrology and Profilometry during the OSA Imaging and Applied Optics Congress. Link
Our first paper is DW4B.3: “Texas Instruments Phase Light Modulator for Holography“. The Texas Instruments Phase Light Modulator (TI PLM) is a new type of MEMS that modulates the phase of the incoming light by moving micro-mirrors up and down. We characterized this device for beam steering and for the projection of holographic images.
Our second paper is DF2F.4: “Curved Holographic Waveguide Combiner for HUD and AR Display“. We are presenting a curve waveguide combiner with holographic optical elements that are compensating for image propagation aberration. Both ray tracing model and early experimental demonstrator are discussed.
05/26/2021: Erol Ozgur et al., “Parametric dog-bone-shaped tunable cylindrical fluidic lens“, Optics Vol. 60, Issue 16, pp. 4755-4761 (2021). Link
In this article we are demonstrating the best shape to obtain a fluid cylindrical lens, which focal distance can be adjusted without introducing aberration.
This article was selected by OSA to appear in the “Spotlight on Optics“. Link
02/12/2021: Craig T. Draper and Pierre-Alexandre Blanche, “Examining aberrations due to depth of field in holographic pupil replication waveguide systems,” Appl. Opt. 60, 1653-1659 (2021). Link
In this article we are explaining why the image is doubling when projected at at different distances in waveguide combiner, and more importantly, how to solve this problem. This has applications in HUD and augmented reality systems
02/01/2021: Juan Liu et al., “Digital Holography and 3D Imaging 2020: introduction to the feature issue“, Appl. Opt. 60, DH1-DH2 (2021). Link
The Journal of the Optical Society of America A (JOSA A) and Applied Optics (AO) have just published a Joint Feature Issue expanding on material presented at OSA’s 2020 Digital Holography and 3D Imaging Conference (DH), which was held virtually 22-26 June 2020. The articles included cover major research topics in holography, including digital holography, holographic imaging, holographic measurement, holographic display, holographic deep learning, and other novel techniques. Link
02/02/2021: Highlighted Articles from Applied Optics Journals, “Iterative multiplane hologram generation with mixed constraint“, Spotlight Summary by Pierre-Alexandre Blanche. Link