Holograms were recorded by 30 fs laser pulses in 20 microm film of dichromated gelatin on the polished quartz substrate and reconstructed in the waveguide mode. The geometric-optical regime of waveguide hologram reconstruction was obtained: the direction of the reconstructed beam was observed to be independent on the reconstructing wavelength within the hologram spectral selectivity band. We discuss the possibility of producing achromatic waveguide optical elements containing only a few periods.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/ol.33.002401 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
An achromatic extended depth-of-field (EDOF) system can obtain clear scene information that is crucial for target recognition, dynamic monitoring, and other applications. However, the imaging performance of most optical systems is depth-variant and wavelength-variant, which leads to the generation of chromatic aberrations. Traditional optical design and image post-processing algorithms cannot effectively eliminate these chromatic aberrations.
View Article and Find Full Text PDFAchromatic Full Stokes Polarimetry Metasurface for Full-Color Polarization Imaging in the Visible Range.
Nano Lett
October 2024
National Research Center for High-Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China.
Article Synopsis
- - Metasurfaces enable compact and real-time polarimetry, but their narrow bandwidth limits use in polychromatic scenes, leading to loss of spectral information.
- - This study presents an achromatic polarimeter using four polarization-dependent metalenses, which achieves broad wavelength coverage from 450 to 650 nm with a relative bandwidth of about 0.364 for Stokes imaging.
- - The design significantly outperformed current technologies, showing lower reconstruction errors and validating its full-color, full-polarization capabilities with a customized object, enhancing practical applications in polarization imaging.
Article Synopsis
- A new method for recording dual-wavelength holograms is proposed, using a combination of LED and laser illumination to avoid customized optical elements.
- The approach involves parallel phase-shifting to minimize noise and capture clear LED holograms, alongside simultaneous laser hologram recording through spatial multiplexing.
- Experimental results show this method can effectively achieve accurate height measurements in a single shot, while ensuring low noise and a comprehensive field of view.
Chromatic Aberration Correction in Harmonic Diffractive Lenses Based on Compressed Sensing Encoding Imaging.
Sensors (Basel)
April 2024
The Center of Advanced Optical Manufacturing, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.
Large-aperture, lightweight, and high-resolution imaging are hallmarks of major optical systems. To eliminate aberrations, traditional systems are often bulky and complex, whereas the small volume and light weight of diffractive lenses position them as potential substitutes. However, their inherent diffraction mechanism leads to severe dispersion, which limits their application in wide spectral bands.
View Article and Find Full Text PDFEmpirical tests of the effectiveness of EnChroma multi-notch filters for enhancing color vision in deuteranomaly.
Vision Res
May 2024
Sussex Vision Lab, School of Psychology, University of Sussex, Falmer, UK. Electronic address:
Manufacturers of notch filter-based aids for color vision claim that their products can enhance color perception for people with anomalous trichromacy, a form of color vision deficiency (CVD). Anecdotal reports imply that people with CVD can have radically enhanced color vision when using the filters. However, existing empirical research largely focussed on the effect of notch filters on performance on diagnostic tests for CVD has not found that they have any substantial effect.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!