Propagation properties of the circular Airy beam with a Gaussian envelope in Fourier space

Author(s):

Tao Geng and Xiuxiang Zhang

Abstract:

“We theoretically and experimentally study the propagation properties of the circular
Airy beam (CAB) with a Gaussian envelope in Fourier space. The two parameters of the Gaussian
function can be used to control the distribution of the spatial frequency, and thus to tune the
propagation properties of this modified CAB. When the two parameters are chosen appropriately,
the size of focal spot will be reduced, the maximum focal intensity and especially the abruptly
autofocusing property will be greatly enhanced. Meanwhile, the focal position can remain almost
the same with the common CAB. The experimental results show that the proposed beam can
be generated conveniently by using the same Fourier transform method as used to generate the
common CAB.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Vol. 28, Issue 2, pp. 2447-2455
DOI: 10.1364/OE.384143

Wavefront-shaping-based correction of optically simulated cataracts

Author(s):

Augusto Arias and Pablo Artal

Abstract:

“Cataracts is a common ocular pathology where the crystalline lens tends to become opaque, degrading the quality of the retinal images because of the increase of both aberrations and scattering. In this work, we simultaneously generated and optically corrected the effects of cataracts in an optical bench by using a liquid crystal device spatial light modulator. The correction was carried out by implementing a feedback-based wavefront shaping technique with different spatial resolutions of the corrector phase maps. Its benefits were evaluated through objective and subjective descriptors of the quality of vision. The analysis of the experimental results, in addition to numerical calculations of the uncorrected and corrected ocular point spread functions, allowed us to understand the limitations of the technique and to present a strategy to overcome it for future in vivo applications.”

Link to Publications Page

Publication: Optica

Issue/Year/DOI: Vol. 7, Issue 1, pp. 22-27
DOI: 10.1364/OPTICA.7.000022

New Standard Diffractive Optical Elements

HOLOEYE already offers a broad range of standard polymer Diffractive Optical Elements. Standard Diffractive Optics are a fast and low cost way for proof-of-concept and product developments. Besides this with a standard size of 8 mm in diameter, these elements fit well into numerous standard laser modules and are already widely used by serveral laser module manufacturers within their products.

We currently added 10 new standard DOEs with different patterns: (more…)

Holographic near-eye display with continuously expanded eyebox using two-dimensional replication and angular spectrum wrapping

Author(s):

Myeong-Ho Choi, Yeon-Gyeong Ju and Jae-Hyeung Park

Abstract:

“Holographic near-eye displays present true three-dimensional images with full
monocular depth cues. In this paper, we propose a technique to expand the eyebox of the
holographic near-eye displays. The base eyebox of the holographic near-eye displays is determined
by the space bandwidth product of a spatial light modulator. The proposed technique replicates
and stitches the base eyebox by the combined use of a holographic optical element and high order
diffractions of the spatial light modulator, achieving horizontally and vertically expanded eyebox.
An angular spectrum wrapping technique is also applied to alleviate image distortions observed
at the boundaries between the replicated base eyeboxes.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Vol. 28, Issue 1, pp. 533-547
DOI: 10.1364/OE.381277