Brandon Hellman
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View article: Single-chip holographic beam steering for lidar by a digital micromirror device with angular and spatial hybrid multiplexing
Single-chip holographic beam steering for lidar by a digital micromirror device with angular and spatial hybrid multiplexing Open
A digital micromirror device (DMD) based holographic beam steering technique is reported that multiplexes fine-steering binary amplitude gratings with a coarse-steering programmable blazed grating. The angular spatial light modulation (ASL…
View article: Occlusion-capable optical-see-through near-eye display using a single digital micromirror device
Occlusion-capable optical-see-through near-eye display using a single digital micromirror device Open
Occlusion of a real scene by displayed virtual images mitigates incorrect depth cues and enhances image visibility in augmented reality applications. In this Letter, we propose a novel optical scheme for the occlusion-capable optical-see-t…
View article: Angular and spatial light modulation by single digital micromirror device for multi-image output and nearly-doubled étendue
Angular and spatial light modulation by single digital micromirror device for multi-image output and nearly-doubled étendue Open
The "Angular Spatial Light Modulator" (ASLM) achieves simultaneous angular and spatial light modulation at a plane by combining Digital Micromirror Device (DMD) based programmable blazed grating beam steering and binary pattern sequencing.…
View article: Single detector imaging lidar by digital micromirror device for large field-of-view and mid-range mapping applications
Single detector imaging lidar by digital micromirror device for large field-of-view and mid-range mapping applications Open
An imaging lidar system is presented which combines the high speed of a Digital Micromirror Device (DMD) and the higher range of a 1D collimated scanning output. The system employing 1D line object illumination along with DMD placed at foc…
View article: Light recycling beam steering on a DMD lidar
Light recycling beam steering on a DMD lidar Open
Spatial light modulators (SLMs) that operate in a phase modulation mode enable beam steering with higher diffraction efficiency compared to amplitude modulation mode, thus potentially be used for an efficient beam steering with no moving p…
View article: Multi-beam and single-chip LIDAR with discrete beam steering by digital micromirror device
Multi-beam and single-chip LIDAR with discrete beam steering by digital micromirror device Open
A novel Digital Micromirror Device (DMD) based beam steering enables a single chip Light Detection and Ranging (LIDAR) system for discrete scanning points. We present increasing number of scanning point by using multiple laser diodes for M…
View article: 3D visualization of optical ray aberration and its broadcasting to smartphones by ray aberration generator
3D visualization of optical ray aberration and its broadcasting to smartphones by ray aberration generator Open
The ray formalism is critical to understanding light propagation, yet current pedagogy relies on inadequate 2D representations. We present a system in which real light rays are visualized through an optical system by using a collimated las…
View article: Single chip lidar with discrete beam steering by digital micromirror device
Single chip lidar with discrete beam steering by digital micromirror device Open
A novel method of beam steering enables a large field of view and reliable single chip light detection and ranging (lidar) by utilizing a mass-produced digital micromirror device (DMD). Using a short pulsed laser, the micromirrors' rotatio…