公开(公告)号：US10359630B2

公开(公告)日：2019-07-23

申请号：US15199221

申请日：2016-06-30

Applicant: Massachusetts Institute of Technology

Inventor： Manan Raval ,  Ami Yaacobi ,  Michael R. Watts ,  Jerry Zhou ,  Jie Sun ,  Christopher V. Poulton

IPC: G02F1/29 ,  G02B27/00 ,  G02B27/01

Abstract: A display for augmented reality (AR) includes an array of optical phased arrays (OPAs) integrated into a transparent substrate. The array of OPAs emit light encoded with four dimensional (4D) light field including 2D spatial coordinates and 2D directional coordinates to create an image of a virtual object on a retina of a viewer. By adjusting the emission directions of light beam emitted by individual OPAs in the display, the depth perception can be adjusted accordingly. The array of OPAs can also be encoded with holographic information, including intensity and phase distribution, of a virtual object to create the image of the virtual object on the retina. The AR display can further incorporate liquid crystal (LC) into the OPAs for modulating the amplitudes and relative phases of light emitted by the OPAs.

公开(公告)号：US10461489B2

公开(公告)日：2019-10-29

申请号：US15718045

申请日：2017-09-28

Applicant: Massachusetts Institute of Technology

Inventor： Purnawirman Purnawirman ,  Michael R. Watts ,  Ehsan Shah Hosseini ,  Jonathan B. Bradley ,  Jie Sun ,  Matteo Cherchi

IPC: H01S3/063 ,  H01S3/16 ,  H01S3/17 ,  H01S3/091 ,  H01S3/08 ,  H01S3/083 ,  H01S3/094 ,  H01S3/23 ,  H01S3/105

Abstract: Examples of the present invention include integrated erbium-doped waveguide lasers designed for silicon photonic systems. In some examples, these lasers include laser cavities defined by distributed Bragg reflectors (DBRs) formed in silicon nitride-based waveguides. These DBRs may include grating features defined by wafer-scale immersion lithography, with an upper layer of erbium-doped aluminum oxide deposited as the final step in the fabrication process. The resulting inverted ridge-waveguide yields high optical intensity overlap with the active medium for both the 980 nm pump (89%) and 1.5 μm laser (87%) wavelengths with a pump-laser intensity overlap of over 93%. The output powers can be 5 mW or higher and show lasing at widely-spaced wavelengths within both the C- and L-bands of the erbium gain spectrum (1536, 1561 and 1596 nm).