Speckle-reduction in virtual and augmented reality systems and methods
AssigneeMagic Leap, Inc.
InventorPierre St. Hilaire
Life of this patent
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Abstract
An imaging system includes a diffusing element configured to couple portions of a light beam back into a laser diode. The system includes a diode laser driven into a chaotic regime by a combination of a diffuser and a modulated drive current such that it emits light across a frequency spectrum having an envelope between 3 and 10 nanometers wide. The system further includes a diffusing element at least 0.1 mm to 0.5 mm away from the diode laser to couple portions of the light beam back into the laser diode. Another embodiment is directed to using the diffusing element to illuminate a flat panel display or a spatial light modulator.
Claims8
An imaging system for reducing laser speckling, the imaging system comprising:
- a laser diode to generate a light beam having a wavelength within a visible spectrum;
- a modulator to vary a current for driving the laser diode;
- and
- a diffuser to receive the light beam, wherein the diffuser comprises a random patterned surface or a pseudo-random surface configured to cause a reflected portion of the light beam to bounce off the random patterned surface or the pseudo-random surface and scatter back into the laser diode as reflected rays to generate a chaotic laser pattern, and further to cause a transmitted portion of the light beam to pass therethrough.
Dependencies are inferred from the claim text.