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 imagining system for reducing laser speckling, the imagining system comprising:
- a diode laser to generate a light beam, wherein the light beam has a wavelength within a visible spectrum;
- a modulator to vary a current for driving the diode laser;
- and
- a diffuser to receive the light beam, wherein the diffuser is configured to reflect back a portion of the light beam into the laser diode as reflected light beams to generate a chaotic laser pattern.
Dependencies are inferred from the claim text.