Patent ID: 9134537
Filing Date: 2015-09-15
Classification: G02B,G02F

Abstract:
1. A laser lighting device comprising: a light source for emitting pulsed laser light; one or more fly's eye lenses disposed in an optical path of the pulsed laser light from the light source, the fly's eye lenses configured for homogenizing the intensity of said pulsed laser light in a plane perpendicular to an optical axis of said pulsed laser light; a plurality of condenser lenses disposed in the optical path of the pulsed laser light having passed through said fly's eye lenses, the condenser lenses configured for collimating incident light, and allowing the collimated light to pass therethrough; a first electro-optical crystal element disposed in the optical path of said pulsed laser light in a position between said light source and a condenser lens disposed in a last stage, the first electro-optical crystal element configured for continuously changing a deflection direction of incident light in a direction X in a plane perpendicular to an optical axis of said laser light, and allowing the deflected light to pass therethrough; a second electro-optical crystal element disposed in the optical path of said pulsed laser light in a position between said light source and the condenser lens disposed in the last stage, the second electro-optical crystal element configured for continuously changing a deflection direction of incident light in a direction Y perpendicular to the direction X in the plane perpendicular to the optical axis of said laser light, and allowing the deflected light to pass therethrough; a half-wave plate disposed between said first electro-optical crystal element and said second electro-optical crystal element for rotating the polarization plane of the laser light having passed through said first electro-optical crystal element by 90°, and then making the laser light being incident on the second electro-optical crystal element; and a controller for controlling voltages applied to said electro-optical crystal elements in association with each other to continuously move interference fringes two-dimensionally in a plane irradiated with light having passed through said fly's eye lenses.