Method and system for fiber scanning projector
A fiber scanning projector includes a piezoelectric element and a scanning fiber mechanically coupled to the piezoelectric element. The fiber scanning projector also includes an optical assembly section operable to receive light from the scanning fiber. The optical assembly section includes a prism element, a collimating element coupled to the prism element at an interface, a quarter wave plate, and a polarizing beam splitter disposed at the interface.
1. A projector comprising:
a scanning light source defining a convex object surface, wherein the convex object surface is substantially spherical and characterized by a radius of curvature; and
an optical assembly section operable to receive light from the scanning light source, wherein the optical assembly section comprises:
a prism element;
a collimating element coupled to the prism element at an interface, wherein the collimating element includes a reflective surface characterized by a second radius of curvature approximately twice the radius of curvature;
a quarter wave plate; and
a polarizing beam splitter disposed at the interface.
2. The projector of claim 1 wherein the scanning light source comprises a scanning waveguide source.
3. The projector of claim 2 wherein the scanning waveguide source comprises a fiber scanning element including a piezoelectric actuator and a scanning fiber mechanically coupled to the piezoelectric actuator.
4. The projector of claim 2 wherein the scanning waveguide source comprises a microelectromechanical system (MEMS) element including a cantilevered waveguide.
5. The projector of claim 2 wherein the scanning waveguide source comprises a waveguide tip operable to sweep through the convex object surface during oscillation.
6. A fiber scanning projector comprising:
a piezoelectric element;
a scanning fiber mechanically coupled to the piezoelectric element, wherein an output surface of the scanning fiber defines a convex object surface that is substantially spherical and characterized by a radius of curvature; and
an optical assembly section operable to receive light from the scanning fiber, wherein the optical assembly section comprises:
a prism element;
a collimating element coupled to the prism element at an interface, wherein the collimating element includes a collimating reflective surface characterized by a radius of curvature approximately twice the radius of curvature of the convex object surface;
a quarter wave plate; and
a polarizing beam splitter disposed at the interface.
7. The fiber scanning projector of claim 6 wherein the quarter wave plate is disposed between the polarizing beam splitter and the collimating reflective surface.
8. The fiber scanning projector of claim 6 wherein the prism element is optically bonded to the collimating element.
9. The fiber scanning projector of claim 6 wherein the scanning fiber passes through the piezoelectric element.
10. The fiber scanning projector of claim 6 wherein the prism element comprises an input surface having a non-planar curvature.
11. The fiber scanning projector of claim 6 wherein the collimating element comprises an output surface having a non-planar curvature.
12. The fiber scanning projector of claim 6 further comprising a waveguide display positioned at an exit pupil of the optical assembly section.
13. A fiber scanning projector comprising:
a piezoelectric element;
a scanning fiber passing through and mechanically coupled to the piezoelectric element, wherein the scanning fiber emits light along an optical path and an output surface of the scanning fiber defines a convex object surface;
a mirror including an aperture, wherein the scanning fiber passes through the aperture; and
a collimating mirror disposed along the optical path and characterized by a radius of curvature approximately twice a radius of curvature of the convex object surface.
14. The fiber scanning projector of claim 13 wherein the collimating mirror is disposed at an angle of approximately 45° to the optical path.