Optical System with Phase Shifting Elements

An optical system providing randomly phase shifted light, comprising:

• a strip waveguide configured to emit light;
• a slab waveguide optically coupled to the strip waveguide and positioned to receive the light from the strip waveguide;
• a reflective element optically coupled to and positioned on an edge of the slab waveguide and configured to:
• receive the light from the slab waveguide;
• and
• reflect the light;
• and
• multiple phase shifting elements disposed on the slab waveguide and configured to:
• phase shift a first portion of the light by a first phase;
• and
• phase shift a second portion of the light by a second phase.

A method for providing a wavefront with randomized phase shifts of light, comprising:

• emitting light from a first waveguide into a second waveguide;
• reflecting the light from a reflective element that collimates the light and is positioned at an edge of the second waveguide;
• shifting a phase, using a first phase shifting element, of a first portion of light by a first phase;
• and
• shifting a phase, using a second phase shifting element, of a second portion of light by a second phase that is different than the first phase.