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DMD-illumination-coupler

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DMD illumination coupler

Details

Inventors: McDonald, Mark;
Assignee: Siros Technologies, Inc. (San Jose, CA)
Primary Examiner: Epps; Georgia
Assistant Examiner: Burke; Margaret
Attorney, Agent or Firm: Lumen Intellectual Property Services

A DMD illumination coupler, and a method of improving the wavefront quality of a transmitted illumination beam over the prior art using the invented DMD illumination coupler are disclosed. The invented DMD illumination coupler comprises an angularly selective reflective thin film. The invented DMD illumination coupler has the characteristics of high optical quality and cost effectiveness. The application of the invented DMD illumination coupler in holographic systems is also discussed.

DETAILED DESCRIPTION FIG.
3 is a schematic drawing of an alternative embodiment of present invention.
A DMD light coupler 300 comprises three prisms, a 45-45-90 degree prism 316, two 30-60-90 degree prisms 318 and 320, and an angular selective thin film 322.
All of these prisms are commercially available.
A side surface of the prism 316 is attached to a short side surface of the prism 318.
The angle between the hypotenuse side surface of the prism 316 and the hypotenuse side surface of the prism 318 is 15 degrees.
The hypotenuse side surface of the prism 320 is attached to the hypotenuse side surface of the prism 318, such that the short side surface of the prism 318 and the side surface of the prism 320 are parallel with each other.
The angularly selective thin film 322 is coated on the hypotenuse surface of either the prism 318 or the prism 320.
An illumination light beam is divided into several portions.
A first portion S(1) which is incident on the hypotenuse surface of the prism 316 is labelled as light beam 302.
Light beam 302 is perpendicular to the side surface of the prism 316 which is attached to the short side surface of the prism 318.
A second portion S(2) which is refracted by the first hypotenuse surface and incident on the second hypotenuse surface, comprises light beam 304 and light beam 306.
Light beam 304 passes the prism 316 and enters the prism 318.
Light beam 304 will be refracted at the interface of the prism 316 and the prism 318 if the two prisms are made of different materials.
The light beam 306 is reflected by the angularly selective film 322.
A third portion S(3) which is reflected by the angularly selective thin film 322, and incident on the fourth side surface is labelled as light beam 308.
Light beam 308 is refracted at the long side surface of the prism 318.
A fourth portion S(4) which is refracted by the fourth side surface and incident on the micro-mirror 104 of the DMD 102 is labelled as light beam 310.
The micro-mirror 310 reflects light beam 310 to produce a fifth portion S(5), which is labelled as light beam 312

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