Attenuating wavefront determination for noise reduction

A projector system, comprising:

• a light source;
• a spatial light modulator including a substantially transparent material layer and a phase modulation layer, wherein the substantially transparent material layer is a cover glass having a transmissivity of 90% or greater;
• an imaging device configured to receive a light from the light source as reflected by the spatial light modulator, and to generate an image data, wherein the image data includes a first component corresponding to a portion of the light reflected by the substantially transparent material layer and a second component corresponding to a portion of the light reflected by the phase modulation layer;
• and
• a controller configured to:
• provide a phase-drive signal to the spatial light modulator for producing a reconstruction of the image data that is at least reduced in noise introduced by the substantially transparent material layer, and
• determine an attenuating wavefront of the substantially transparent material layer based on the image data by using phase-shifting holography,
• wherein the controller is further configured to:
• compute a plurality of attenuating wavefront candidates, and to select, as the attenuating wavefront, the attenuating wavefront candidate that yields a reconstruction having a smallest noise effect from among the plurality of attenuating wavefront candidates, and
• tune the phase-drive signal based on the attenuating wavefront.

A method of driving an optical system, comprising:

• providing a phase-drive signal to a spatial light modulator for producing a reconstruction of the image data that is at least reduced in noise introduced by a substantially transparent material layer, the spatial light modulator including the substantially transparent material layer and a phase modulation layer, wherein the substantially transparent material layer is a cover glass having a transmissivity of 90% or greater;
• generating an image data based on receiving a light from a light source that has been reflected by the spatial light modulator and received by an imaging device, wherein the image data includes a first component corresponding to a portion of the light reflected by the substantially transparent material layer and a second component corresponding to a portion of the light reflected by the phase modulation layer;
• and
• determining an attenuating wavefront of the substantially transparent material layer based on the image data using phase-shifting holography, wherein the method further comprises:
• computing a plurality of attenuating wavefront candidates, and
• selecting, as the attenuating wavefront, the attenuating wavefront candidate that yields a reconstruction having a smallest noise effect from among the plurality of attenuating wavefront candidates;
• and
• tuning the phase-drive signal based on the attenuating wavefront.

A non-transitory computer-readable medium storing instructions that, when executed by a processor of a computer, cause the computer to perform operations comprising:

• providing a phase-drive signal to a spatial light modulator for producing a reconstruction of the image data that is at least reduced in noise introduced by a substantially transparent material layer, the spatial light modulator including the substantially transparent material layer and a phase modulation layer, wherein the substantially transparent material layer is a cover glass having a transmissivity of 90% or greater;
• generating an image data based on receiving a light from a light source that has been reflected by the spatial light modulator and received by an imaging device, wherein the image data includes a first component corresponding to a portion of the light reflected by the substantially transparent material layer and a second component corresponding to a portion of the light reflected by the phase modulation layer;
• determining an attenuating wavefront of the substantially transparent material layer based on the image data using phase-shifting holography, the operations further comprising:
• computing a plurality of attenuating wavefront candidates, and
• selecting, as the attenuating wavefront, the attenuating wavefront candidate that yields a reconstruction having a smallest noise effect from among the plurality of attenuating wavefront candidates;
• and
• tuning the phase-drive signal based on the attenuating wavefront.