Abstract: An eye tracking system includes a pair of glasses including two frames, a projector coupled to the pair of glasses and operable to project a beam of light, and an eyepiece mounted in one of the two frames and optically coupled to the projector. The eyepiece is operable to direct at least a portion of the beam of light towards an eye of a user. The eye tracking system also includes one or more optical sensors coupled to at least one of the two frames of the pair of glasses and operable to detect a set of reflected signals off the eye of the user, and a processor coupled to the projector and the one or more optical sensors, wherein the processor is operable to determine an eye orientation based on the set of reflected signals.

Abstract: A rainbow artifact mitigation system includes an angular dependent filter configured to receive light and to transmit light according to one or more angular transmission functions. The one or more angular transmission functions define light transmission as a function of incident angle for the angular dependent filter, The angular dependent filter is configured to at least partially mitigate transmission of light for at least some incident angles above 40°. The angular dependent filter comprises a plurality of nanostructures, and the nanostructures of the plurality of nanostructures are arranged in an array with one or more sub-wavelength periods. The one or more angular transmission functions comprise at least two different angular transmission functions for different regions of the angular dependent filter.

Abstract: A surface height and focus sensing system is provided. In one embodiment, an illumination focus sensor is used in combination with a collimation adjustment element which drives the system such that an illumination focus height matches the workpiece surface height, which produces a null output from the illumination focus sensor. Under the null condition, the amount of collimation adjustment is directly related to the workpiece surface height, and the resulting height determination is relatively insensitive to the workpiece surface optical properties. In one embodiment, the amount of collimation adjustment is determined according to the control signal for the collimation adjustment element. In another embodiment, a collimation adjustment sensor is utilized to measure the amount of collimation adjustment.

Abstract: An extended range focus sensor is provided. In various embodiments, the focus sensor may include a relay lens assembly to image a plane between an objective lens and the relay lens arrangement to a plane near an entrance pupil of a focus detector arrangement of the focus sensor. In some embodiments, the objective lens pupil is imaged onto the focus detector entrance pupil. In some embodiments, an illumination beam passes through the relay lens arrangement and is magnified on its way to be output by the objective lens, and the reflected focus detection beam passes back through the objective lens and the relay lens arrangement and is reduced prior to being input to the focus detector arrangement. In some embodiments, the focus detector arrangement may comprising a broad range focus detector combined with a high resolution Shack-Hartmann focus detector, and in others a single extended range Shack-Hartmann focus detector is used.

Abstract: A surface height and focus sensing system is provided. In one embodiment, a wavefront sensor is used in combination with a collimation adjustment element which drives the system such that an illumination focus height matches the workpiece surface height, which produces a null output from the wavefront sensor. Under the null condition, the amount of collimation adjustment is directly related to the workpiece surface height, and the resulting height determination is relatively insensitive to the workpiece surface optical properties. In one embodiment, the amount of collimation adjustment is determined according to the control signal for the collimation adjustment element. In another embodiment, a second wavefront sensor is utilized to measure the amount of collimation adjustment.

Abstract: A surface height and focus sensing system is provided. In one embodiment, an illumination focus sensor is used in combination with a collimation adjustment element which drives the system such that an illumination focus height matches the workpiece surface height, which produces a null output from the illumination focus sensor. Under the null condition, the amount of collimation adjustment is directly related to the workpiece surface height, and the resulting height determination is relatively insensitive to the workpiece surface optical properties. In one embodiment, the amount of collimation adjustment is determined according to the control signal for the collimation adjustment element. In another embodiment, a collimation adjustment sensor is utilized to measure the amount of collimation adjustment.