Provided is a polarization splitting device. The polarization splitting device includes a first optical element. The first optical element comprises a light incident surface, a polarization splitting interface and a reflective interface, and the polarization splitting interface and the reflective interface are correspondingly arranged. Incident light enters the first optical element through the light incident surface, and is split into first light and second light through the polarization splitting interface; the first light is incident on the reflective optical element after being reflected by the reflective interface: and the second light exits from the first optical element after being transmitted through the polarization splitting interface.

Provided is a polarization splitting device. The polarization splitting device includes a first optical element. The first optical element comprises a light incident surface, a polarization splitting interface and a reflective interface, and the polarization splitting interface and the reflective interface are correspondingly arranged. Incident light enters the first optical element through the light incident surface, and is split into first light and second light through the polarization splitting interface; the first light is incident on the reflective optical element after being reflected by the reflective interface: and the second light exits from the first optical element after being transmitted through the polarization splitting interface.

A laser projection system is provided that includes at least one pickoff element or pickoff interface that redirects a portion of input laser light toward one or more photodetectors for purposes such as laser output power monitoring. An interface of a given pickoff element or a given pickoff interface uses Fresnel reflection to redirect the input laser light. The Fresnel reflection occurs due to a difference in indices of refraction between two materials that meet to form that interface. In some embodiments, a pickoff element is disposed in an optical path between a beam combiner and an optical scanner of the system. The pickoff element can be a plate beamsplitter, a cube beamsplitter, or a prism. In some embodiments, at least one pickoff interface is provided between two or more substrates of the beam combiner, the substrates that form a given pickoff interface having different respective indices of refraction.

A method of operating an apparatus for laser annealing, includes reducing temporal or spatial coherency of a plurality of laser beams by beam superimposing; and reducing an electric field inner product magnitude of beams having the reduced temporal or spatial coherency by a fly eye lens array to reduce coherency, and/or by modifying a polarization state between the beams by beam superimposing.

A head-mounted device (HMD) contains a display, an optics block, a redirection structure, and an eye tracking system. The display is configured to emit image light and provide it to an eye of a user. The optics block is configured to direct the emitted light in order to allow it to reach the eye. The eye tracking system contains a camera, an illumination source, and a controller. The camera is configured to capture image data using infrared light reflected from the eye. The controller is configured to use this image data to determine eye tracking information. The illumination source is configured to illuminate the eye with infrared light for the purpose of taking eye tracking measurements. The redirection structure is configured to direct infrared light reflected from the eye to the eye tracking system. In multiple embodiments, redirection structures may comprise prism arrays, lenses, liquid crystal layers, or grating structures.

There is provided an optical device, including an input aperture, an output aperture, at least first and second light-transmitting substrates each having two major surfaces and edges, an input surface for coupling light waves into the substrate for effecting total internal reflection inside the substrate, and an output surface for coupling light waves out of the substrate, a major surface of the first substrate is attached to a major surface of the second substrate and the input surface of the first substrate is a partially reflecting surface, such that part of the light waves passing through the input aperture is partially reflected by the partially reflecting input surface and coupled into the first substrate and another part passes through the partially reflecting input surface and is coupled by the input surface of the second substrate into the second substrate.

Provided are an augmented reality optical module, including a first lens, a second lens, a third lens group, a first polarization modulation unit provided on a side of the third lens group and configured to modulate the light emitted by the image source into first circularly polarized light, an angle selection film provided on a first surface of one side of the first lens and configured to reflect light having an incidence angle greater than or equal to a first angle and transmit light having an incidence angle smaller than or equal to a second angle, and a second polarization modulation unit provided on the other side of the first lens and configured to modulate incident circularly polarized light into linearly polarized light.

Provided are an augmented reality optical module, including a first lens, a second lens, a third lens group, a first polarization modulation unit provided on a side of the third lens group and configured to modulate the light emitted by the image source into first circularly polarized light, an angle selection film provided on a first surface of one side of the first lens and configured to reflect light having an incidence angle greater than or equal to a first angle and transmit light having an incidence angle smaller than or equal to a second angle, and a second polarization modulation unit provided on the other side of the first lens and configured to modulate incident circularly polarized light into linearly polarized light.

Methods and systems for determining an individual gaze value are disclosed herein. An exemplary method involves: (a) receiving gaze data for a first wearable computing device, wherein the gaze data is indicative of a wearer-view associated with the first wearable computing device, and wherein the first wearable computing device is associated with a first user-account; (b) analyzing the gaze data from the first wearable computing device to detect one or more occurrences of one or more advertisement spaces in the gaze data; (c) based at least in part on the one or more detected advertisement-space occurrences, determining an individual gaze value for the first user-account; and (d) sending a gaze-value indication, wherein the gaze-value indication indicates the individual gaze value for the first user-account.

Methods and systems for determining an individual gaze value are disclosed herein. An exemplary method involves: (a) receiving gaze data for a first wearable computing device, wherein the gaze data is indicative of a wearer-view associated with the first wearable computing device, and wherein the first wearable computing device is associated with a first user-account; (b) analyzing the gaze data from the first wearable computing device to detect one or more occurrences of one or more advertisement spaces in the gaze data; (c) based at least in part on the one or more detected advertisement-space occurrences, determining an individual gaze value for the first user-account; and (d) sending a gaze-value indication, wherein the gaze-value indication indicates the individual gaze value for the first user-account.