An illuminator usable for illuminating a display panel is disclosed. The illuminator uses a pupil-replicating waveguide to expand a pair of light beams propagating in the waveguide. The light beams may be coupled at a same edge and/or at opposite edges of the waveguide, and are configured to fill each other's dark spots between out-coupled beam portions of the light beams. To improve the illumination uniformity, the two light beams may be orthogonally polarized, and the out-coupling grating strength may be spatially varied along the waveguide.

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.

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.

One embodiment of the present disclosure provides an external detection see-through door of a cabinet that stores objects. The external detection see-through door includes a transmission window, a sensor configured to detect a specific external condition in front of the transmission window, a light emitting module configured to increase an amount of emitted light according to a signal from the sensor, which has detected the specific external condition, to increase an amount of light that is reflected from inside the cabinet and heads toward the transmission window, and an optical film that is provided on the transmission window and has a light transmittance that prevents the cabinet from being see-through from the outside before the sensor detects the specific condition and allows the cabinet to be see-through from the outside due to light that is reflected from inside the cabinet and transmitted through the transmission window and the optical film due to the light emitting module increasing the amount of emitted light according to the signal from the sensor that has detected the specific external condition.

A waveguide combiner includes an in-coupling area, a waveguide body, an out-coupling area and at least one film layer. The in-coupling area is configured to introduce a light beam. The waveguide body is configured to guide the light beam introduced by the in-coupling area. The out-coupling area is configured to output the light beam guided by the waveguide body. Said at least one film layer is embedded in at least one portion of the in-coupling area, the waveguide body and the out-coupling area. Said at least one film layer is configured to divide said at least one portion of the in-coupling area, the waveguide body and the out-coupling area into a plurality of layers, and the light beam is reflected by said at least one film layer or penetrates said at least one film layer between different layers of the plurality of layers.

A mirror unit 2 includes a mirror device 20 including a base 21 and a movable mirror 22, an optical function member 13, and a fixed mirror 16 that is disposed on a side opposite to the mirror device 20 with respect to the optical function member 13. The mirror device 20 is provided with a light passage portion 24 that constitutes a first portion of an optical path between the beam splitter unit 3 and the fixed mirror 16. The optical function member 13 is provided with a light transmitting portion 14 that constitutes a second portion of the optical path between the beam splitter unit 3 and the fixed mirror 16. A second surface 21b of the base 21 and a third surface 13a of the optical function member 13 are joined to each other.

A method includes capturing, using an Internet of Things (IoT) device, real-time video of a user performing an exercise associated with a first exercise class. Real-time video of the user is displayed, via a display, concurrently with video of an instructor, to provide a visual comparison of the user to the instructor. Image analysis of the real-time video of the user is performed to determine a performance of the user, and a representation thereof is displayed. Biometric data associated with the user is received at the IoT device from a wearable device at multiple points in time. Heart rates are identified based on the biometric data, and scores based on the heart rates are displayed via the display. A recommendation for a second exercise class different from the first exercise class is determined based on a profile of the user, and displayed via the display.

An apparatus (10) for increasing a pulse length of a pulsed radiation beam, the apparatus comprising: a beam splitter (16) configured to split an input radiation beam (18) into a first beam (24) and a second beam (22); an optical arrangement (12, 14), wherein the beam splitter and the optical arrangement are configured such that at least a portion of the first beam is recombined with the second beam into a modified beam after an optical delay of the first beam caused by the optical arrangement; and at least one optical element (30) in an optical path of the first beam, the at least one optical element configured such that the phase of different parts of a wavefront of the first beam is varied to reduce coherence between the first beam and the second beam.

A smart mirror can show live or recorded streaming video of an instructor performing a workout in a package that is attractive and unobtrusive enough to hang in a living room. The smart mirror includes a mirror surface with a fully reflecting section and a partially reflecting section. A display behind the partially reflecting section shows the video when the smart mirror is on and is almost invisible when the smart mirror is off. The smart mirror also has a speaker, a microphone, and a camera to enable a user to view the video content and interact with the instructor. The smart mirror may connect to the user's smart phone, a peripheral device (e.g., a Bluetooth speaker) to augment user experience, a biometric sensor to provide biometric data to assess user performance, and/or a network router to connect the smart mirror to a content provider, an instructor, and/or other users.

A beam splitting element as provided includes an optical substrate and a diffuse reflection layer. The optical substrate is configured to reflect or allow the incident beam to pass through. The diffuse reflection layer is disposed on a portion of a surface of the optical substrate. The incident beam is split into first and second split beams through the beam splitting element and satisfies one of the following conditions: field angles of the first and second split beams exit from the beam splitting element are different; the field angles of the first and second split beams exit from the beam splitting element are the same, and exit directions of the first and second split beams are parallel to each other. A projection device having the beam splitting element is also provided.