An optical device for a head-mounted display device includes a first partial reflector and a second partial reflector positioned relative to the first partial reflector so that the second partial reflector receives first light transmitted through the first partial reflector and reflects at least a portion of the first light toward the first partial reflector as second light. At least a portion of the second light is reflected by the first partial reflector as third light, and at least a portion of the third light is transmitted through the second partial reflector. At least one of the first partial reflector or the second partial reflector includes a reflective holographic element.

The present disclosure discloses a telephoto optical imaging system and zoom camera apparatus. The telephoto optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power, a second lens having negative refractive power, an optical path turning prism, and a triangular prism. A total effective focal length F1 of the telephoto optical imaging system may satisfy F1>40 mm. The zoom camera apparatus includes the telephoto optical imaging system and a short-focus optical imaging system arranged in parallel with the telephoto optical imaging system. A total effective focal length F1 of the telephoto optical imaging system and a total effective focal length F2 of the short-focus optical imaging system satisfy F1/F2>5.

Dielectric resonators provide a building block for the development of low-loss resonant metamaterials because they replace lossy ohmic currents of metallic resonators with low-loss displacement currents. The spectral locations of electric and magnetic dipole resonances of a dielectric resonator can be tuned by varying the resonator geometry so that desired scattering properties are achieved.

Folding optics are used in conjunction with a lens system to reduce a back focal length of a head-mounted display. The lens system provides optical power to focus light from an optical display. The folding optics reflects light to fold upon itself to reduce a distance between the lens system and the optical display.

A novel infinite mirror liquid cooler device is configured to comprise a printed circuit board (PCB); a logo component; a light-guiding component; a light-guiding component comprising a light-guiding surface; a lower mirror, the lower mirror; a hollow cover; the upper mirror; an upper cover of a pump chamber; an impeller; a lower cover of the pump chamber; a lower base; a pad; and a copper base plate according to some embodiments.

Systems and methods providing non-contact confinement and vibration isolation of electromagnetic resonators are provided herein. In certain embodiments, a device includes an electromagnetic resonator body. The device further includes a frame enclosing a volume, wherein the electromagnetic resonator is located within the volume. Additionally, the device includes a plurality of body electrodes mounted on the electromagnetic resonator body. Also, the device includes a plurality of frame electrodes mounted on the frame. Moreover, the device includes an electrode controller, wherein the electrode controller drives the plurality of frame electrodes to isolate the electromagnetic resonator body from vibrations to the frame by allowing a rattle space between external surfaces of the electromagnetic resonator body and internal surfaces of the frame to approach but be greater than zero.

An optical transmitter and a method of producing a low-photon-density modulated optical signal are disclosed. The optical transmitter and method include an optical source configured to emit a continuous optical carrier waveform, a dilation module configured to apply a spreading code to a data payload to spread each of the plurality of symbols in time to expand the symbol duration by a dilation factor and produce a corresponding plurality of time-dilated symbols, the plurality of time-dilated symbols having a lower photon density than the plurality of symbols; a mapping module configured to map the plurality of time-dilated symbols to a modulation scheme; and a modulator configured to modulate the optical carrier waveform with the plurality of time-dilated symbols according to the modulation scheme to produce the low-photon-density modulated optical signal encoded with the plurality of time-dilated symbols corresponding to the data payload.

An optical receiver includes a photonic integrator configured to accumulate optical signal energy corresponding to the input optical signal during an integration period, and to produce an output optical signal at an end of the integration period, the output optical signal having a higher intensity than the input optical signal, a shutter operable between a closed position and an open position, the shutter configured to prevent the output optical signal from exiting the photonic integrator when in the closed position and to allow the output optical signal to exit the photonic integrator when in the open position, a synchronizer coupled to the shutter and configured to control the shutter between the open position and the closed position; and a photodetector configured to receive the output optical signal when the shutter is in the open position and to produce an electrical signal corresponding to the output optical signal.

Systems and methods of the present disclosure are directed to optics used in absorption cell spectrometers. The absorption cell includes a plurality of mirrors arranged in a manner such that a detection light traverses multiple passes through the fluid within the absorption cell. In some implementations, the detection light is reflected by the plurality of mirrors to form optical paths in more than one plane. In some implementations, the orientation of the mirrors are aligned with specific orientations to provide the desired optical path to the detection light. In one or more embodiments, an alignment apparatus can be used to pre-align the mirrors before they are placed within the absorption cell. The alignment apparatus includes an aperture plate and an adjustable mount to mount one or more mirrors. The mirrors are aligned based on reflected images on the aperture plate laser light incident on the mirrors.

High-performance polarization-based triple-pass lenses require precise management of polarization over a range of incidence angles and wavelengths. These lenses have the potential to provide high optical power in a compact arrangement, as needed for (e.g.) wide field-of-view near-eye immersive display applications. Accordingly, disclosed herein is a wide-angle polarization-based triple-pass lens that includes an input polarizer producing a first transmitted linear polarization; a first retarder-stack for converting from linear-polarization to circular-polarization; a curved partial-reflector; a second retarder-stack for converting from circular-polarization to linear-polarization; a reflective linear-polarizer; and a geometric-compensator (GC) between the input polarizer and the first retarder-stack, the second quarter-wave retarder and the reflective linear-polarizer, or both. The GC reduces the first-pass transmission of the lens for rays incident off-normal.