The present disclosure relates to a reflective device and a display apparatus. In one embodiment, a reflective device includes: a resonant cavity configured to reflect a light of a first wavelength range; and a light conversion structure disposed within the resonant cavity and configured to convert an incident light of a second wavelength range into the light of the first wavelength range.

A projection apparatus includes a light source for emitting light with an initial spectral distribution, an optical element, and a projection surface. The optical element is arranged in a beam path of light emitted from the light source between the light source and the projection surface. The optical element includes a number of pixels. The pixels of the optical element are each configured to convert light with the initial spectral distribution into light with a predetermined final spectral distribution different from the initial spectral distribution.

The spin-entangled photon emission device comprises a Fabry-Pérot resonator with a solid state optical waveguide integrated on a substrate. Preferably, the device is used in a configuration that makes it possible to tune the resonance wavelength of the Fabry-Pérot resonator by straining or otherwise adjusting the effective optical length of the waveguide. A diamond membrane is located in the Fabry-Pérot resonator. The diamond membrane comprises a photon-source capable of emitting a photon that is entangled with a spin state of the photon source. A first surface of the diamond membrane abuts to a first minor of the Fabry-Pérot resonator. The optical waveguide has a first end facet bonded to a first surface of the diamond membrane. The first mirror of the Fabry-Pérot resonator is formed by a reflector on the second surface of the diamond membrane. The second mirror of the Fabry-Pérot resonator is formed by a reflector on a second end facet of the optical waveguide or inside the optical waveguide.

Provided are an optical modulating device and a system including the optical modulating device. The optical modulating device includes a substrate, and a phase modulator formed on the substrate and including a Fabry-Perot cavity. The Fabry-Perot cavity of the phase modulator includes a first reflective layer, a second reflective layer, and a tunable core formed between the first reflective layer and the second reflective layer, wherein the tunable core is formed of a semiconductor material and is configured to modulate a phase of light corresponding to modulation of a refractive index of the tunable core according to electrical control.

A gain medium is pumped by a source. An optical wave passes through a photonic integrated circuit (PIC) that comprises: a substrate comprising Silicon, a plurality of photonic structures, an input port coupling an optical wave into a waveguide formed in the PIC, and an output port coupling an optical wave out of a waveguide formed in the PIC. Propagation of an optical wave circulating around a closed path of a laser ring cavity is limited using an optical isolator such that, when the pump source exceeds a lasing threshold, the optical wave propagates in a single direction through the gain medium and the PIC. From output coupler, an output that is provided that comprises a fraction of the power of an optical wave that is incident upon the output coupler, and remaining power of the optical wave is redirected around the closed path of the laser ring cavity. The fraction can be greater than 0.5.

Disclosed are an optical modulation device and a phase modulation method using the same. The optical modulation device includes a reflection plate, an insulating film over the reflection plate, dielectric patterns aligned on the insulating film in a first direction and extended in parallel in a second direction intersecting the first direction, and first and second graphene patterns provided between the dielectric patterns and alternately aligned in the first direction. The dielectric patterns and the first and second graphene patterns fully cover the top of the insulating film. Two dielectric patterns adjacent to each other in the first direction with one of the first graphene patterns interposed therebetween form one dielectric pattern pair. The dielectric pattern pair is provided in plural. The dielectric pattern pairs are isolated from each other in the first direction with one of the second graphene patterns interposed therebetween. A width of each of the first graphene patterns in the first direction is different from a width of each of the second graphene patterns in the first direction.

Provided are an optical modulating device and a system including the optical modulating device. The optical modulating device includes a substrate, and a phase modulator formed on the substrate and including a Fabry-Perot cavity. The Fabry-Perot cavity of the phase modulator includes a first reflective layer, a second reflective layer, and a tunable core formed between the first reflective layer and the second reflective layer, wherein the tunable core is formed of a semiconductor material and is configured to modulate a phase of light corresponding to modulation of a refractive index of the tunable core according to electrical control.

Conformal vision with enhanced image processing of the outputted image is incorporated into novel applications. The conformal vision provides enhanced contrast by the combined inclusion of tunable filters and processing of the images that are generated by the detector. Furthermore, novel uses and applications of the conformal vision enable users to make determinations related to their health and wellness utilizing information provided by the conformal vision.

Chip technology for fabricating ultra-low-noise, high-stability optical devices for use in an optical atomic clock system. The proposed chip technology uses diamond material to form stabilized lasers, frequency references, and passive laser cavity structures. By utilizing the exceptional thermal conductivity of diamond and other optical and dielectric properties, a specific temperature range of operation is proposed that allows significant reduction of the total energy required to generate and maintain an ultra-stable laser. In each configuration, the diamond-based chip is cooled by a cryogenic cooler containing liquid nitrogen.

Optical system (20) comprising two optical fibres (3, 5) which are configured to define between them a Fabry-Perot cavity, and a connecting element (7) bonded to each of the two optical fibres (3, 5), the connecting element (7) defining a through-passage, at least one of the two optical fibres (3, 5) comprising an end portion (22, 23) arranged in the through-passage and bonded to the connecting element (7), the two optical fibres (3, 5) extending along an axis (A) and being separated from one another by a distance Lc parallel to the axis (A), one of the optical fibres being bonded to the connecting element at a first bonding zone, and the other optical fibre being bonded to the connecting element at a second bonding zone separated from the first bonding zone by distance L1 parallel to the axis (A), wherein the two optical fibres (3, 5) have a first thermal expansion coefficient, and the connecting element (7) has a second thermal expansion coefficient, so that the first thermal expansion coefficient is equal to the product of the second thermal expansion coefficient multiplied by the term (1−Lc/L1) to within a margin of 10.sup.−6.