An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

Provided is a pointing device having an optical module for coordinate tracking in order to solve the problem that a pointing device using the diffraction principle of light increases in size due to an optical module, wherein the optical module comprises: a light-emitting unit which irradiates light toward an outside surface; a lens unit provided between the light-emitting unit and the outside surface to refract and diffract the light; and a light receiving unit to which the light reflected from the outside surface through the lens unit reaches, wherein the light receiving unit comprises a detector which senses the reflected light, and a light receiving surface of the detector is inclined at a specific angle toward the optical axis of the light-emitting unit.

A meta projector includes an edge emitting device configured to emit light through a side surface thereof, a meta-structure layer spaced apart from the upper surface of the edge emitting device that includes a plurality of nanostructures having a sub-wavelength shape dimension smaller than a wavelength of the light emitted from the edge emitting device, and a path changing member configured to change a path of the light emitted from the edge emitting device so as to direct the path toward the meta-structure layer. The meta projector may thus be configured to emit a light pattern of structured light, based on directing the light emitted from the edge emitting device through the meta-structure layer, while having a relatively compact device size.

A meta projector includes an edge emitting device configured to emit light through a side surface thereof, a meta-structure layer spaced apart from the upper surface of the edge emitting device that includes a plurality of nanostructures having a sub-wavelength shape dimension smaller than a wavelength of the light emitted from the edge emitting device, and a path changing member configured to change a path of the light emitted from the edge emitting device so as to direct the path toward the meta-structure layer. The meta projector may thus be configured to emit a light pattern of structured light, based on directing the light emitted from the edge emitting device through the meta-structure layer, while having a relatively compact device size.

Disclosed are a diffractive optical assembly, a laser projection unit, and a depth camera. The diffractive optical assembly includes a sealing assembly and a diffractive optical element. The sealing assembly includes a light transparent first sealing plate, a light transparent second sealing plate, and a spacer. The first sealing plate and the second sealing plate are arranged opposite to each other. The spacers spaces the first sealing plate and the second sealing plate apart. The first sealing plate, the second sealing plate and the spacer cooperatively defines a closed receiving cavity. The diffractive optical element is accommodated in the receiving cavity. The diffractive optical element includes a light transparent diffractive body and a diffractive structure formed on the diffractive body.

Disclosed are a diffractive optical assembly, a laser projection unit, and a depth camera. The diffractive optical assembly includes a sealing assembly and a diffractive optical element. The sealing assembly includes a light transparent first sealing plate, a light transparent second sealing plate, and a spacer. The first sealing plate and the second sealing plate are arranged opposite to each other. The spacers spaces the first sealing plate and the second sealing plate apart. The first sealing plate, the second sealing plate and the spacer cooperatively defines a closed receiving cavity. The diffractive optical element is accommodated in the receiving cavity. The diffractive optical element includes a light transparent diffractive body and a diffractive structure formed on the diffractive body.

A structured light system may include a semiconductor laser to emit light and a diffractive optical element to diffract the light such that one or more diffracted orders of the light, associated with forming a structured light pattern, are transmitted by the diffractive optical element. The diffractive optical element may be arranged such that the light is to be incident on the diffractive optical element at a substantially non-normal angle of incidence. The substantially non-normal angle of incidence may be designed to cause the diffractive optical element to transmit a zero-order beam of the light outside of a field of view associated with the diffractive optical element.

A system includes a light transmitter configured to emit a first light beam. The first light beam includes a primary portion and an amplified spontaneous emission (ASE) portion. The system also includes a host material configured to receive the first light beam and emit a second light. The host material is configured to generate the second light by depopulation of chromophores of one or more dopants in the host material caused by energy of the primary portion of the first light beam. The second light is continuous wave and speckle free.

A system includes a light transmitter configured to emit a first light beam. The first light beam includes a primary portion and an amplified spontaneous emission (ASE) portion. The system also includes a host material configured to receive the first light beam and emit a second light. The host material is configured to generate the second light by depopulation of chromophores of one or more dopants in the host material caused by energy of the primary portion of the first light beam. The second light is continuous wave and speckle free.

There is provided an information processing apparatus including: a recognition unit which recognizes an irradiation position of laser light by a laser pointer to a projection image; an acquisition unit which acquires movement information of the laser pointer; and an output unit which outputs a control signal for causing display of an object within a projection image corresponding to the irradiation position to be changed in accordance with the movement information.