A laser light source may include an arrangement of surface-emitting semiconductor lasers to which a voltage is applied such that an operating current is below the threshold current and an intrinsic emission of the surface-emitting semiconductor laser is prevented. The laser light source also comprises a first semiconductor laser which emits radiation that enters the surface-emitting semiconductor laser such that induced emission takes place via the injection locking mechanism and the individual surface-emitting semiconductor lasers emit laser light having the same wavelength and polarisation direction as the irradiated radiation. The emission frequency of the first semiconductor laser can be changed by changing the operating current.

Embodiments of this application provide a radar system, and a signal processing method and apparatus. The radar system includes: a transmitting assembly, a receiving assembly, and a controller. The transmitting assembly is configured to generate and transmit N first signals, where characteristics of the N first signals are different, the characteristic includes a wavelength and/or a delay, and N is an integer greater than 1; the receiving assembly is configured to receive a second signal; and the controller is configured to determine, based on the characteristics of the N first signals, whether the second signal includes an echo signal corresponding to the first signal.

An optical device (100) has a field of view (F) which enlarges as advancing toward one direction from a predetermined position. A housing (200) includes a transmission unit (210). The transmission unit (210) crosses the field of view (F). The housing (200) accommodates the optical device (100). The transmission unit (210) includes a first side (212) and a second side (214). The second side (214) is located on an opposite side to the first side (212). A width of the transmission unit (210) on a side with the second side (214) is narrower than a width of the transmission unit (210) on a side with the first side (212). The second side (214) of the transmission unit (210) is located closer to the predetermined position in the one direction than the first side (212) of the transmission unit (210).

An imaging device includes: an area light source including an emission surface from which a sub-terahertz wave is emitted to a measurement target; and a detector including an image sensor that receives a reflected wave generated by the measurement target reflecting the sub-terahertz wave emitted from the emission surface. The area light source includes: at least one point light source that emits a sub-terahertz wave; and a reflector that reflects the sub-terahertz wave emitted from the at least one point light source, to generate a sub-terahertz wave to be emitted from the emission surface. The reflector has a reflection surface that is a bumpy surface which includes two or more frequency components in a spatial frequency range and whose roughness curve element mean length RSm is at least 0.3 mm.

A method for operating a sensor system may include predefining a spatial region to be detected in the surroundings of a light emission device, scanning the predefined spatial region by light beams emitted by the light emission device in different spatial directions, driving an emitter with a control unit based on a random component, emitting light beams from the emitter in the direction of a scanning unit at random points in time, and deflecting the light beams, using the scanning unit, in the different spatial directions along which the light beams leave the light emission device. The sensor system may include the control unit and the light emission device where the light emission device includes the emitter and the scanning unit.

A phased array lidar includes: a laser generator (100) configured to generate original laser; an optical transmitting medium (400); an optical splitting apparatus (200) coupled to the laser generator (100) through the optical transmitting medium (400); the optical splitting apparatus (200) including a device configured to receive the original laser; and Z radiation units (300), each being respectively coupled to the optical splitting apparatus (200), where Z is a natural number greater than 1. The optical splitting apparatus (200) is configured to split the original laser into Z first optical signals, and send each of the Z first optical signals respectively to the radiation units (300), so that electromagnetic waves radiated by all of the radiation units (300) are combined into a beam of radar waves. The laser generator (100), the device, and the optical transmitting medium (400) are made of a material capable of transmitting laser having power greater than a set power value.

Embodiments discussed herein refer to LiDAR systems and methods that monitor for fault conditions that could potentially result in unsafe operation of a laser. The systems and methods can monitor for faulty conditions involving a transmitter system and movement of mirrors in a scanning system. When a fault condition is monitored, a shutdown command is sent to the transmitter system to cease laser transmission. The timing by which the laser should cease transmission is critical in preventing unsafe laser exposure, and embodiments discussed herein enable fault detection and laser shutoff to comply with laser safety standards.

The laser distance measuring device includes: a laser light emission unit for emitting laser light; a scanning mechanism for scanning the laser light by changing an output angle thereof; a light receiving unit for receiving reflected light of the laser light from an object, to thereby output a light reception signal; a light-detector control circuit for causing the light receiving unit to output the reception signal after setting a light receiving sensitivity for the reflected light at the time when the output angle is small, higher than a light receiving sensitivity for the reflected light at the time when the output angle is large; and a distance calculation unit for calculating, based on the reception signal, a distance to the object. This enhances the distance measuring capability in both cases of measuring a short distance and a long distance.

Provided is a laser device, comprising a laser light source, a collimating lens that collimates the light output from the laser light source, and a diffuser plate that diffuses the light from the laser light source before collimating the light.

A LiDAR system including a laser amplification system is disclosed. The laser amplification system includes a laser source and an optical amplifier. The laser source has a laser cavity and is configured to output electromagnetic radiation. The optical amplifier includes quantum dots and is positioned outside the laser cavity to receive the electromagnetic radiation output from the laser source. The optical amplifier amplifies the received electromagnetic radiation using the quantum dots and outputs the amplified electromagnetic radiation.