A laser light source depolarizer includes a laser light source, a light angle adjusting element, a birefringent crystal, and an integration rod. The laser light source is configured to emit a laser light. The light angle adjusting element is configured to change the diffusion angle of the laser light. The light angle adjusting element is disposed between the laser light source and the birefringent crystal. The birefringent crystal is disposed between the light angle adjusting element and the integration rod, and the birefringent crystal is configured to break the polarity of the laser light.

An image projector with a high optical efficiency projects an image at an arbitrary distance from an observer. The image projector includes an illumination module having at least one spatially coherent light source; a phase image generator with an array of optical phase shifting elements; an electronic image controller connected electrically to the phase image generator; and a waveguide which includes at least one embedded partial reflector. The waveguide may be positioned either between the illumination module and the waveguide, or between the waveguide and the observer. The phase image generator may include phase shifts for canceling speckle, correcting optical aberrations, and/or compensating interference caused by light rays having different optical path lengths.

An illumination device according to the present disclosure includes: a first light source that outputs first illumination light subjected to phase modulation to have desired intensity distribution; a second light source that outputs second illumination light; an integrator optical system that uniformizes intensity distribution of the second illumination light; a polarization conversion element that aligns polarization directions of incident light in one polarization direction; and a reflection element disposed on an optical path between the integrator optical system and the polarization conversion element, the reflection element multiplexing the first illumination light and the second illumination light and causing each of the first illumination light and the second illumination light to enter the polarization conversion element.

A laser projection apparatus includes a laser source assembly, an optical engine and a projection lens. The laser source assembly includes a laser device and a combining lens group. The laser device includes a first laser-exit region emitting laser beams of first color, a second laser-exit region emitting laser beams of second color, and a third laser-exit region emitting laser beams of third color. The combining lens group includes a plurality of combining lenses and a beam spot adjustment structure. The beam spot adjustment structure is disposed in beam paths of the laser beams of first color and the laser beams of second color before being combined with the laser beams of third color, and the beam spot adjustment structure is configured to increase a divergence angle of at least one of the laser beams of first color or the laser beams of second color.

A laser device is provided. The laser device includes a case, a plurality of light-emitting assemblies, an upper cover assembly and a stress-offsetting structure. The case includes a bottom plate and a frame body. The frame body is disposed on the bottom plate, and is enclosed on the bottom plate to form an accommodating space with an opening. The plurality of light-emitting assemblies is located in the accommodating space and are disposed on the bottom plate. The upper cover assembly is fixed to the case and covers the opening. The stress-offsetting structure is disposed in the frame body and/or in the upper cover assembly, and is configured to be contracted in a squeezing direction when the stress-offsetting structure is squeezed.

An optical device includes an array of light-emitting elements, including a first subset of light-emitting elements and a second subset of light-emitting elements. The first subset of light-emitting elements is configured to emit light having wavelength L.sub.1. The device includes a high refractive index material selectively disposed on the second subset of light-emitting elements and an array of optical elements positioned so as to be illuminated by the first subset of light-emitting elements and by the second subset of light-emitting elements. The optical elements are regularly arranged in a common plane at a pitch P, the common plane is located a distance D from the array of light-emitting elements, and P.sup.2≈2L.sub.1D/N, N being an integer greater than or equal to 1.

A light source module, which includes a heat sink, a laser assembly, a circuit board assembly, a conductive material, and multiple lock members, is provided. The circuit board assembly includes a circuit board, which has an accommodating opening that corresponds to a beam emitter of the laser assembly. The lock members respectively pass through third lock holes of the circuit board assembly, second lock holes of the laser assembly, and first lock holes of the heat sink in sequence, thereby locking the circuit board assembly and the laser assembly on the heat sink. The accommodating opening of the circuit board exposes the beam emitter, and the conductive material connects two conductive pads of the laser assembly to two corresponding electroplated through holes, thereby enabling the laser assembly to be electrically connected to the circuit board assembly. A projector including the light source module is also provided.

A venous positioning projector includes an infrared light source module, a light splitting element, an infrared light image capture module, a processor, and a visible light projection module. The infrared light source module outputs a first infrared light to a target surface. The infrared light image capture module includes a filter and an infrared light image capture element. The light splitting element transmits a second infrared light reflected by the target surface to the filter. The infrared light image capture element receives the second infrared light passing through the filter. The processor generates venous image data according to the first infrared light and the second infrared light received by the infrared light image capture element. The visible light projection module generates a visible light based on the venous image data. The visible light is transmitted to the target surface through the light splitting element to generate a venous image.

A handheld, battery powered projection device for projecting a traffic command image onto a road surface. The projection device uses a laser light source to project the traffic command image. The projection device includes a twist actuator for selecting from a plurality of projectable traffic command images.

An imaging system includes at least one laser light source having a wavelength in the visible spectral range and a beam guidance element with high solarization resistance at high beam power densities. The invention also relates to the use of the imaging system, in particularly in projectors and in material processing.