Laser source and laser projector

Abstract

The present application discloses a laser source and a laser projector. The laser source includes a laser, a coupled focusing lens disposed in the optical path of a laser beam emitted by the laser, and a protective plate made of a thin metal plate. The protective plate is provided with a through hole at a position corresponding to the end face of a coupling fiber. The diameter of the through holeis between the diameter of a laser spot focused by the coupled focusing lens and the inner diameter of the cladding layer of the coupling fiber. The laser beam emitted by the laser is emitted to the coupled focusing lens, the coupled focusing lens focuses the incident laser beam, and the focused laser beam is emitted to the end face of the coupling fiber through the through hole on the protectiveplate.

Description

technical field [0001] The present application relates to the field of optical technology, and in particular, to a laser light source and a laser projector. Background technique [0002] The schematic diagram of the three-color laser projector is as follows figure 1 shown. Among them, the laser light emitted by the semiconductor lasers (blue DLP, green DLP and red DLP) enters the optical machine after beam expansion, shimming, decoherence, etc. The optical machine modulates the incident beam and outputs it to the projection lens, and finally in the Projected onto the screen to form a projected image. [0003] At present, for laser projectors, in order to achieve high brightness output, compact size and easy installation, an ultra-short focal design is usually adopted to achieve high brightness output of three-primary laser projection, which puts forward higher requirements for the heat dissipation of semiconductor lasers. requirements, especially for red semiconductor las...

AI Technical Summary

Problems solved by technology

Due to the large output power of visible light semiconductor lasers, and the end face of the coupling fiber is usually only on the order of hundreds of microns, the light receiving area is extremely limited, and the small position shift of the converging point of the incident beam by the coupling focusing lens will lead to high converging The high-power laser beam irradiates the cladding layer, which causes damage to the fiber cladding layer due to its low light resistance power density

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