Method for expanding laser output linewidth

A technology of lasers and output lines, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of bulky and high cost, and achieve the effect of small size, low cost, and suppression of speckle effect

Inactive Publication Date: 2008-11-05
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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Problems solved by technology

Although this invention can eliminate the speckle formed by laser interference, collimating and converging elements, beam concentrators, shimming and shaping devices, etc. need to be installed outside the laser cavity. The volume of the device used to eliminate speckle is relatively large and the cost is high.

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  • Method for expanding laser output linewidth
  • Method for expanding laser output linewidth
  • Method for expanding laser output linewidth

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Embodiment Construction

[0017] Extending the laser output linewidth is a very effective method to reduce the speckle effect. According to the principle of laser, the laser output linewidth is determined by the half maximum width of the laser gain, and the half maximum width of the laser gain, that is, the laser gain bandwidth, is an inherent characteristic of the laser gain medium, so the laser linewidth of ordinary lasers, especially continuous lasers, is a fixed value. Usually, the linewidth of semiconductor-pumped intracavity frequency-doubling laser is very narrow, often only 1nm, or even 0.1nm. In order to reduce the speckle effect, it is necessary to expand the output linewidth of the laser.

[0018] The present invention introduces a loss element in the laser cavity that varies with the wavelength of the laser gain center region, and the loss curve generated in the laser cavity is superimposed and compounded with the laser medium gain curve, so that the laser gain center region in the laser cav...

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Abstract

A method for expanding the output linewidth of the laser, used in the technical field of the laser display, includes the following steps: introducing a loss element changing along the wavelength of the laser gain area in the laser cavity, overlapping and compounding the loss curve and the laser medium gain curve in the laser cavity, to cause the laser gain central area with larger cavity loss in the laser cavity, thereby causing the laser wavelength with lower gain in the laser gain bandwidth to obtain the chance of the oscillation starting, consequently widening the output bandwidth of the whole laser. The method of the invention is not only used in the semiconductor pumping intracavity frequency double laser and the fundamental wave output laser in the embodiment, but also is used in the RGB laser of the laser display, which effectively restrains the speckle effect. In addition, the laser has small volume and low cost.

Description

technical field [0001] The invention relates to a method for extending the output line width of a laser, which can be used for laser display. Background technique [0002] As we all know, laser has good monochromaticity, strong directionality and high coherence. In terms of laser display, the high coherence of laser will produce speckle effect, which will degrade the display image quality and seriously affect the visual effect. An invention patent application specification with document number CN101063519A discloses an illumination system for eliminating speckle with a laser array fiber coupling structure. The lighting system includes: a plurality of lasers emitting laser beams; a collimating element and a converging element are placed perpendicular to the laser emitting direction at the front end of each laser light outlet; a beam concentrator, the light outlet of each converging element is connected to the The entrance optical connection of the beam cluster is used to bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/106H01S3/10H01S3/00
Inventor 吴砺凌吉武彭永进马英俊
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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