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Method and apparatus for reducing optical signal speckle

A technology of optical signals and light spots, applied in optics, optical components, lasers, etc., can solve problems such as increased complexity, cost, size and energy consumption, small effect, lack of solutions, etc.

Inactive Publication Date: 2010-12-08
MANDERBÜHNE TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While these methods can slightly reduce speckle, these methods lack a reasonable solution
One such disadvantage is that these prior art solutions are minimally effective
Another disadvantage is the added complexity, cost, size and power consumption

Method used

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  • Method and apparatus for reducing optical signal speckle
  • Method and apparatus for reducing optical signal speckle
  • Method and apparatus for reducing optical signal speckle

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Embodiment Construction

[0043] The term optical signal generator as used herein is defined as virtually any device, element or structure that emits light. These may include, but are not limited to, lasers, light emitting diodes, liquid crystal displays, laser diodes, gas lasers, color center lasers, solid state lasers, or any other light source that suffers from speckle or other image degradation due to light interference. The term light as used herein may include any type of light or wavelength of light including, but not limited to, near infrared, far infrared, visible spectrum, or ultraviolet light. The term interference refers to the breadth of the luminescence spectrum of the light energy under consideration. Width is usually measured by the range of wavelengths over which the emitted power falls below half the peak power. For projector applications, emission widths of 1 nm or less are considered "interference". Different applications may consider different spectral widths to be interference. ...

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PUM

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Abstract

An optical signal generator is configured with an associated control system and driver configured to reduce speckle. Speckle reduction occurs by pulsing the drive signal between a first current level and a second current level. These pulses force the optical signal generator to introduce oscillations into the optical signal. The coherence of the emitted light is reduced during the period of oscillations in the optical signal, which reduces speckle. In one embodiment, the pulsing of the drive signal brings the drive signal down to a level near or below threshold, which in turn intermittently turns off the optical signal output. Returning the optical signal to a desired optical output intensity introduces the speckle reducing oscillation. The pulse frequency, and duty cycle is controlled by a duty cycle control signal to modulate overall optical power and adjust amount of despeckle.

Description

[0001] priority [0002] This application claims the benefit of and priority to U.S. Application 12 / 218,623, filed July 15, 2008, which claims U.S. Provisional Priority of application 61 / 019,197. technical field [0003] The present invention relates to an optical signal generator, in particular to a method and equipment for reducing light spots in the output light of the optical signal generator. Background technique [0004] Spotting (black areas of surfaces with bright spots of light from a laser or other coherent light source) is a significant problem in many applications where a laser or combination of lasers is used as a light source. One such application is laser projection. In laser projection applications, lasers (usually 3: red, green, and blue) are used as the light source for projecting images. Various systems utilize these light sources to "scan" the image by adjusting the emitted light on a pixel-by-pixel basis, or the laser is held at maximum intensity whil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/02H01S3/00
CPCH04N9/3161H01S5/042H01S5/06246H01S5/06209G02B27/48G02B26/10H04N5/74H01S5/06216H01S5/0652H04N9/3129
Inventor C·巴扎尼D·德雷珀K·B·麦克唐纳
Owner MANDERBÜHNE TECH GMBH
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