2012
DOI: 10.1364/ao.51.003584
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Demonstration of a home projector based on RGB semiconductor lasers

Abstract: In this paper, we demonstrate a high-definition 3-liquid-crystal-on-silicon (3-LCOS) home cinema projection system based on RGB laser source modules. Both red and blue laser modules are composed of an array of laser diodes, and the green laser is based on an optically pumped semiconductor laser. The illumination engine is designed to realize high energy efficiency, uniform illumination, and suppression of speckle noise. The presented laser projection system producing 1362 lm D65 light has a volume of about 450… Show more

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Cited by 38 publications
(16 citation statements)
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“…This phenomenon can be reduced by destroying the degree of temporal coherence or spatial coherence. There are some well-known methods for this such as using a LASER array [2], moving screen [3], scanning micromirrors [4], rotating diffuser [5], vibrating diffractive optical elements [6], vibrating volume phase holographic beam shaper [7,8], rotating light pipe [9], stimulated-Ramanscattering (SRS) in the optical fiber [10], or vibrating multimode optical fiber bundle [11]. The above methods can reduce the speckle contrast value to an invisible level, but the size or system weight are still too large for pico-projector applications.…”
Section: Introductionmentioning
confidence: 99%
“…This phenomenon can be reduced by destroying the degree of temporal coherence or spatial coherence. There are some well-known methods for this such as using a LASER array [2], moving screen [3], scanning micromirrors [4], rotating diffuser [5], vibrating diffractive optical elements [6], vibrating volume phase holographic beam shaper [7,8], rotating light pipe [9], stimulated-Ramanscattering (SRS) in the optical fiber [10], or vibrating multimode optical fiber bundle [11]. The above methods can reduce the speckle contrast value to an invisible level, but the size or system weight are still too large for pico-projector applications.…”
Section: Introductionmentioning
confidence: 99%
“…Theoretical estimation has shown that for full speckle suppression for a screen with a roughness height of approximately 50 μm, the spectral bandwidth should be at least Δλ > 50 nm. The time coherence of the laser beam can be reduced by using several lasers [5][6][7] or by using a broadband laser [8]. For speckle averaging using several lasers with equal light intensity and with wavelength differences sufficient to create different speckle patterns (the best case for speckle suppression), the speckle contrast can be decreased at most to a level of [2] C C 0 N p ;…”
Section: Introductionmentioning
confidence: 99%
“…One example is to use a rotating ground glass diffuser (RGGD) that creates a time-varying speckle pattern, which when averaged over a sum of N independent patterns results in the smearing out of the effects of speckle. [4][5][6][7] Other techniques for reducing the speckle contrast parameter include the use of a rotating rectangular light pipe, 8 a vibrating diffractive beam shaper 9 and fast scanning micromirrors. 10 These methods all achieve a reduction in speckle contrast to C ¼ 0:04 À 0:075, but typically at the cost of additional bulky mechanical parts or expensive components, making them unsuitable or undesirable for applications that require a compact and vibration-free solution such as laser-based picoprojectors, for example.…”
mentioning
confidence: 99%