52.4: High Speed Green Frequency Converted Semiconductor Laser for Projection Displays

Steegmüller, U.; Kühnelt, M.; Singer, F.; Schwarz, Thomas; Albrecht, T.; Lutgen, S.; Reill, W.; Luft, J.; Brick, P.

doi:10.1889/1.2036320

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…Such analysis has been performed via modulating intracavity power using a mechanical chopper [206] and pulsed pumping [242]. In the former study, a fitting parameter was obtained for determining the gain dispersion, while the latter study was carried out in order to gain insight into the modulation dynamics of frequency-doubled VECSELs that are essential, for example, in projection applications [243][244][245]. Characterization of (intracavity) frequency-doubled VECSELs has also been performed by Hartke et al with a focus on 'green noise' [246,247], i.e.…”

Section: Gain Dynamics and Intensity Noisementioning

confidence: 99%

Optically pumped VECSELs: review of technology and progress

Guina

Rantamäki

Härkönen

2017

J. Phys. D: Appl. Phys.

205

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Section: Gain Dynamics and Intensity Noisementioning

confidence: 99%

Optically pumped VECSELs: review of technology and progress

Guina

Rantamäki

Härkönen

2017

J. Phys. D: Appl. Phys.

205

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“…The phase difference φ between the oscillations in horizontal and vertical direction is chosen such a way that the Lissajous figure is closed and symmetric as well as every point of the curve -except the knots -is only hit once by the laser beam (optimum phase difference). For Lissajous patterns with odd numbers for f x and f y the distance between neighboring knots equals to (2) with optimum phase shift φ = π/2 between both axis. For all other cases (even numbers for f x and/or f y ) the distance between two knots in the center is equal to…”

Section: Mathematical Analysismentioning

confidence: 99%

“…However, two key components -electrically analog modulated laser diodes for green color with high modulation frequencies and compact high-performance deflection units -were missing so far which is the reason why this kind of display has no market penetration yet. Both problems have been solved now: green lasers by several laser companies at least at prototype stage [2], miniaturized deflection units in terms of a special MOEMS device developed by Fraunhofer IPMS [3]: a two-dimensional resonant micro scanning mirror. First full color projection modules based on this device have been realized recently and will be described in this contribution.…”

Section: Introductionmentioning

confidence: 99%

Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

et al. 2006

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Projection systems comprising micromechanical scanning mirrors are a promising approach for information display of any kind. If combined with advanced laser diodes as light sources, ultra-compact projection heads can be realized, as it will be shown in this contribution. Besides the laser, key component of the system is a special MEMS device, a two-dimensional resonant micro scanning mirror. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. Advanced techniques that guarantee improved image quality and allow compensation of artifacts because of relative movement between projection head, screen, and human observer will be described. Based on these principles, several optoelectronic systems have been designed. A monochrome projection head that incorporates the laser diode, optics and the micro minor could be reduced to a volume of 15mm × 7 mm × 5mm. A slightly larger head is attached to a laser unit with red, green, and blue lasers via glass optical fiber for projection of full color images and video streams. All systems have VGA (640 × 480 pixels) resolution. They operate with 8 bit color depth per pixel and 50 frames per second. These key features in combination with the miniaturized size allow their use for a broad range of applications

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“…Since these two key components -electrically analog modulated laser diodes for green color with high modulation frequencies and compact high-performance deflection units -were missing so far, this kind of projection system cannot be found on the market currently. Both problems have been solved now: green lasers by several laser companies at least at prototype stage [2], miniaturized deflection units in terms of a special MOEMS device developed by Fraunhofer IPMS [3]: a two-dimensional resonant micro scanning mirror. In the meantime, the authors have realized full color projection modules that are smaller than the most compact commercial LED projectors.…”

Section: Introductionmentioning

confidence: 99%

Ultra compact laser projection systems based on two-dimensional resonant micro scanning mirrors

Scholles

Bräuer

Frommhagen

et al. 2007

MOEMS and Miniaturized Systems VI

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Recently, there has been substantial progress in the development of ultra-compact image projection systems with dimensions clearly below the size of products based on DMDTM technology. This has been enabled by the availability of electrically modulated laser sources for all three elementary colors and a two-dimensional resonant micro scanning mirror as MOEMS device for light deflection. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. In this contribution we will present the theoretical background of the projection system as well as the latest achievements in system design. Both monochrome and full color systems are currently available. The latter use a separate laser bank as RGB light source, which is coupled with the projection head comprising the micro-optics and the micro scanning mirror. For monochrome red systems, the laser diode can be integrated into the projection head as well, whose volume could be reduced to 15mm x 7 mm x 5mm. All systems have VGA (640 x 480 pixels) resolution and operate with 8 bit color depth per pixel and 50 frames per second. This degree of miniaturization makes laser projection systems attractive for integration into mobile devices and overcomes limitations of display size in such appliances

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52.4: High Speed Green Frequency Converted Semiconductor Laser for Projection Displays

Cited by 12 publications

References 6 publications

Optically pumped VECSELs: review of technology and progress

Optically pumped VECSELs: review of technology and progress

Design of miniaturized optoelectronic systems using resonant microscanning mirrors for projection of full-color images

Ultra compact laser projection systems based on two-dimensional resonant micro scanning mirrors

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