640-nm laser diode for small laser display

Shimada, N.; Yukawa, M.; Shibata, K.; Ono, K.; Yagi, T.; Shima, Akihiro

doi:10.1117/12.808710

Cited by 22 publications

(12 citation statements)

References 9 publications

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“…Even when the operation takes place at room temperature, an increase in the T c by 10 C causes the light output to drop by about 20% at 0.4 A. Sufficient light output does not result with the T c exceeding 70 C. Figure 2 shows the results of measuring the wavelength for each T c .…”

Section: Temperature Characteristics Of Red Ld and Cyan Ledmentioning

confidence: 95%

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Paper No 9.4: Heat Dissipation Performance of Laser Backlight for Liquid Crystal Television Displays

Nagase

Niikura

Shinozaki

et al. 2013

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The authors have developed the laser backlight for displays that uses laser diodes (LDs) for the red light sources. While laser beams are favorable because of their high color purity, they develop extremely disadvantageous thermal characteristics. Therefore, thermal management is a critical issue for LDs used as display light sources. As for the backlight used on a large screen flat panel display in particular, where light sources with high heat flux are laid out in a dispersed fashion, the cooling performance of the light sources directly influences the product performance and quality. The authors used a CFD simulation to review a cooling system optimum for the laser backlight.

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Section: Temperature Characteristics Of Red Ld and Cyan Ledmentioning

confidence: 95%

“…The WPE of the red LD is about 30% when the T c is 25 C and the light output is 0.2 W [10]. Since the WPE lowers as the element temperature rises, the authors consider that the average WPE is 25% over the range of operating temperatures, for example.…”

Section: Estimation Of a Heat Value Of The Light Sourcesmentioning

confidence: 98%

Paper No 9.4: Heat Dissipation Performance of Laser Backlight for Liquid Crystal Television Displays

Nagase

Niikura

Shinozaki

et al. 2013

Symp Digest of Tech Papers

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“…After the epitaxial growth, a GaAs contact layer is etched off and a SiN insulator is deposited at outside of the broad stripe active area for selective current injection. The stripe width is 40 μm, the same as our 638 nm LD described in references 4,9,12,13 . After forming p-side and n-side electrodes, the wafer is cleaved for cavity length of 1500 μm.…”

Section: Laser Diode Chip Designmentioning

confidence: 99%

Short wavelength limitation in high power AlGaInP laser diodes

et al. 2011

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In wavelength region of red color, luminous efficacy rapidly increases as wavelength shortens. In that sense, red laser diode (LD) with shorter wavelength is required for display applications. Experimental results for short wavelength limitation in AlGaInP LDs are shown and discussed in this paper. Broad area LDs with 625, 630, and 638 nm are successfully fabricated. Operation current versus output power (P-I) characteristics and its temperature dependence of 625 nm LD are inferior to that of 630 and 638 nm ones. The main reason might be carrier leakage, and the results indicate that additional countermeasures to carrier leakage should be adopted to realize a 625 nm LD with the same temperature characteristics as 630 and 638 nm LDs. Conversion efficiencies from input electrical power to luminous flux output of the LDs are also studied. 625 nm LD has low efficiency, though brightness of 625 nm light is 1.7 times of 638nm one with the same output power. And 630 nm LD shows better conversion efficiency at high luminous flux region than 638 nm one, though the P-I characteristics of 630 nm is worse than that of 638 nm one. The tendency is inverted at low flux region, indicating that the lasing wavelength of red LD for laser display should be chosen carefully.

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“…The limitation for RW lasers is the catastrophically optical mirror damage (COMD) [11], where the facet of the laser melts due to the high optical power density. While significant progress has been made to increase the COMD threshold, current state-of-the-art red-emitting RW diode lasers do not exceed 200 mW in optical output power [12,13].…”

Section: Introductionmentioning

confidence: 99%

High luminance tapered diode lasers for flying-spot display applications

et al. 2012

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Flying-spot display applications require high luminance (> 100 TCd/m²) red-emitting lasers. High luminance is defined as a high optical output power and a nearly diffraction limited beam quality at a wavelength with a good visibility of the human eye. Diode lasers, with all their beneficial properties such as direct modulation capability, small size and good electro-optical efficiency, are so far unable to achieve such high luminance, due to catastrophic optical mirror damage (COMD) caused by high facet loads.We will present tapered diode lasers emitting near 635 nm with a larger vertical waveguide to lower the facet load and to alleviate the COMD risk. The lateral structure consists of an index-guided ridge waveguide section for lateral mode filtering, and a gain-guided tapered section for the amplification of radiation and a further reduction of the facet load. The tapered lasers are mounted p-side down on diamond heat spreaders and on copper heat sinks.We achieved an optical output power of 1.1 W at 636 nm at a laser temperature of 5°C. The emitted beam has a nearly diffraction limited (M 2 1/e² < 2) central lobe with a high power content (P CL > 75%). At 636 nm the eye sensitivity is 142 lm/W according to the CIE 1931 photopic eye response curve (v λ ). Hence, we achieved a luminous flux of > 100 lm and a luminosity of 150 TCd/m², thus taking a first step towards diode-laser-based flying-spot displays.

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640-nm laser diode for small laser display

Cited by 22 publications

References 9 publications

Paper No 9.4: Heat Dissipation Performance of Laser Backlight for Liquid Crystal Television Displays

Paper No 9.4: Heat Dissipation Performance of Laser Backlight for Liquid Crystal Television Displays

Short wavelength limitation in high power AlGaInP laser diodes

High luminance tapered diode lasers for flying-spot display applications

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