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Technology Now

Introduction to Technological/Product Trends in Mitsubishi Electric High-frequency/Optical Devices

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3 : Short-wavelength Semiconductor Lasers for Optical Disc / Display

Since starting the production of semiconductor lasers for optical discs in 1980, Mitsubishi Electric has supported the development of optical recording devices, focusing on high-output units capable of high-speed writing to DVD discs. The company is also working towards the actualization of a high-output semiconductor laser to be applied as the light source for full-color movie projectors with superior color rendering properties. This is being achieved utilizing various innovative technologies including the edge window structure, edge coating and advanced crystal growth technology at the atomic level.

Fig. 3.1 Application fields for short-wavelength semiconductor lasers.

Fig. 3.2 Timeline of increasing output in short-wavelength semiconductor lasers.

Figure 3.3 shows the luminosity factor (brightness that the human eye can see) for wavelength dependency. Within the red region, even for light of the same strength, the shorter the wavelength is, the brighter it seems. But when the wavelength becomes too short, the color verges on orange. Mitsubishi Electric's semiconductor laser for projectors oscillates at a wavelength of 638nm, where both color rendering and brightness are achieved.

Fig. 3.3 Luminosity factor curve in the red region.

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