Semiconductor Laser for Triple, Quadruple-layer Blu-ray Discs – Sharp


Sharp Corp developed a blue-violet semiconductor laser whose optical output is as high as 500mW under pulsed operation for use in Blu-ray Disc (BD) recorders.

It has an oscillation wavelength of 405nm and a capability of writing at 8x speed on triple- and quadruple-layer Blu-ray discs. The company started volume production of a blue-violet semiconductor laser with 320mW pulsed output in June 2009.

Sharp has not decided when to mass-produce the new blue-violet semiconductor laser because the specifications of triple or more layer Blu-ray disc have not been determined yet. However, the company claimed that it is now ready to commercialize the laser.

Sharp enhanced the optical output by using a new method of processing the edge face of a resonator. Normally, the edge face of a crystal in a semiconductor laser is protected by a dielectric film. This time, the company formed an aluminum oxynitride (AlON) film between the edge face of the semiconductor laser and the dielectric film by a sputtering method and realized an epitaxial growth where the growth axis of the laser’s crystal corresponds to that of the AlON crystal.

In the past, the crystal of a semiconductor laser was just covered by a noncrystalline dielectric film. Therefore, the edge face of the crystal had a surface state and absorbed laser light, and the crystal was degraded by the heat and stopped oscillation.

Sharp has already verified the reliability of the new blue-violet semiconductor laser. It confirmed that the laser operated for more than 1,000 hours under the temperature of 80┬░C with a pulse width of 30ns and an output of 500mW.


Monster Intros SuperThin Cables for HDMI

Without a doubt, Monster is one of the world’s best known manufacturers of various connectivity solutions and cables for home entertainment, the company’s products being famous for both their quality and, more importantly, their exaggerated prices. And it really looks like Monster’s done it again, since it’s just rolled out a new line of “Powered” SuperThin Cables for HDMI Cables ┬áspecifically designed for use with a wide variety of electronic devices.

As the cable manufacturer informs us, its new HDMI solution features a built-in LED indicator that instantly lets users know they are active and represents an alternative for use in aesthetically designed home theater installations utilizing flat-panel TVs. Consumers can literally hide the cables away in plain sight, as well as fit them into any tight corners for a new level of installation flexibility. Additionally, the compact and lightweight cables, which include handy cable ties, are ideal for taking on the road with camcorders or other mobile digital devices. Plus, for an enhanced level of reliability and performance, the cables feature corrosion-resistant 24k gold contacts.

Monster also points out that the key innovation that made the creation of Monster SuperThin Cables for HDMI possible is the RedMere MagnifEye Active technology, obtained following Monster’s partnership with RedMere. Requiring no external power supply, the technology enables high data speeds and quality performance by boosting the HD signals directly in the SuperThin cable itself, hence eliminating the need for heavy-gauge copper, making the cables extremely light, thin and portable. So, this is the reason why the SuperThin cables measure just 3.5 mm in diameter, approximately 65% thinner than normal HDMI cables.

As mentioned right from the start, Monster’s HDMI solutions are actually pretty expensive, since the Monster Super Thin Cable for HDMI products will be available in 4-, 8- and 16-foot versions in the DigitalLife line of products, selling for $89.95, $99.95 and $119.95, respectively. Moreover, Monster’s Core line of cables for HDMI will offer a SuperThin cable design in 1, 2, 4 and 5 meter lengths, which will sell for $79.95, $89.95, $99.95 and $119.95.

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