Blu-ray and HD DVD are similar in technology. Both use a blue laser to read the information on the disc.

蓝光影碟机和高清数字影碟机采用了相似的技术，都用蓝色雷射光读取影碟上的信息。

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The lasers most people are familiar with are the green dots highlighting a PowerPoint presentation or the blue (actually closer to violet) light found in Blu-ray technology.

大多数人所熟悉的激光器是在做PowerPoint演示文稿时所使用的有着高亮度绿色圆点或着蓝色(其实更接近紫色)的紫激光技术。

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There are other 3-d Blu-ray discs available, but they use the old blue-and-red glasses 3-d technology, which doesn't look nearly as good.

也有其他的3d蓝光光盘可用，但它们采用旧的红蓝眼镜三维技术，看起来不够好。

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They claim they wanted to be as far away from the name DVD as possible in order to distinguish themselves, but some say they choose blu instead of blue so they could copyright the name.

ENGADGET: The format war: What's in a name? HD

One of the metrics that is used to gauge the format war is Google trends and HD DVD is clearly ranked considerably higher, but if you add the common misspellings of both formats the chart looks different and it is clear to see that many people misspell Blu-ray as Blue-ray.

ENGADGET: The format war: What's in a name? HD

Current Blu-ray lasers emit light in the blue part of the electromagnetic spectrum (about 405 nm wavelength).

FORBES: What is the Future of Optical Disc Technology and who will Use It?