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More than fifty years after the first functional laser was invented, the blue lasers are the preferred type of lasers for data storage (the blue-ray disks). This is mainly due to their relatively short wavelengths, which means that in case of imaging applications and data storage, they allow for a greater amount of information to be written and read. Also, the short wavelength allows for the strong focusing of laser beam and a very fine structure of the written data.
Blue laser has mostly replaced the use of red laser in the area of data storage. At the beginning, the first types of blue lasers had many disadvantages. Initially, they were only gas lasers, which needed high currents and produced a huge amount of heat, therefore needing strong cooling.
After that, the first types of semiconductor blue lasers (or blue laser diodes) had a very short life (several hundred hours at the most), even if they worked at a very low temperature (needing almost absolute zero values - 00K - to work properly). But further development solved all these issues.
While the red and infrared lasers are usually based on GaAs (gallium arsenide), in case of blue lasers, the InGaN (indium gallium nitride, which has a violet color) and GaN (gallium nitride, which has a true-blue color) based ones are preferred .
The ZnSe (zinc selenide) based laser was gradually excluded from research, because of its high resistivity, high energy consumption and very small efficiency. The most efficient technology of building blue-lasers is using InGaN quantum wells to form the active medium.
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Is Blu-ray Disk is optical disk?
Yes, a Blu-Ray device is an optical reader. CD's, DVD's, and Blu-Rays are called Optical Devices because the reader looks at the disks using light. The light is a laser. Just like a DVD, a Blu-Ray uses a laser beam to light up and read the information on the disk. This is like an old record needle running along a record groove and reading the information. However, the laser used by CD's, DVD's and Blu-Rays does not touch the disk. It just lights it up. The difference between DVD's and Blu-Rays is the colour of laser. DVD's use a red laser light, Blu-Rays use one that is blue. Different coloured laser beams read different sizes. Writing and reading on a DVD with a red laser beam is like using a crayon, a blue beam is like a sharp pencil. The Blu-Ray is an optical device, just like a DVD, but because it uses a "finer pencil" it can put more information onto the disk.
Is the Blu-Ray disc a magnetic disc storage media?
No, Blu-Ray is an optical disk storage media, similar in operation to DVD and CD media.The difference is that Blu-Ray has much higher capacity because it uses a blue LASER instead of the red LASER used for DVD and CD. The blue light can resolve smaller features than red light can, so the pits can be made smaller and closer together.
How can Blu-ray discs hold more information?
The "Blu" in blu-ray refers to a short-wave blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.
What is Blu-ray tech give the brief description?
Blu-ray technology is a new format that uses a blue-violet laser. The old technology used a red laser instead. Blu-ray technology can store five times the data as older products.
What is the difference between red label and blue label whiskey?
red lebel - 3-5 year old, blu - near 50 yeas old
What type or color laser used in a CD drive?
I would expect red unless it is a blu-ray (that is blue)
What is the difference between a red dot sight and a laser sight?
The difference is that red-dot sights have contained aiming reticles, whereas laser sights use an emitted laser beam that must fall onto a target. Red-dot sights are used mainly for more accurate ADS (aiming down sight) firing and laser sights allow for less-accurate, but made more so, shoulder-firing.
Why do many laser pointers produce a red light?
Because the red ruby laser is the cheapest. Green lasers are usually more expensive. And the blue lasers found in blu-ray players are even more expensive.
Why aren't DVD players able to read Blu-ray discs?
DVD players use a red laser to read its media, while blu-ray discs are 'burned' using a blue laser. Because of the difference in wavelength, (blue light has a shorter wavelength than red light) there is a difference in frequency, and therefore DVD players cannot read blue-ray discs. However, it seems that newer models of Blu-Ray players are 'backwards compatible' meaning that they are able to play Blu-Ray discs as well as older versions of the CD (compact disc). My theory for this capability comes from an 'optical head device.' This device has the capability of focusing light, thereby changing the wavelength and frequency and color of the laser emitted all at the same time.
What is Blu-ray all about?
Blu-ray or Blu-ray Disc, BD using a shorter wavelength (405nm), blue laser to read and write data, hence the name. Traditional DVD bald issued a red laser (wavelength 650nm) to read or write data, usually the wavelength, the shorter the laser can record or read more information on the unit area. Therefore, the Blu-ray to the storage capacity of CD-ROM, optical storage products, Blu-ray provides the opportunity to develop a jump.
What waves are used in DVD players?
Light waves.A DVD player uses a red (long wave) laser, and a blu-ray player uses a blue (short wave) laser.
Why is Blu-ray called so?
Traditional DVDs and CDs use a red laser to be read. Blu-Ray discs use a blue-violet laser. Blue light has a shorter wavelength than red light, meaning it can bounce back faster from the disc than red, and hence transmit more data in the same time period.
