What is a blue laser diode?
Blue laser diode is a type of semiconductor laser that produces a concentrated beam of photons with wavelengths of about 400 to 500 nanometers - an area of visible electromagnetic spectrum perceived as a blue or purple human eye. Blue laser diodes are more difficult than many other types of laser, especially at higher power levels, but the short wavelength of blue light allows greater accuracy. Blue laser diodes are now used for applications such as laser indicators and video projectors, as well as devices using high-resolution optical discs, most prominently Blu-ray format.
Like all laser diodes, blue laser diode light produces energy pumping into the semiconductor. In laser diodes, this is done with electric current, which distinguishes them from optically pumped semiconductor lasers that use light. This causes electrons in the semiconductor material to rise briefly at the energy level. When electrons return to theirThe original energy level is released again lost energy like photons and produces light. The light is then collimated with a laser lens and focuses the photons produced in one direction to form a concentrated beam of light.
The color of the laser light depends on the wavelength of the photon, which depends on the properties of atoms or molecules containing the medium. The most common material for profit for the blue laser diode is the nitride Gallia (Gan), a crystalline semiconductor. India (Inn) nitride, as well as nitride Gallia, is also used.
Blue laser diode is the basis for several optical data formats such as Blu-ray, China Blue Highfinition and HD DVD. All optical drives such as CD and DVD store information about the model of microscopic indentations that are read by the laser when the disk turns inside the disk player. CD and DVDS USAE Lasers that produce red light that has a longer waveletlength than blue light and therefore requires a wider indentation on the disk to read it correctly. The shorter blue light wavelength allows the blue laser to exactly read the smaller features on the disk, which means more indentation, and therefore more data can be included on the same size. This allows the disk designed to read a blue laser diode to fit about 25 gigabytes of data into one disk layer, more than five times higher than the DVD capacity.
Blue laser diode is a relatively recent innovation and until 2001 has not achieved commercial use. It was difficult to create a suitable profit medium and progress in the science of the materials needed before technology would become viable. It was mainly a product of research conducted in Poland and Japan, most prominently Dr. SHIA NAKAMUR, Japanese engineer and researcher, and Dr. Sylwester Porowski from the Polish Academy Sciences.