A new type of blue-violet laser diode was created
A team of researchers from the University of California-Santa Barbara (UCSB), led by the legendary Shuji Nakamura, has created a new type of blue-violet laser diode. The novelty is said to be able to replace similar devices currently used in new generation optical drives.
Recall that for his discoveries in the field of LEDs, including the creation of a blue laser, Nakamura received last year the Millennium Technology Prize – an award equivalent to the Nobel Prize, and having the world’s largest prize pool. For the first time, the Millennium Prize was awarded two years earlier to the inventor of the Internet, Tim Berners-Lee.
New laser diode uses non-polar gallium nitride (GaN) semiconductor for the first time. Samples obtained at UCSB showed threshold current density no higher than 7.5 kA / sq.cm, distinct localization in the far zone and generation of coherent optical radiation with a wavelength of 405 nm in a pulsed mode. The use of a non-polar GaN semiconductor, according to scientists, makes it possible to reduce the threshold current compared to commercially available devices, which corresponds to a decrease in power consumption and an increase in the life of laser diodes.
The novelty can find numerous commercial applications, including high-density optical storage systems, optical sensors and medical devices. Because blue-violet diodes emit shorter wavelengths, they provide a higher density of data storage on optical media than their “red” predecessors used in CDs and DVDs.
Sources: EE Times, UCSB