05-06-2022, 12:29 AM
CD, DVD, BluRay, et al are derived from LaserDisc technology.
Unfortunately, some LaserDisc pressings from a particular plant in Indiana were made with a defective binder, which caused a chemical reaction commonly referred to as "laser rot," resulting in severe loss (and eventual total loss) of information.
Phun Phacts about LEDs and Laser Diodes
Why were there only red LEDs up until the 1980s?
Why were green and amber LEDs introduced over a decade after red ones?
Why did blue LEDs and BluRay not appear until the 1990s?
A lot of people assume an LED is a white light with a colored plastic lens over it.
Not true. An LED or laser diode emits the exact color of light observed. The color depends on the size of a tiny resonant cavity in the semiconductor device. Red devices appeared first because the longer wavelength of red light could be emitted by a relatively large cavity. Other colors appeared as a result of the same miniaturization process that enables putting more and more transistors on a chip.
Unfortunately, some LaserDisc pressings from a particular plant in Indiana were made with a defective binder, which caused a chemical reaction commonly referred to as "laser rot," resulting in severe loss (and eventual total loss) of information.
Phun Phacts about LEDs and Laser Diodes
Why were there only red LEDs up until the 1980s?
Why were green and amber LEDs introduced over a decade after red ones?
Why did blue LEDs and BluRay not appear until the 1990s?
A lot of people assume an LED is a white light with a colored plastic lens over it.
Not true. An LED or laser diode emits the exact color of light observed. The color depends on the size of a tiny resonant cavity in the semiconductor device. Red devices appeared first because the longer wavelength of red light could be emitted by a relatively large cavity. Other colors appeared as a result of the same miniaturization process that enables putting more and more transistors on a chip.
