As it turns out CYAN (turquoise) is the complementary color of red. So, cyan absorbs red light. The Green Pen and some other devices including your humble narrator’s Codename Turquoise tray masking kit, absorbed stray CD laser light that was visible RED in color. And this was generally audible. However, things are not necessarily what they seem here.
The CD laser light nominal wavelength is actually 780 nm, which is in the invisible near-infrared portion of the electromagnetic spectrum. The reason the CD laser appears RED to the naked eye is by design - as a safety feature 🚨. The laser beam is not monochromatic so the wavelength of the lower portion of the laser bandwidth is between around 650 nm to 700 nm, I,e., RED. But most of the laser bandwidth is above 700 nm. Let’s say from 700 - 850 nm, for purposes of argument. So it is invisible. That means only 25% or so of the scattered light is affected (absorbed) by the color CYAN, and the Green Pen and Codename Turquoise. Therefore most (75%) of the scattered light is still potentially able to get into the photodetector. And no color, not even BLACK can absorb invisible infrared light. So, one might imagine how much better the sound might be if ALL of the scattered light could be absorbed.
The laser wavelength of Blu Ray is violet 405 nm.
extra: joke - Richard Feynman was pulled over by police for speeding. The cop asked him, do you know how fast you were going? Feynman replied, I’m uncertain.
The CD laser light nominal wavelength is actually 780 nm, which is in the invisible near-infrared portion of the electromagnetic spectrum. The reason the CD laser appears RED to the naked eye is by design - as a safety feature 🚨. The laser beam is not monochromatic so the wavelength of the lower portion of the laser bandwidth is between around 650 nm to 700 nm, I,e., RED. But most of the laser bandwidth is above 700 nm. Let’s say from 700 - 850 nm, for purposes of argument. So it is invisible. That means only 25% or so of the scattered light is affected (absorbed) by the color CYAN, and the Green Pen and Codename Turquoise. Therefore most (75%) of the scattered light is still potentially able to get into the photodetector. And no color, not even BLACK can absorb invisible infrared light. So, one might imagine how much better the sound might be if ALL of the scattered light could be absorbed.
The laser wavelength of Blu Ray is violet 405 nm.
extra: joke - Richard Feynman was pulled over by police for speeding. The cop asked him, do you know how fast you were going? Feynman replied, I’m uncertain.