Machina Dynamica New Dark Matter CD and Blu Ray tray treatment?

Peter Belt passed away almost two years to the day at the age of 87. Both Peter and May are the nicest most generous people you ever want to meet. There is one thing though, they are quite confident and not at all shy when arguing sound and audio.  Peter Belt was more like Michael Green than one would imagine since before he got involved with things that go bump in the hight he was a designer in the high end audio industry in UK, in particular ortho something speakers. They were both most generous in allowing me to use their ideas many times. I am probably their biggest fan, in fact I’m quite sure of that. There’s a whole other world, waiting out there. A world perhaps best suited to the more adventurous audiophile. 😛 The last time I looked Peter Belt’s Cream Electret and Silver Rainbow Foils were on Stereophile’s Recommended Components.

Yeah ten thousand dollars, go have some fun
Put it all on at a hundred to one
Hang fire, hang fire, hang fire, put it on the wire, baby
Doo doo
Doo doo, hang fire, hang fire put it on the wire
Hang fire, hang fire, hang fire, hang fire
Put it on the wire, baby
Put it on the wire

Head count complete. Sigh of relief.

CD diode lasers are about 780 nm which is in the infrared and is not visible. Our vision falls off greater than about 633 nm or so. Cheaper, more recently developed 405 nm diode lasers in the violet allowed development of blueray. DVD is 650 nm or visible red. The shorter the wavelength, the more data you can fit onto a disc because the features can be made smaller.

That’s very good, stevecham. But why is the sky blue? If our vision falls off after 625 nm how can 650 nm be visible red? 

Pop quiz: what color is a Blu Ray laser?

part 2: what’s the complementary (absorbing) color for the Blu Ray laser scattered light?