"Ian Jackson" wrote in message
...
In message , ian field
writes
Anyone know the wavelength of the laser in a DVD player?

TIA.

http://www.howstuffworks.com/dvd6.htm

"A laser and a lens system to focus in on the bumps and read them - The
light from this laser has a smaller wavelength (640 nanometers) than the
light from the laser in a CD player (780 nanometers), which allows the DVD
laser to focus on the smaller DVD pits."


Orange?