You sure it was 940nm? From what I know 940nm is invisible to humans, and I have been able to see every CD player laser I’ve taken apart.
I AI’d it to check:
Disc Type Laser Color Wavelength CD (Compact Disc) Infrared ~780 nm DVD Red ~650 nm Blu-ray Blue-violet ~405 nm
You sure it was 940nm?
From what I know 940nm is invisible to humans, and I have been able to see every CD player laser I’ve taken apart.
I AI’d it to check:
Disc Type Laser Color Wavelength
CD (Compact Disc)
Infrared ~780 nm
DVD Red ~650 nm
Blu-ray Blue-violet ~405 nm