US Patent 8189636 - Electrical overstress indicator using nanocrystal coating
Finisar Corporation is a global technology leader in optical communication components and subsystems. This patent from Finisar teaches how nanocrystals can be used to visibly indicate electrical stress in lasers. Claim 1 reads:
1. A laser comprising:
an active area;
a metal contact region in electrical communication with the active area; and
a coating on the contact region configured to manifest a change in a visual attribute of the coating in response to exposure of the contact region to an electrical overstress event,
wherein the coating includes nano-crystals that are configured to change direction such that the nano-crystals are substantially oriented along a discharge path of the electrical overstress event such that this change of orientation results in a change of color.
Labels: Finisar Corporation