Optical instruments
type: Concept
narrower: Lasers

Lasers
type: Concept
created: 2005-02-01T00:00:00.000Z
modified: 2009-07-16T00:00:00.000Z
broader: Optical instruments
change note: 5.3 - BT Light removed, BT Optical instruments added.
related: Photons

Photons
type: Concept
preferred label: 光子 @zh
related: Lasers