phthalocyanine Q switching

phthalocyanine Q switching

[¦thal·ō′sī·ə·nən ′kyü ‚swich·iŋ]
(optics)
Laser Q switching in which a solution of metal-organic compounds known as phthalocyanines is placed in a cell between an uncoated ruby laser crystal and a high-reflectivity mirror; when the incident ruby light reaches a certain level, the solution suddenly becomes almost perfectly transparent to this light, permitting the release of all the energy stored in the ruby as a giant pulse.