OPTICAL PUMP SPECTROSCOPY

Optical pumping is a process in which light is used to raise (or “pump”) electrons from a lower energy level in an atom or molecule to a higher one. It is commonly used in laser construction, to pump the active laser medium so as to achieve population inversion.

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Figure : The time-resolved conductivity of isolated GaAs nanowires is investigated by optical-pump spectroscopy. Strong surface plasmon mode was observed due to charge trapping at the nanowire surface.

Reference: Oxford University TeraHertz group, Prof Johnston
https://www-thz.physics.ox.ac.uk/spectrometer/tds.html

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January 25, 2013 · 11:32 pm

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