Pumping Processes



We have seen in Chap. 1 that the process by which atoms are raised from level 1 to level 3 (for a three-level laser, Fig. 1.4a) or from level 0 to level 3 (for a four-level or a quasi-three-level laser, Fig. 1.4b) is called the pumping process. Usually it is performed in one of the following two ways: (i) Optically, i.e. by the cw or pulsed light emitted by a powerful lamp or by a laser beam. (ii) Electrically, i.e. by a cw, radio-frequency, or pulsed current flowing in a conductive medium such as an ionized gas or a semiconductor.


Pump Power Quantum Well Pump Beam Lower Laser Level Laser Level 
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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Dipto. FisicaPolitecnico di MilanoMilanoItaly

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