Two-Photon Light Shift in Optically Pumped FIR Lasers
We have made the first observation of a far-infrared two-photon light shift (2PLS). The 2PLS — an excess splitting of the gain peaks due to bidirectional pumping — is monitored by beating the output of two 15NH3 OPFIRL’s . The effect is related to, but distinct from that observed by BIALAS, FIRTH and TOSCHEK , and is described by the three-level system model of FELDMAN and FELD .
KeywordsGain Peak Pump Field Edinburgh Instrument Rate Equation Model Pump Component
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