15 May 1981 Two-Photon Amplification On Cascade Transitions
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Proceedings Volume 0236, 1980 European Conf on Optical Systems and Applications; (1981) https://doi.org/10.1117/12.958975
Event: 1980 European Conference on Optical Systems and Applications, 1980, Utrecht, Netherlands
In a 3-level system with a cascade configuration of the energy levels the process of stimulated 2-photon emission produces anisotropy and asymmetry of the amplification or absorption lineshape. In order to analyse the possibility of a tunable 2-photon laser, some properties of He-Ne cascade lasers were investigated theoretically and experimentally. The cascade oscillates simultaneously on the 3s2-3p4 transition at 3.4 μm and on the 3p4-2s2 transition at 2.4 μm. The amplification anisotropy was observed in a unidirectional ring laser, giving the first proof of strong field 2-photon gain from a continuous incoherently produced population inversion. The amplification asymmetry was measured in a standing wave laser and was used to tune the laser beyond the limits nredicted by single-photon theory. The experiments indicate the possibility of extending the tuning range into the region of "pure" 2-photon oscillation.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Harry Schlemmer, Hans Harry Schlemmer, Dieter Frolich, Dieter Frolich, Herbert Welling, Herbert Welling, } "Two-Photon Amplification On Cascade Transitions", Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); doi: 10.1117/12.958975; https://doi.org/10.1117/12.958975

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