Abstract
The paper discusses the proposal for a maser which would provide an emission frequency somewhat higher than the pumping frequency. Basically, this is a mixture of a three-level maser and a two-quantum maser. Four cases of such a maser in three- and four-level systems are analyzed and the probability for the two-photon process is derived using perturbation theory. It follows from a discussion of the theoretical dependences that this type of maser has the greatest hope for realization in gases on electric dipole transitions.
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In conclusion the author would like to thank V. PetŘíček for remarks and discussing this problem.
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Odehnal, M. Proposal for maser with emission frequency higher than pumping frequency. Czech J Phys 13, 8–13 (1963). https://doi.org/10.1007/BF01689074
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DOI: https://doi.org/10.1007/BF01689074