Abstract-From near IR to terahertz stimulated photon emission in the LaF3 crystals heavily doped by Nd3+; the use of the Dicke and the Purcell effects

• V.V. Hizhnyakov^a, 
• Yu.V. Orlovskii^a, b, , 

• ^a Institute of Physics, University of Tartu, W. Ostwaldi st. 1, 50411 Tartu, Estonia
• ^b A.M. Prokhorov General Physics Institute, 38 Vavilov st., 119991, Moscow, Russia
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• http://www.sciencedirect.com/science/article/pii/S0022231316306639

We discuss the novel idea for direct terahertz pulse emission stimulated by Purcell and Dicke effects simultaneously in the Nd³⁺ heavily doped LaF₃ crystals after femtosecond near IR laser excitation with high power density as a result of transitions between crystal-field (Stark) levels of the Nd³⁺ manifolds of the appropriate energy.