Abstract
The Constrained variation technique is used to obtain third-order energy response property in Fock space multi-reference coupled cluster singles and doubles (FSMRCCSD) formalism. Computational development is done to calculate first static hyperpolarizability of lithium aluminum hydride (LiAlH4) at its lowest excited state. It is observed that LiAlH4 is not optically active at its ground state. But, it is highly active in its excited state. Using this property of LiAlH4, a new technique is described to generate mixed-frequency laser which is a laser of the new kind, reported here for the first time. This also helps to generate a laser with shorter pulse duration compared to the laser pulse duration used as incident radiation. Third-order energy response properties of excited states of a closed-shell molecule in analytical FSMRCC approach are also reported here for the first time.
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