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Based on spatial-temporal symmetry breaking mechanism, we propose a novelscheme for terahertz (THz) wave generation from hyper-Raman lines associatedwith the 0th harmonic (a particular even harmonic) in a two-level quantumsystem driven by two-color laser fields. With the help of analysis ofquasi-energy, the frequency of THz wave can be tuned by changing the fieldamplitude of the driving laser. By optimizing the parameters of the laserfields, we are able to obtain arbitrary frequency radiation in the THz regimewith appreciable strength (as strong as the typical harmonics). Our proposalcan be realized in experiment in view of the recent experimental progress ofeven-harmonics generation by two-color laser fields.

Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers