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

Area of Science:

• Quantum Optics
• Nonlinear Optics
• Terahertz (THz) Science

Background:

• Spatial-temporal symmetry breaking is a key mechanism in nonlinear optics.
• Generating tunable terahertz (THz) radiation remains a significant challenge.
• Hyper-Raman lines in quantum systems offer potential for novel light generation.

Purpose of the Study:

• To propose a novel scheme for generating tunable THz waves.
• To explore THz generation from hyper-Raman lines in a two-level quantum system.
• To investigate the role of spatial-temporal symmetry breaking in this process.

Main Methods:

• Utilizing a two-level quantum system driven by two-color laser fields.
• Analyzing quasi-energy states to understand frequency tunability.
• Leveraging hyper-Raman lines associated with the 0th harmonic (an even harmonic).

Main Results:

• Demonstrated tunable THz wave generation by altering driving laser field amplitudes.
• Achieved THz radiation with appreciable strength, comparable to typical harmonics.
• Showcased the potential for arbitrary frequency radiation within the THz regime.

Conclusions:

• The proposed scheme offers a viable method for tunable THz wave generation.
• The approach is experimentally feasible, building on recent advancements in even-harmonic generation.
• This work opens new avenues for controlling and generating THz radiation.