Figure | DQS mode-locked cavity enhanced second harmonic generation. (IMAGE)
Caption
Figure | DQS mode-locked cavity enhanced second harmonic generation. As the CW pump - corresponding to the fundamental field - accumulates in the cavity, the second-harmonic (SH) field power increases until it eventually saturates, at which point back-conversion occurs. This cycle of conversion and back-conversion initiates a series of cascaded quadratic nonlinear interactions, including SHG, sum frequency generation (SFG), difference frequency generation (DFG), and optical parametric generation (OPG) (top left). Collectively, these processes emulate an effective four-wave mixing interaction, providing the parametric gain and nonlinearity necessary for the spontaneous formation of self-localized DQS (top middle). Notably, in the doubly resonant cavity, the back-conversion can be triggered by pump phase detuning, even under perfect phase matching. Such phase-matched cascaded quadratic nonlinearities (PM-CQNs) enable more efficient nonlinear interactions and allow the effective nonlinearity to be readily controlled through pump phase detuning (top right).
Credit
Shu-Wei Huang et al.
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CC BY