Higher-order dispersion and the spectral behavior in a doubly resonant optical parametric oscillator

Abstract

In doubly resonant optical parametric oscillators (DROPOs), it is possible to generate, enhance, and phase lock two frequencies at once. Following intracavity phase conditions, a complex tuning behavior of the signal and idler spectra takes place in DROPOs, cumulating into degeneracy with phase self-locking and coherent wavelength doubling. In this work, we identify group delay matching as the important parameter determining the global tuning behavior and demonstrate the key role of higher-order dispersion in the spectral dependencies. Applicationwise, we suggest a simple way to control the phase self-locking region by varying the intracavity third-order dispersion.

Terahertz radiation in tailored two-color laser fields with a stabilized doubly resonant optical parametric oscillator

“…For the optimum performance of the stabilization, a large self-locked region of the spectrum is beneficial. Here we show that the phase locking region can be significantly extended by introducing high-order dispersion (TOD) into the cavity [4]. As shown in Fig.…”

Monolithically-integrated femtosecond optical parametric oscillators

“…Sweeping T RT , therefore, results in discrete resonances separated by a timing mismatch equal to the pump period for one cycle T RT = λ p /c ≈ 3.5 fs. We emphasize here that the behavior of these resonances depends strongly on the sign and magnitude of T RT [28]. For a negative detuning, T RT , f rep < 0, the signal and idler separate into two distinct spectral peaks; therefore, all resonances with T RT < 0 are referred to as non-degenerate resonances.…”

“…A. Femtosecond OPO Operation Regimes When degenerate OPOs are properly dispersion compensated and synchronously pumped by femtosecond pulses, the timing mismatch has been shown to play a dominant role in the pulse formation dynamics [13,23,27,28]. We define the timing mismatch, T RT = T s − T p , as the difference between the OPO cold cavity round trip time T s and the pump repetition period T p .…”

Ladder of Eckhaus instabilities and parametric conversion in chi(2) microresonators

“…Therefore, the step in frequency also implies the abrupt change of the spatial period, as it happens in the Eckhaus instability scenario. Accounting for the quantisation of the spectrum calls for the model formulation and methodology different from the continual models of transverse nonlinear optics [27,[31][32][33][34][35], fibre-loop [28,29,36] and bow-tie [37][38][39] cavities, cf. with the soliton and frequency conversion theories in the high-finesse microresonators [40][41][42][43][44][45][46][47][48].…”