Abstract
Quasi-phase-matched, singly resonant integrated optical parametric oscillators (SR-IOPO), with feedback at the signal wavelength only, offer simplified tuning, high stability, high conversion efficiency, and a low threshold in comparison with bulk devices [1]. Usually, they are pumped by narrow linewidth sources as the spectral properties of the pump are transferred to signal and idler. However, this coherence transfer is strongly determined by the dispersion properties of the waveguide material leading to surprising phenomena. Therefore, we investigate in this contribution the coherence properties of signal and idler generated by the parametric non-degenerate three-wave interaction in a SR-IOPO. In particular, operation with a broad-bandwidth cw-pump and the resulting coherence transfer to signal and idler are studied. To get a highly coherent signal we take advantage of the convection-induced phase-locking mechanism, based on a group-velocity difference between the resonant signal and the pump and idler waves, and a good group-velocity matching of the last two [2]. However, in contrast to the previous investigation for a type II configuration [2], we show here the feasibility of coherent signal generation from an incoherent cw-pump at λp = 1.535 μm in a type I {eee} Ti:LiNbO3 SR-IOPO. The wavelength of the resonant signal is λS = 3.941 μm, near the infrared transparency limit. Around this wavelength triple (λp, λs, and λi; = 2.514 μm) the substrate dispersion yields significant group-velocity differences Δvspsi = |vs−vp,i| between resonant signal and pump / idler, but a small Δvpi = |vp−v;| only. Both properties are necessary to get an efficient convection-induced phase-locking mechanism.
© 2007 IEEE
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