Abstract
We present a cascaded continuous-wave singly resonant optical parametric oscillator (SRO) delivering idler output in mid-IR and terahertz frequency range. The SRO was pumped by an ytterbium-doped fiber laser with 27W linear polarization pump powers, and based on periodically poled MgO:LiNbO3 crystal (PPMgLN) in two-mirror linear cavity. The PPMgLN is 50mm long with 29.5μm period. The idler power output at 3811nm was obtained 2.6W. The additional spectral components that have been attributed to cascaded optical parametric processes are described at increasing pump levels. Besides the initial signal component at about 1476.8nm, further generated wavelengths with frequency shifts about 47cm−1, 94cm−1 and 104cm−1 were observed. It was speculated that the idler waves lie in the terahertz (THz) domain from the observed results.
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