A Mirrorless Terahertz- Wave Parametric Oscillator

We demonstrated a mirrorless terahertz (THz)-wave parametric oscillator (TPO) based on backward optical parametric oscillation. The mirrorless TPO has no cavity mirrors because of inhibit feedback effect inside a periodically poled lithium niobite (PPLN). The oscillator offered wide tunability, mode-hop free tuning, narrow linewidth, and high conversion efficiency. Prototype of mirrorless TPO has the dimension of 80 mm with 30 mm square and the weight was about 110 g. The prototype indicates that mirrorless TPO realizes compact and robust THz-wave sources with excellent features based on nonlinear wavelength conversion.