Backward terahertz-wave parametric oscillation in periodically poled stoichiometric lithium tantalate

A backward terahertz-wave parametric oscillator (BW-TPO) based on a periodically poled stoichiometric lithium tantalate is developed, offering an alternative to the commonly used periodically poled lithium niobate available, and proving that the BW-TPO can also be generated from other nonlinear optical gain media. With what we believe to be a new material, other such materials could also be established, opening up the BW-TPO for a wider breadth of applications.