Cascaded degenerate four-wave mixing generation in thin-film lithium tantalate microdisk cavity

On -chip efficient nonlinear functions are instrumental in escalating the utilities and performance of photonic integrated circuits, especially for a wide range of classical and quantum applications, such as tunable coherent radiation, optical frequency conversion, spectroscopy, quantum science, etc. Here, we fabricated a Z -cut lithium tantalate on insulator (LTOI) microdisk with high quality (Q <^> 106) factors. Cascaded three- and four -wave mixing generation simultaneously were achieved in the LTOI microdisk cavity, due to the high Q factor with a strongly confined light field, relatively large nonlinear coefficient, and optical damage threshold of the LTOI microdisk. The strict mode phase -matching condition and the secondharmonic efficiency of the whole three -wave mixing processes were analyzed. Our work shows that the LTOI microresonators with the high Q factor and its high optical damage threshold and wide transparency range can support a variety of on -chip optical nonlinear processes, which heralds its application potential in integrated nonlinear photonics.