Low-loss lithium tantalate on insulator waveguide towards on-chip nonlinear photonics

We develop a lithium tantalate on insulator waveguide at 1550 nm with a 0.28-dB/cm loss and a ring resonator with a quality factor of 1.1 million.
$\chi^{(3)}$
nonlinearity is examined for applications in nonlinear photonics.