High-Order-Mode supercontinuum generation based on shortcut to adiabaticity coupling

Broadband optical sources have been attracting widespread attention because of their remarkable potential for application to quantum technology. One of the major obstacles to realization of such applications is the weak anomalous group velocity dispersion (GVD) of these sources and low coupling efficiency of high order mode for generating supercontinuum generation (SCG). In this work, using a shortcut to adiabaticity (STA) approach, high order modes can be excited selectively with coupling efficiency of more than 80 % to enable octave spanning supercontinuum generation within a waveguide composed of tantalum pentoxide (Ta₂O₅), which is a high nonlinear refractive index material. The SCG over the range from 650 nm to 1300 nm, which corresponds to one octave, was demonstrated and analyzed when the material was pumped using a femtosecond laser with a center wavelength of 1030 nm.