Fig. 1. (a) Effective nonlinear coefficient d₃₃ varies with the azimuthal angle θ in an x-cut TFLN microdisk; (b) false-colored SEM images of the TFLN microdisk viewed at different angles.

Fig. 2. (a) Schematic of the experimental setup; (b) transmission spectrum of the TFLN microdisk. (c), (d) Lorentzian fitting of the resonances at 1563.3 and 781.7 nm, revealing a loaded Q factor of 3.32 × 10⁷ and 2.83 × 10⁶, respectively.

Fig. 3. Experimental results of SHG in the TFLN microdisk. (a) Spectrum of the SHG and cTHG; (b) SH power as a function of the cw pump.

Fig. 4. Experimental results of broadband SHG in the TFLN microdisk using tunable cw pump. (a), (b) Spectra of broadband SHG with a wavelength interval of 1 and 0.1 nm, respectively.

Fig. 5. Experimental results of the broadband SHG pumped by fs, SC laser, and ASE in the TFLN microdisk. (a) Spectra of the fs laser before and after coupling into the microdisk; (b) broadband SHG of fs laser; (c) SH power varies with respect to the incident fs pump. (d) Spectra of the SC laser before and after coupling into the microdisk; (e) broadband SHG of the SC laser; (f) SH power varies with respect to the incident SC pump. (g) Spectra of the ASE before and after coupling into the microdisk; (h) broadband SHG of ASE; (i) SH power varies with respect to the incident ASE pump.