Damage assessment and waveguide fabrication of C ion irradiation on (La, Sr) (Al, Ta)3 crystals

We herein report planar waveguide structures containing dual modes in (La0.3Sr0.7)(Al0.65Ta0.35)O3 via the irradiation of 6.0 MeV C ions at fluences of 1.0 × 1015 ions/cm2 and 2.0 × 1015 ions/cm2. The Rutherford backscattering/channeling spectrometry, Raman spectra and X-ray diffraction were also measured to study the damage and microstructural characteristics. The guiding modes were measured using the prism-coupling method. The refractive index profiles were reconstructed according to the effective refractive index functions. The near field intensity profiles were acquired using the end-face coupling method, followed by comparison to simulation results using the beam propagation method. The propagation loss of the TM0-mode at 633 nm was also measured. The characteristics of C ion irradiation with fluences of 1.0 × 1015 ions/cm2 and 2.0 × 1015 ions/cm2 were compared.