| Summary: | 碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 101 === The nonlinear optical properties of lanthanum doped lead titanate (PLT) and lithium niobate (LiNbO3) were investigated using Z-scan technique with femtosecond mode-locked Ti-sapphire laser and femtosecond laser amplifier. Our laser light source was a mode-locked Ti-sapphire laser, the output pulse width was approximately 130 femtoseconds at a wavelength of 800 nm, and the repetition rate was 1 kHz. The results demonstrate self-focusing of lead lanthanum titanate (PLT) with a nonlinear refractive index, n2 of (7.08±1.26)×10-11(esu). The real part of the third-order nonlinear susceptibility χ(3) of lead lanthanum titanate (PLT) is(2.49±0.44) ×10-19(m2/V2). The results demonstrate reverse saturable absorption of lead lanthanum titanate (PLT) with a three -photon absorption coefficient, α3 of (2.05±0.54) ×10-21(cm3/W2). The fifth-order nonlinear susceptibility χ(5) ) of lead lanthanum titanate (PLT) is (1.68±2.06) ×10-36(m4/V4). The results demonstrate reverse saturable absorption of lithium niobate (LiNbO3) with a three -photon absorption coefficient, α3 of (3.92±2.05) ×10-21 (cm3/W2). The fifth-order nonlinear susceptibility χ(5) ) of lead lanthanum titanate (PLT) is (1.69±0.82) ×10-36 (m4/V4).
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