講演情報
[10a-A11-3]Nonlinear Absorption of 2-Hexyltriazolopyridine-Core-Based D–A–D Organic Dyes for Ultrafast Optical Applications
〇Hsin Yi Wei1, Ja Hon Lin1, Tzu Chau Lin2, Youhei Chitose3, Chihaya Adachi3 (1.National Taipei University of Technology, 2.National Central University, 3.Kyushu University)
キーワード：
D-A-D Organic Dye、Two-photon absorption、Ultrafast Optical Applications
In this study, we investigated the two-photon absorption (TPA) properties of a donor–acceptor–donor (D–A–D) organic laser dye (2DFL-2Tp-PT), which was designed and synthesized using diphenylamino groups as electron donors and 2-hexyltriazolopyridine as the electron acceptor. The synthesized dye solution in toluene exhibited a primary linear absorption peak at 482 nm, attributed to intramolecular charge transfer (ICT), and a photoluminescence (PL) emission peak at 550 nm. Under excitation by a near-infrared passively mode-locked (PML) Ti:sapphire laser, the dye solution exhibited distinct TPA-induced PL emission centered at 587.7 nm. A quadratic dependence of the TPA-PL intensity on the pump peak power was confirmed, yielding a double-logarithmic plot fitted slope of n = 2.02. Based on the pump-wavelength-dependent TPA-PL measurements and evaluation using the relative fluorescence calibration method, the highest TPA cross-section was determined to be approximately 1734.6 GM at an excitation wavelength of 840 nm. Owing to its strong TPA properties, the synthesized 2-hexyltriazolopyridine-core D–A–D organic dye was used as a nonlinear medium in an interferometric autocorrelator to determine the pulse duration of a PML Yb-doped fiber laser.