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One- and two-photon stimulated emission in oligothiophenes slngle crystals

机译：寡噻吩单晶中的单光子和双光子激发发射

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摘要

We report on the observation of stimulated emission (SE) in plane-parallel single crystals of quaterthiophene (4T), sexithiophene (6T) and octithiophene (8T) at room temperature. One-photon transverse pumping at normal incidence induces gain narrowing and leads to two SE lines emerging at respectively low (50 μJ/cm~2) and high (500 μf/cm~3) pumping levels. Two-photon excitation is realized in a longitudinal geometry, i.e. the near-IR beam of a Ti:sapphire laser being directed parallel to the crystal faces. Intense and highly directional emission of visible light (green for 4T, orange for 6T and red for 8T) is generated along the pump pathway throughout the crystal over lengths of several millimeters. Since in the solid state oligothiophenes also possess carrier mobilities as high as 0. l cm~2/V s, they appear as potential materials in view of an organic laser diode.
机译：我们报告了在室温下，季噻吩（4T），六噻吩（6T）和辛噻吩（8T）的平面平行单晶体中受激发射（SE）的观察结果。垂直入射的单光子横向泵浦会引起增益变窄，并导致两条SE线分别以低（50μJ/ cm〜2）和高（500μf/ cm〜3）的泵浦水平出现。在纵向几何形状中实现了双光子激发，即，Ti：蓝宝石激光器的近红外光束平行于晶面定向。沿整个晶体的泵浦路径会产生强烈且高度定向的可见光发射（绿色表示4T，橙色表示6T，红色表示8T），长度为几毫米。由于在固态中，低聚噻吩还具有高达0.1cm 2 / V s的载流子迁移率，因此考虑到有机激光二极管，它们作为潜在的材料出现。

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