Miniaturization of the tunable laser equipment is an important factor for further development in various optoelectronic technologies. To realize the compact tunable laser devices, an optical gain medium having a broadband optical gain characteristic is required. In this study, we propose a promising strategy for preparing an optical gain film that exhibits a ∼250 nm gain bandwidth in the visible wavelength region. This film consists of a polymer matrix co-doped with organic luminescent molecules that form a complex of the excited state, i.e., exciplex. The exciplex state can co-exist with the monomolecular exciton state, leading to broadband (400–650 nm) optical gain with a large Stokes shift. Optically pumped lasing action is also possible when the film is combined with an optical resonator. This strategy would be useful for developing a compact tunable laser device without active medium replacement.Miniaturization of the tunable laser equipment is an important factor for further development in various optoelectronic technologies. To realize the compact tunable laser devices, an optical gain medium having a broadband optical gain characteristic is required. In this study, we propose a promising strategy for preparing an optical gain film that exhibits a ∼250 nm gain bandwidth in the visible wavelength region. This film consists of a polymer matrix co-doped with organic luminescent molecules that form a complex of the excited state, i.e., exciplex. The exciplex state can co-exist with the monomolecular exciton state, leading to broadband (400–650 nm) optical gain with a large Stokes shift. Optically pumped lasing action is also possible when the film is combined with an optical resonator. This strategy would be useful for developing a compact tunable laser device without active medium replacement.

中文翻译：

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一种具有超宽带光学增益特性的聚合物薄膜

可调谐激光设备的小型化是各种光电技术进一步发展的重要因素。为了实现紧凑的可调谐激光器件，需要具有宽带光增益特性的光增益介质。在这项研究中，我们提出了一种制备光学增益薄膜的有前景的策略，该薄膜在可见光波长范围内具有~250 nm 的增益带宽。该薄膜由聚合物基质与有机发光分子共掺杂组成，这些分子形成激发态的复合物，即激基复合物。激复合态可以与单分子激子态共存，导致宽带（400-650 nm）光学增益和大斯托克斯位移。当薄膜与光学谐振器结合时，光泵激激光作用也是可能的。这种策略对于开发无需更换有源介质的紧凑型可调谐激光装置将非常有用。可调谐激光装置的小型化是各种光电技术进一步发展的重要因素。为了实现紧凑的可调谐激光器件，需要具有宽带光增益特性的光增益介质。在这项研究中，我们提出了一种制备光学增益薄膜的有前景的策略，该薄膜在可见光波长范围内具有~250 nm 的增益带宽。该薄膜由聚合物基质与有机发光分子共掺杂组成，这些分子形成激发态的复合物，即激基复合物。激复合态可以与单分子激子态共存，导致宽带（400-650 nm）光学增益和大斯托克斯位移。当薄膜与光学谐振器结合时，光泵激激光作用也是可能的。这种策略对于开发无需更换活性介质的紧凑型可调谐激光设备非常有用。