Reversible Laser Threshold Modulation in Dithienylethene Conjugated Polymer Blends: A Concept for q-Switching in Organic DFB Lasers
Reversible Laser Threshold Modulation in Dithienylethene Conjugated Polymer Blends: A Concept for q-Switching in Organic DFB Lasers
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DOI：
10.1021/acsphotonics.8b01641
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发表时间：
2019-01
期刊：
影响因子：
7
通讯作者：
A. Steppert;A. Mikosch;T. Haraszti;R. Göstl;A. Kuehne
中科院分区：
文献类型：
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作者：
A. Steppert;A. Mikosch;T. Haraszti;R. Göstl;A. Kuehne
调谐谐振腔质量是无机激光器的一项长期建立的技术，可以获得极短或时间精确的激光脉冲。然而，这种所谓的q开关，其中谐振器可以是“开”和维持激射或被“关”和抑制激射是广泛未知的共轭聚合物激光器。在这里，我们将热稳定的光致变色二噻吩基乙烯与共轭聚合物激光增益材料混合在由双光子激光写入产生的一维和二维衍射反馈光栅上。通过用不同颜色的光照射，热致变色的二噻吩基乙烯可逆地调制增益介质的折射率，并表现出与增益介质竞争吸收，有效地抑制一种状态下的激光发射，并允许另一种状态下的低阈值（2.15 mJ/cm 2）激光发射。
Tuning the resonator quality is a long established technique for inorganic lasers giving access to extremely short or temporally precise laser pulses. However, this so-called q-switching, where the resonator can be “on” and sustain lasing or be switched “off” and inhibit lasing is widely unknown for conjugated polymer lasers. Here, we admix thermally stable photochromic dithienylethenes with conjugated polymer laser gain materials on 1D and 2D diffractive feedback gratings, which are generated by two-photon laser writing. By irradiation with differently colored light, the thermally bistable dithienylethenes reversibly modulate the refractive index of and exhibit competing absorption with the gain medium, effectively suppressing laser emission in the one state and allowing low threshold (2.15 mJ/cm2) laser emission in the other state.