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摘要: 采用DFB分布反馈结构的有机激光由于其自身优点备受关注，而利用高阶布拉格反馈的多光束有机激光及其原理鲜有报道。不同于以往的低阶布拉格反馈形成单波导或单光束激光，本文通过在平面有机半导体波导引入高阶布拉格反馈分别制备了红色和蓝色多束有机激光器。利用四阶布拉格反馈和PVK:DCJTI薄膜实现三光束红光激光器，出射角度为±53°和0.5°。利用五阶布拉格反馈和PS:DSA-ph薄膜实现四光束蓝光激光器，出射角度为±18°和±75°。融合平面波导与光栅耦合的机理，研究了高阶布拉格光栅反馈与器件特性之间的关系。结果表明，理论计算的光束耦合角度和实际测试相符，结果在一定程度上为多光束有机激光器件的设计提供了参考。Abstract: The advantages of organic lasers with DFB distributed feedback structures have attracted much attention, however, there are few reports on the principle of multi-beam organic lasers using high-order Bragg feedback. Different from single-waveguide or single-beam lasers implemented by low-order Bragg feedback in the past, high-order Bragg feedback is introduced into a planar organic semiconductor waveguide to produce red and blue multi-beam organic lasers in this paper. Using a fourth-order Bragg feedback and PVK:DCJTI film, a three-beam red laser is realized with an exit angle of ±53° and 0.5°. A four-beam blue laser is implemented using a fifth-order Bragg feedback and PS:DSA-ph film with exit angles of ±18° and ±75°. The relationship between higher-order Bragg grating feedback and device characteristics is studied by combination of plane waveguide and grating coupling. The results show that the theoretically calculated beam coupling angle is consistent with the actual test, which provides guidance for the design of multi-beam organic laser devices to some extent.
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Key words:
- organic laser /
- Bragg scattering /
- grating coupling
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Figure 3. Emission spectra of PVK:DCJTI system pumped by optically pulsed laser at above lasing threshold.The inset shows the photograph of the far field pattern
Figure 4. Output emission intensity integrated over all wavelengths as a function of pump intensity for PVK:DCJTI film, from which we get the threshold of laser is 0.02 mJ/pulse.The inset shows the emission spectra of PVK:DCJTI system pumped by optically pulsed laser at different pump intensity
Figure 5. Graphical determination of the possible oscillation wavelengths for the DFB laser(PVK:DCJTI) in a multimode optical waveguide.Curves show the effective refractive index of the various TE and TM waveguide modes as a function of wavelength.The shaded region shows the approximate wavelength range over which the DCJTI exhibits gain.Intersection of the straight line with the dispersion curves describes the possible oscillation wavelengths
Figure 6. Grating coupling process between the waveguide mode and laser emission under the fourth Bragg condition
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