Laser oscillation of an organic distributed-feedback laser at the edge of a mini stopband
Laser oscillation of an organic distributed-feedback laser at the edge of a mini stopband
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DOI：
10.35848/1882-0786/abfb88
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发表时间：
2021-05
影响因子：
2.3
通讯作者：
Taiki Miura;T. Kanagasekaran;H. Shimotani;K. Tanigaki
中科院分区：
文献类型：
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作者：
Taiki Miura;T. Kanagasekaran;H. Shimotani;K. Tanigaki
采用5,5″-双（联苯-4-基）-2,2 ':5 '，2″-噻吩（BP3T）单晶作为活性层，研究了确定有机分布反馈（DFB）激光器振荡波长的条件。利用实验得到的折射率分析表明，部分BP3T DFB激光器的振荡波长处于阻带边缘，而另一些则处于小阻带边缘，满足了不同横模之间的相位匹配条件，这在DFB激光器中还没有被考虑到。通过BP3T DFB激光器的有限元光波导仿真，验证了不同横模的耦合性。
The conditions for determining the oscillation wavelength of organic distributed-feedback (DFB) lasers were investigated by employing 5,5″-bis(biphenyl-4-yl)-2,2′:5′,2″-terthiophene (BP3T) single crystals with various thicknesses as an active layer. Analysis using experimentally obtained refractive indexes revealed that the oscillation wavelengths of some BP3T DFB lasers are at the edge of a stopband, whereas the others are at an edge of a mini stopband, which satisfies the phase-matching condition among different transverse modes and has not been considered in DFB lasers so far. The coupling of different transverse modes was verified by finite-element optical-waveguide simulations of the BP3T DFB laser.