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Apparatus comprising a quantum cascade laser with improved distributed feedback for single mode operation
Apparatus comprising a quantum cascade laser with improved distributed feedback for single mode operation
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机译:包括具有改进的分布式反馈的量子级联激光器的设备,用于单模操作
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摘要
An article comprising a QC-DFB laser is disclosed. In the QC-DFB laser (10), an overlying grating structure achieves relatively strong coupling of the guided mode to the grating, and is thus highly effective in inducing single-mode operation even under cw operating conditions. The grating structure includes grooves (25) etched in a plasmon-enhanced confinement layer (PECL) (22) disposed adjacent and in contact with an upper metallic electrode (23). The grating structure and the PECL (22) are designed such that in the grooves (25), the laser mode travelling in the waveguide can couple efficiently to the surface-plasmon at the electrode interface. This results in strong modulation of the laser mode, leading to strong modulation of, inter alia, the effective refractive index. IMAGE
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