半导体激光器列阵在外腔下的光谱特性
Spectra of diode laser array operating in external cavity
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摘要: 使用普通高反镜作为19个单元的半导体激光器列阵（LDA）的外腔，通过调节高反镜的位置和角度，使LDA发出的光反馈回有源层，从而压窄了输出光谱并降低了LDA的阈值电流。实验中，运行于外腔下的LDA在不同的驱动电流下的输出光谱均被压窄到了原来的1/10左右，阈值电流从7 A降到了5.5 A，并且在9 A的偏置电流下输出功率提高了2倍。Abstract: Using a high reflectivity mirror as the external cavity of a 19-unit diode laser array(LDA), the optical beam from the LDA can be coupled into itself by adjusting the distance and tilting angle of the external mirror. The bandwidth of the LDA was narrowed down and its threshold current was reduced. With the external feedback, the spectra of the LDA at different drive currents were narrowed to about the tenth of that without feedback, the threshold current decreased from 7 A to 5.5 A, and the output power increased by two times.
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Key words:
- diode laser array /
- external cavity /
- high reflectivity mirror /
- spectrum
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