二极管激光阵列在Talbot外腔中同相模的选择
In-phase mode selection of diode laser array in external Talbot cavity
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摘要: 从理论和实验上对二极管激光阵列在Talbot外腔中的锁相进行了研究。在同相模和异相模近场分布的基础上，利用1维情况下的菲涅耳衍射公式计算了其远场分布。根据同相模和异相模在Talbot腔中的分布特性，采用1/2 Talbot腔并将外腔镜倾斜一个角度a的方法既能选择同相模，又能使模式的功率损耗最小。二极管激光阵列芯片采用CD金刚石材料,“三明治”结构对其进行封装，明显地减小了阵列的“smile”效应。在实验中实现了二极管激光阵列同相模的锁相输出，远场单瓣模的半高全宽为0.11 mm。Abstract: Phase locking of a diode laser array in an external Talbot cavity was studied. Far field distributions of in-phase mode and out-of-phase mode were calculated using Fresnel diffraction formula of one-dimension on the basis of near field amplitude distribution. According to the distributions of the in-phase mode and out-of-phase mode in fraction Talbot cavity, a tilted external cavity mirror of 1/2 Talbot cavity was adopted, which made the in-phase mode be selected and the loss of the mode be lowered. In order to let the feedback light be injected into the elements effectively in this experiment, a “sandwich” construction of composite diamond is utilized to package the diode laser array which has obviously eliminated the “smile” effect. Phase locking of in-phase mode is obtained in the e
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Key words:
- diode laser array /
- talbot cavity /
- phase locking /
- in-phase mode /
- out-of-phase mode
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