【作者】 施鹏程；

【导师】 陈建国；

【作者基本信息】 四川大学 ， 光学， 2006， 硕士

【摘要】 半导体激光器列阵(LDA)具有体积小、重量轻、成本低、光电转化效率高、输出功率大、使用寿命长等诸多优点，目前已经在工业、医学和科学等领域得到了广泛的应用。但是由于输出光束质量较差，LDA的应用范围被大大限制。利用外腔镜耦合实现LDA的空间锁相可以在很大程度上改善LDA的输出光束质量，尤其适用于宽发光区的高功率LDA。这一技术具有良好的应用前景。 人们曾以基模高斯光束为模型，对LDA各单元间的基侧模耦合系数进行了一定的分析。但是随着发光单元间距和单元发光区的增大，宽条高功率LDA的出射光在侧向上仅仅用基侧模来描述是不够的，它还可能包括高阶侧模。 在本文中，我们针对宽条高功率LDA各发光单元间的基侧模耦合系数以及高阶侧模耦合系数进行了具体的计算和细致的分析，结果表明：外腔锁相LDA的各阶侧模各级耦合系数随着外腔长度的变化规律基本相似，只是其极值的大小和位置不同。对于同阶侧模的各级耦合系数，其极值随着耦合系数级次的增大而减小，极值所对应的腔长随着耦合系数级次的增大而增大；对于不同阶侧模的同一级耦合系数，其极值随着侧模阶次的增大而增大，极值所对应的腔长随着侧模阶次的增大而减小。要想在相邻单元间实现能量最强的基侧模的外腔锁相，外腔长度的选择十分重要，既要保证相邻单元的基侧模间具有足够的耦合，还要尽量增大相邻单元基侧模耦合系数与其它各耦合系数的差别。如果外腔长度过小的话，就会出现高阶侧模耦合较强锁定，基侧模耦合较弱的情况。这些结论对外腔锁相实验具有重要的参考价值。 此外，针对外腔耦合系数低于内腔自耦合系数的情况，我们从理论上设计更多还原

【Abstract】 Laser diode array (LDA) has many merits such as small volume, light weight, low cost, high photoelectric efficiency, high output of power and long life time. At present, LDA has been widely used in the fields of industry, medicine and science. However the relatively poor spatial property of LDA’s output limits its applications in many fields. The method of external phase-locking via an external cavity can greatly improve the output property of the LDA. It is especially suitable for wide-aperture LDA. The application of the technology is promising.A fundamental Gauss beam model had been adopted to analyze LDA’s coupling coefficient arising from fundamental lateral mode between emitters. But with increase of the distance among emitters and the broading of emittering areas, the output light of wide-aperture, high-power LDA supports not only fundamental lateral mode but also high-order lateral modes.In this thesis, detailed calculation and analysis have been made on the coupling coefficients arising from fundamental lateral mode and high-order lateral modes between emitters of wide-aperture, high-power LDA. The results show that: All coupling coefficients arising from different lateral modes follow similar variation patterns along with the change of external cavity (EC) length. But the magnitude and location of the maximum coupling coefficient are not same. For coupling coefficients of different grades arising from the same orders’ lateral mode, the maximum value更多还原