Laser lighting systems can take many form factors for applications, such as spotlighting, general illumination, or decorative lighting. The use of lasers in conjunction with phosphors for white lighting leads to questions about incorporating the various package elements. Some practical considerations of a transmission geometry system implementing a blue laser and a yellow Ce:YAG single crystal phosphor are discussed, with specific focus on color tuning and the optical efficiency of the single crystal. A compact emitter is demonstrated with examples of modifications to increase the system performance and complexity. Moving from a cool white system to a warm white system is done through the addition of a red light such as a red laser or red phosphor. The single crystal phosphor component needs to allow light to be coupled in from the laser and has high extraction efficiency. A wavelength‐selective reflective coating is implemented to address these concerns, which increases the luminous efficacy of the system. Engineering the phosphor element using this concept may allow for single crystal phosphors to be viable options for future laser lighting systems.

中文翻译：

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紧凑型发射器的透射几何激光照明

激光照明系统可以采用多种形式的应用，例如聚光灯，普通照明或装饰照明。将激光器与磷光体结合使用以进行白色照明会引发有关合并各种封装元件的问题。讨论了实现蓝色激光和黄色Ce：YAG单晶磷光体的透射几何系统的一些实际考虑，特别关注颜色调整和单晶的光学效率。演示了紧凑型发射器，并带有修改示例，以提高系统性能和复杂性。通过添加红光（例如红色激光或红色磷光体）可以完成从冷白色系统到暖白色系统的移动。单晶磷光体组分需要允许光从激光器耦合进来并且具有高提取效率。实施了波长选择性反射涂层来解决这些问题，从而提高了系统的发光效率。使用该概念对磷光体元件进行工程设计可以使单晶磷光体成为未来激光照明系统的可行选择。