We propose a technique to generate etendue maintained white light. The proposed technique uses three high-power blue light emitting diodes (LEDs) with identical characteristics to pump green aluminate (GAL) green-yellow phosphor coated on the inner channel of a waveguide. The technique offers two methods of generation of white light. Standalone partial conversion of blue to green and yellow light by GAL phosphor, combined with unconverted blue light, produces white light homogenized within the light guide. Complete conversion of blue to green and yellow light with the further addition of blue and red wavelengths from additional LED sources multiplexed with the output is also possible to further increase total white light output. Following design and optical modeling to prove the concept, the proposed technique is demonstrated, which shows white light emissions from the waveguide with no increase in aperture size while the original LED etendue is maintained. The proposed technique offers an alternative to low-lifetime, low-efficiency xenon lamps for light sources in etendue critical applications such as endoscopy.

中文翻译：

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Etendue通过泵浦的绿色铝酸盐绿黄色荧光粉保持发光二极管产生白色固态光

我们提出了一种产生展光度维持的白光的技术。所提出的技术使用三个具有相同特性的大功率蓝色发光二极管（LED）来泵送涂覆在波导内部通道上的绿色铝酸盐（GAL）绿黄色磷光体。该技术提供了两种产生白光的方法。GAL荧光粉将蓝光独立地部分转换为绿光和黄光，再加上未转换的蓝光，可在光导内产生均质的白光。通过将来自其他LED光源的蓝色和红色波长进一步增加与输出复用，将蓝色光完全转换为绿色和黄色光，也可以进一步提高总白光输出。通过设计和光学建模来证明这一概念，然后对所提出的技术进行了演示，它显示了从波导发出的白光，而孔径尺寸没有增加，同时保持了原始的LED光学扩展量。所提出的技术提供了一种低寿命，低效率的氙气灯的替代品，用于在集光率关键应用（例如内窥镜检查）中使用的光源。