We report an innovative method for early monitoring of the Opto-thermal health of laser-driven phosphor-converted white light source using low coherence spectral interference technique. A phosphor layer was irradiated using a high-power laser source in reflection mode and the broadband light generated from the phosphor layer was made incident onto a common path interferometer. The interferometer was made of two optically flat glass plates stacked together with minimum optical path difference between the two reflecting components (≤ 1µm). The constructive and destructive interference peaks were recorded in the spectrum. A significant change in Stokes shift was observed from spectral interference peak shifts in a short interval of time and this helped in analyzing the phosphor Opto-thermal behaviour from thermal initialization to the material saturation. The minimization of the observed changes in the Stokes shift can be helpful in the material development process for thermally stable illumination.

我们报告了一种创新的方法，该方法可以使用低相干光谱干扰技术对激光驱动的磷光转换白光源的光热健康进行早期监测。使用大功率激光源以反射模式照射磷光体层，并且使从磷光体层产生的宽带光入射到公共路径干涉仪上。干涉仪由两块光学平板玻璃板堆叠而成，两个反射组件之间的光程差最小（≤1µm）。在光谱中记录了相长和相消干涉峰。在很短的时间间隔内，光谱干扰峰的位移就可观察到斯托克斯位移的显着变化，这有助于分析从热初始化到材料饱和的磷光体的光热行为。观察到的斯托克斯位移的变化最小化有助于热稳定照明的材料开发过程。