Wen Xin, Lenef Alan, Raukas Madis, Klotzkin David
Appl Opt. 2023 May 10;62(14):3557-3560. doi: 10.1364/AO.486404.
In this paper, we propose a bandpass filter design method for laser activated remote phosphor (LARP) usage. This design uses the Brewster angle as the passband instead of a wavelength passband. Two advantages are found with this design. First, the transmittance at the Brewster angle is naturally 100%, which is optimal. Second, the stop band reflectance with a wide angular range is better compared to the dichroic filter in a LED-phosphor model. We design two optical thin film filter samples to enhance the extraction efficiency of YAG:Ce phosphor with the same design criteria, objective function, and optimization algorithm. With 50-layer designing, the optical losses for LARP are 23.7% and for LED-phosphor are 26.0%.
在本文中，我们提出了一种用于激光激活远程荧光粉（LARP）应用的带通滤波器设计方法。该设计使用布儒斯特角作为通带，而非波长通带。此设计有两个优点。其一，在布儒斯特角处的透过率自然为100%，这是最佳的。其二，与LED-荧光粉模型中的二向色滤光片相比，在宽角度范围内的阻带反射率更好。我们按照相同的设计标准、目标函数和优化算法设计了两个光学薄膜滤波器样本，以提高YAG:Ce荧光粉的提取效率。通过50层设计，LARP的光学损耗为23.7%，LED-荧光粉的光学损耗为26.0%。
