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The angular dependence of optical interference filters in the Near IR can be greatly reduced through the use of novel coating materials and design strategies

机译:通过使用新型涂层材料和设计策略,可以大大降低近红外光学干涉滤光片的角度依赖性

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摘要

The bandwidth of an optical interference filter when used in an optical system is limited by the angular range of its illumination. The limitation has two main aspects: The central wavelength of the filter shifts to shorter wavelength and the shape of the transmission band degrades. The first effect results in filters with increased transmission width and decrease average transmission while the second results in reduction in the average transmission of the filter. For compact systems with high numerical aperture these effects can be pronounced. By minimizing the propagation angles in the filters these effects can be substantially reduced in the near infra red (NIR) to levels similar to IR filters. We have recently developed materials and design techniques that permit us to obtain low angle shift coating that maintain very high transmission in the spectral range from 800 to 1100 nm. In this paper we will demonstrate the performance, design and fabrication, of fully blocked (200 to 1200 nm) narrow band pass filters and their measured performance over a range of angles (0-30°). Filters with bandwidths from 15 to 100 nm will be shown to illustrate the versatility of these techniques.
机译:当在光学系统中使用时,光学干涉滤光片的带宽受到其照明角度范围的限制。该限制有两个主要方面:滤光片的中心波长转移到较短的波长,并且传输带的形状下降。第一种效果导致滤波器具有增大的透射宽度并减小平均透射率,而第二种效果导致滤波器的平均透射率减小。对于具有高数值孔径的紧凑型系统,这些影响非常明显。通过最小化滤光片中的传播角度,可以在近红外(NIR)中将这些影响充分降低到类似于IR滤光片的水平。我们最近开发了材料和设计技术,这些材料和设计技术使我们能够获得在800至1100 nm光谱范围内保持很高透射率的低角度偏移涂层。在本文中,我们将演示全阻塞(200至1200 nm)窄带通滤波器的性能,设计和制造,以及它们在一定角度范围(0-30°)内的测量性能。将显示带宽为15至100 nm的滤光片,以说明这些技术的多功能性。

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