首页> 外文会议>Imaging Spectrometry XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6661 >Compact spectrophotometer using polarization-independent liquid crystal tunable optical filters
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Compact spectrophotometer using polarization-independent liquid crystal tunable optical filters

机译:紧凑型分光光度计,使用与偏振无关的液晶可调滤光片

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We introduce and demonstrate a simple spectrophotometer system insensitive to input polarization and with strong potential for compact and low-cost implementation. This technology has a wide variety of potential applications ranging from astronomy to medicine and even the cosmetics industry. To enable more powerful and portable microspectrometers we employ a novel design based on a tunable liquid crystal filter with polarization-independence, which is constructed of stacked liquid crystal polarization gratings (LCPGs). These switchable, anisotropic, thin diffraction gratings exhibit unique properties that include diffraction at visible and infrared wavelengths that can be coupled between only the zero- and first-orders (with nearly 100% and 0% experimentally verified efficiencies), depending on the applied voltage and wavelength of incident light. When combined with an elemental spatial filter, polarization-independent bandpass tuning can be achieved with minimum loss. Analogous to Lyot and Solc filters, several LCPGs are layered and introduced into a temporally resolved system using a single photodetector. The unique filter design enables improvement in terms of resolution and sensitivity by eliminating the polarization dependence present in all competing birefringence-based technologies. Also, the temporal detection system has a potential for improved miniaturization compared to any competing relevant approach and decreased cost by avoiding highly sensitive alignment, reflective diffraction components, Fabry-Perot cavities, and expensive detectors. In this work we describe the core principles of the tunable filter, present a representative spectrometer system design, report preliminary experimental data, and discuss the capabilities of the system in terms of spectral range, resolution, and sensitivity.
机译:我们介绍并演示了一个简单的分光光度计系统,该系统对输入偏振不敏感,并且具有紧凑和低成本实现的强大潜力。这项技术具有广泛的潜在应用,从天文学到医学甚至是化妆品工业。为了使功能更强大,更便携的显微光谱仪,我们采用了一种新颖的设计,该设计基于具有偏振独立性的可调液晶滤光片,该滤光片由堆叠式液晶偏振光栅(LCPG)构成。这些可切换的各向异性薄衍射光栅具有独特的特性,包括可见光和红外波长的衍射,这些衍射仅在零阶和一阶之间耦合(通过实验验证的效率接近100%和0%),具体取决于施加的电压和入射光的波长。当与基本空间滤波器结合使用时,可以以最小的损耗实现与偏振无关的带通调谐。类似于Lyot和Solc滤光片,使用单个光电探测器将多个LCPG分层并引入到时间分辨系统中。独特的滤波器设计消除了所有竞争性双折射技术中存在的偏振依赖性,从而提高了分辨率和灵敏度。而且,与任何竞争性相关方法相比,时间检测系统都有改进小型化的潜力,并且可以避免高度敏感的对准,反射衍射组件,法布里-珀罗腔和昂贵的检测器,从而降低成本。在这项工作中,我们描述了可调滤波器的核心原理,提出了一种具有代表性的光谱仪系统设计,报告了初步的实验数据,并讨论了光谱范围,分辨率和灵敏度方面的系统功能。

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