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Preparation and transmission characteristics of a mid-infrared attenuated total reflection hollow waveguide based on a stainless steel capillary tube

机译：基于不锈钢毛细管的中红外衰减全反射空心波导的制备及传输特性

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Stainless steel (SUS) capillary tubes were examined as a category of structural tube for establishing a metallic attenuated total reflection (ATR) GeO2 hollow waveguide. GeO2 films were grown on the inner wall of SUS tubes by different liquid phase deposition (LPD) cycles. Fourier transform infrared (FTIR) spectra, scanning electronic microscope (SEM) image, and transmission loss for a CO2 laser were measured to investigate the effects of the LPD cycles on the transmission behavior of the hollow waveguide samples. The film thickness and surface roughness increase with every LPD cycle. The two LPD cycle sample has a film thickness equivalent to the CO2 laser wavelength, while the surface roughness is acceptable. This sample has the lowest transmission loss (0.27 dB/m) among these samples. The bending loss, output beam profile, and full divergence angle (FDA) were further studied. Higher-order modes are excited by bending the sample, inducing additional loss, decentralized beam profile, and larger FDA. (C) 2016 Optical Society of America
机译：检查了不锈钢（SUS）毛细管作为用于建立金属衰减全反射（ATR）GeO2空心波导的结构管的类别。通过不同的液相沉积（LPD）循环，在SUS管的内壁上生长了GeO2膜。测量了傅立叶变换红外（FTIR）光谱，扫描电子显微镜（SEM）图像以及CO2激光的传输损耗，以研究LPD循环对空心波导样品传输行为的影响。薄膜厚度和表面粗糙度随着每个LPD周期的增加而增加。两个LPD循环样品的膜厚等于CO2激光波长，而表面粗糙度是可以接受的。在这些样本中，此样本的传输损耗最低（0.27 dB / m）。进一步研究了弯曲损耗，输出光束轮廓和全发散角（FDA）。通过弯曲样品，引起附加损耗，分散光束轮廓和更大的FDA激发高阶模。 （C）2016美国眼镜学会

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