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首页> 外文会议>International Conference on Optics and Photonics 2015 >Spectral Characterization of a Fabry-Perot Etalon operating in Short Wave Infra-Red (SWIR) Region
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Spectral Characterization of a Fabry-Perot Etalon operating in Short Wave Infra-Red (SWIR) Region

机译：在短波红外（SWIR）区域工作的Fabry-Perot标准具的光谱表征

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摘要

A promising technique for precise spectral characterization of solid Etalon operating in SWIR wavelength is demonstrated using tunable laser with a minimum wavelength scan step interval of 1 picometer. Measurement is carried out for 1640nm - 1660nm, an important region containing greenhouse gas absorption spectra. The etalon considered for characterization is made of fused silica. The thickness is nearly 346 micron with physical diameter of 25.4 mm and clear aperture of 23 mm. The etalon has a finesse of 7.25 and extremely narrow bandwidth like 0.4 nm or 400 picometer. The measurement was as well carried out with an Optical Spectrum Analyzer (OSA). The conventional OSA instrument had a resolution of 80 picometer limiting the measurement capability to detect a spectral shift as fine as 50 picometer. Also the measured bandwidth had an error of ± 40 picometer over a spectral bandwidth of 400 picometer which is nearly ±10 %. This leads to the use of a tunable laser exhibiting a provision to vary the wavelength at a step of 1 picometer. This method provides measurement accuracy at least 4 times better than the earlier method. Accuracy may be further improved by making the wavelength scan step interval even finer. The absorption due to presence of greenhouse gas like methane is higher for the etalons with narrower bandwidth. This method can provide very good accuracy for characterization of etalons with spectral bandwidth as narrow as 50 picometer.
机译：使用最小波长扫描步距间隔为1皮米的可调激光器，展示了一种有前途的技术，可对SWIR波长下的固体Etalon进行精确的光谱表征。测量范围是1640nm-1660nm，这是一个包含温室气体吸收光谱的重要区域。考虑用于表征的标准具由熔融石英制成。厚度接近346微米，物理直径为25.4毫米，净孔径为23毫米。标准具的精细度为7.25，带宽极窄，例如0.4 nm或400皮米。用光谱分析仪（OSA）也进行测量。传统的OSA仪器的分辨率为80皮米，限制了检测像50皮米这样的光谱偏移的测量能力。同样，所测量的带宽在400皮米的光谱带宽上具有±40皮米的误差，几乎为±10％。这导致使用可调谐激光器，该可调谐激光器表现出以1皮米的步长改变波长的措施。这种方法提供的测量精度至少是早期方法的4倍。通过使波长扫描步骤间隔更加精细，可以进一步提高精度。对于具有较窄带宽的标准具，由于存在甲烷等温室气体而引起的吸收较高。该方法可以为标准具宽窄至50皮米的标准具的表征提供非常好的准确性。

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