"etalon" meaning in English

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      "name": "bor"
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  "etymology_text": "From French étalon (“measuring gauge, standard”).",
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          "ref": "2004, S. C. Gupta, Textbook On Optical Fiber Communication And Its Applications, page 153:",
          "text": "It will be shown that the simple theory outlined in the preceding paragraph, which is applicable to single-plate etalons, can be used to predict the main features of the spectral curve of a multi element etalon.",
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        {
          "ref": "2006, Walter Koechner, Solid-State Laser Engineering, page 264:",
          "text": "The laser output will be composed of longitudinal modes that fall inside the transmission band of the etalon, hence a narrowing of the laser line width is observed.",
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        },
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          "ref": "2009, V. Rajendran, Engineering Physics, page 7.15:",
          "text": "The next step of this experiment is to compare the etalon m₁m₂ (shortest length) with the etalon m₃m₄ (the next one). For this two etalons are arranged side by side as shown in Fig. 7.13a.",
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        "An optical device containing parallel mirrors, used as a narrow band filter, often in laser design."
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          "word": "Fabry-Pérot interferometer"
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        },
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