Bismuth-Coated Fabry-Perot Etalon for Use in the 2.5–10-μ Region

R. E. Kagarise

doi:10.1364/JOSA.51.000830

Bismuth-Coated Fabry-Perot Etalon for Use in the 2.5–10-μ Region

R. E. Kagarise

Journal of the Optical Society of America
Vol. 51,
Issue 8,
pp. 830-833
(1961)
•https://doi.org/10.1364/JOSA.51.000830

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R. E. Kagarise, "Bismuth-Coated Fabry-Perot Etalon for Use in the 2.5–10-μ Region," J. Opt. Soc. Am. 51, 830-833 (1961)

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History
- Original Manuscript: January 19, 1961
- Published: August 1, 1961

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Abstract

A Fabry-Perot etalon, employing bismuth-coated CaF₂ plates, has been constructed for measuring the dispersion of liquids in the infrared region. The reflectivity of bismuth is sufficiently high to give fringes of high contrast. In order to take advantage of this improved fringe sharpness, a grating spectrometer was used to measure the wavelength of the maxima. Because of a nonideal phase shift, it was necessary to apply an empirically determined correction to the normal integral orders of interference. By using this approach it has been possible to measure the refractive index of CS₂ with a relative accuracy of about ±0.001.

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λ	2t₁ − ∊	λ	2t₂ − ∊	λ	2t₃ − ∊	λ	2t₄ − ∊
7.166	487.83	7.098	99.933	6.879	48.659	6.905	28.130
6.766	487.61	6.630	99.907	6.034	48.613	5.569	28.114
6.405	487.16	6.221	99.915	5.375	48.617	4.663	28.129
6.091	487.67	5.862	99.970	4.849	48.663	4.010	28.146
5.807	488.09	5.534	99.877	4.412	48.648	3.516	28.156
5.539	487.67	5.246	99.894	4.048	48.658	3.127	28.153
5.297	487.58	4.752	99.949	3.740	48.668	2.819	28.192
5.184	487.54	4.534	99.879	3.474	48.667
4.781	487.85	4.338	99.882	3.244	48.682
4.599	487.68	4.158	99.883	3.044	48.716
4.433	487.73	3.839	99.875
4.278	487.77	3.567	99.912
4.132	487.66	3.328	99.860
3.997	487.66	3.221	99.864
3.812	487.98	3.026	99.858
Average	487.70 ± 0.137		99.897 ± 0.022		48.659 ± 0.019		28.146 ± 0.016

λ	2t₁ − ∊	λ	2t₂ − ∊
7.086	99.895	6.818	48.340
6.614	99.771	5.995	48.386
6.206	99.772	5.340	48.357
5.850	99.844	4.383	48.358
5.272	99.827	4.024	48.359
5.230	99.762	3.717	48.380
4.743	99.793	3.453	48.384
4.527	99.764	3.225	48.396
4.330	99.720	3.020	48.320
4.151	99.736
3.989	99.824
3.562	99.788
3.440	99.786
3.128	99.744
3.025	99.825
Average	99.790 ± 0.030		48.364 ± 0.019

λ	2t₁ − ∊	λ	2t₂ − ∊	λ	2t₃ − ∊	λ	2t₄ − ∊
7.166	487.83	7.098	99.933	6.879	48.659	6.905	28.130
6.766	487.61	6.630	99.907	6.034	48.613	5.569	28.114
6.405	487.16	6.221	99.915	5.375	48.617	4.663	28.129
6.091	487.67	5.862	99.970	4.849	48.663	4.010	28.146
5.807	488.09	5.534	99.877	4.412	48.648	3.516	28.156
5.539	487.67	5.246	99.894	4.048	48.658	3.127	28.153
5.297	487.58	4.752	99.949	3.740	48.668	2.819	28.192
5.184	487.54	4.534	99.879	3.474	48.667
4.781	487.85	4.338	99.882	3.244	48.682
4.599	487.68	4.158	99.883	3.044	48.716
4.433	487.73	3.839	99.875
4.278	487.77	3.567	99.912
4.132	487.66	3.328	99.860
3.997	487.66	3.221	99.864
3.812	487.98	3.026	99.858
Average	487.70 ± 0.137		99.897 ± 0.022		48.659 ± 0.019		28.146 ± 0.016

λ	2t₁ − ∊	λ	2t₂ − ∊
7.086	99.895	6.818	48.340
6.614	99.771	5.995	48.386
6.206	99.772	5.340	48.357
5.850	99.844	4.383	48.358
5.272	99.827	4.024	48.359
5.230	99.762	3.717	48.380
4.743	99.793	3.453	48.384
4.527	99.764	3.225	48.396
4.330	99.720	3.020	48.320
4.151	99.736
3.989	99.824
3.562	99.788
3.440	99.786
3.128	99.744
3.025	99.825
Average	99.790 ± 0.030		48.364 ± 0.019

Abstract

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Equations (8)

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