Temperature dependence of the refractive index of alkaline earth fluorides

H. G. Lipson; Y. F. Tsay; B. Bendow; P. A. Ligor

doi:10.1364/AO.15.002352

Applied Optics
Vol. 15,
Issue 10,
pp. 2352-2354
(1976)
•https://doi.org/10.1364/AO.15.002352

Temperature dependence of the refractive index of alkaline earth fluorides

H. G. Lipson, Y. F. Tsay, B. Bendow, and P. A. Ligor

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H. G. Lipson, Y. F. Tsay, B. Bendow, and P. A. Ligor, "Temperature dependence of the refractive index of alkaline earth fluorides," Appl. Opt. 15, 2352-2354 (1976)

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Abstract

The temperature coefficient of the refractive index dn/dT of CaF₂, SrF₂, and BaF₂ single crystals is measured by a laser interferometric technique at a number of frequencies over temperatures ranging from 20°C to 85°C. Although dn/dT is found to display little dispersion between 0.6328 μm and 3.39 μm, its magnitude shows a slight increase with temperature. A possible origin of the latter effect is discussed.

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		Measured values

		Present work, λ (μm)

Crystal	T(K)	0.6328	1.15	3.39	Ref. 3
CaF₂	310	−11.8 ± 0.7	−12.0 ± 0.5	−11.5 ± 0.7	(T ≈ 290 K)
	330	−12.4 ± 0.5	−12.6 ± 0.5	−12.0 ± 0.5	−10.4 at 0.6438 μm
	350	−12.7 ± 0.5	−13.1 ± 0.5	−12.4 ± 0.5	−10.5 at 1.014 μm
					−8.1 at 3.422 μm
SrF₂	310	−12.0 ± 0.7	−12.7 ± 0.5	−13.0 ± 0.5
	330	−12.6 ± 0.6	−13.3 ± 0.6	−13.3 ± 0.6	—
	350	−13.0 ± 0.5	−13.8 ± 0.6	−13.5 ± 0.5
BaF₂	310	−16.7 ± 0.4	−17.1 ± 0.5	−16.8 ± 0.4	(T ≈ 310 K)
	330	−17.3 ± 0.3	−17.5 ± 0.5	−17.3 ± 0.5	−15.23 at 0.6536
	350	−17.9 ± 0.3	−17.8 ± 0.5	−17.6 ± 0.4	μm

	λ(μm)

Crystal	0.6328	1.15	3.39
CaF₂	−11.8	−11.7	−11.5
SrF₂	−12.0	−11.9	−11.8
BaF₂	−16.7	−16.7	−16.6

			dn/dT (10⁻⁶/K)

Crystal	ρ(dn/dρ), Ref. 7	α at 310 K (10⁻⁶/K), Ref. 6	Calculated from Eq. (5) (see text)	Experimental value, this work
CaF₂	0.208	58.7	−12.7	−11.8 ± 0.7
SrF₂	0.30	57.6	−17.3	−12.0 ± 0.7
BaF₂	0.336	57.5	−19.3	−16.7 ± 0.4

		Measured values

		Present work, λ (μm)

Crystal	T(K)	0.6328	1.15	3.39	Ref. 3
CaF₂	310	−11.8 ± 0.7	−12.0 ± 0.5	−11.5 ± 0.7	(T ≈ 290 K)
	330	−12.4 ± 0.5	−12.6 ± 0.5	−12.0 ± 0.5	−10.4 at 0.6438 μm
	350	−12.7 ± 0.5	−13.1 ± 0.5	−12.4 ± 0.5	−10.5 at 1.014 μm
					−8.1 at 3.422 μm
SrF₂	310	−12.0 ± 0.7	−12.7 ± 0.5	−13.0 ± 0.5
	330	−12.6 ± 0.6	−13.3 ± 0.6	−13.3 ± 0.6	—
	350	−13.0 ± 0.5	−13.8 ± 0.6	−13.5 ± 0.5
BaF₂	310	−16.7 ± 0.4	−17.1 ± 0.5	−16.8 ± 0.4	(T ≈ 310 K)
	330	−17.3 ± 0.3	−17.5 ± 0.5	−17.3 ± 0.5	−15.23 at 0.6536
	350	−17.9 ± 0.3	−17.8 ± 0.5	−17.6 ± 0.4	μm

	λ(μm)

Crystal	0.6328	1.15	3.39
CaF₂	−11.8	−11.7	−11.5
SrF₂	−12.0	−11.9	−11.8
BaF₂	−16.7	−16.7	−16.6

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Applied Optics