Transmission of “Cutoff” Glass Filters Employed in Solar Radiation Research. II

A. K. Ångström; A. J. Drummond

doi:10.1364/JOSA.50.000974

Journal of the Optical Society of America
Vol. 50,
Issue 10,
pp. 974-979
(1960)
•https://doi.org/10.1364/JOSA.50.000974

Transmission of “Cutoff” Glass Filters Employed in Solar Radiation Research. II

A. K. Ångström and A. J. Drummond

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A. K. Ångström and A. J. Drummond, "Transmission of “Cutoff” Glass Filters Employed in Solar Radiation Research. II," J. Opt. Soc. Am. 50, 974-979 (1960)

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Abstract

The work reported constitutes part of an investigation into the transmission characteristics of colored glass filters. Special attention is paid here to the determination of the absorption coefficient in the main transmission regions of Schott OG1, RG2, and RG8 filters, through the employment of substantial thicknesses of glass. This study embraces also an investigation of the temperature dependence of the absorption coefficients.

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λ(mμ)	α₁·10⁴^a	α₂·10⁴^b	$\frac{α_{1} - α_{2}}{α_{1}}$	Mean α·10⁴	α_85°C·10⁴	F(r)
700	30.8	31.1	+1.0%	31	34	0.915
800	24.9	24.6	−1.2	25	26	0.915
1100	36.0	35.3	−2.0	35	36	0.920
1420	39.0	38.7	−0.8	39	42	0.920
1500	31.5	30.7	−2.7	31	34	0.920
1800	52.6	51.7	−1.7	52	53	0.920
2000	75.0	75.0	±0.0	75	75	0.917
2300	181	181	±0.0	180	180	0.920
2500	248	250	+0.8	250	250	0.920
2700	425	431	+1.5	430	430	0.915

λ (mμ)	Absorption coefficient α^a			Reflection factor F(r)
λ (mμ)	OG1	RG2	RG8	OG1	RG2	RG8
700	0.0021	0.0031		0.915	0.915	0.915
800	0.0025	0.0025	0.0083	0.910	0.915	0.905
1100	0.0033	0.0036	0.0040	0.915	0.920	0.910
14(00)	0.0040	0.0039	0.0041	0.915	0.920	0.910
1500	0.0030	0.0031	0.0029	0.910	0.920	0.910
1800	0.0057	0.0052	0.0059	0.920	0.920	0.915
2000	0.0083	0.0075	0.0086	0.915	0.917	0.910
2300	0.020	0.018	0.021	0.920	0.920	0.910
2500	0.029	0.025	0.031	0.925	0.920	0.930

	OG1		RG2		RG8
2.0 mm+20°C	I	II	I	II	I	II
Center of cutoff (mμ)	532	537	627	627.5	695.5	692

λ(mμ)	α₁·10⁴^a	α₂·10⁴^b	$\frac{α_{1} - α_{2}}{α_{1}}$	Mean α·10⁴	α_85°C·10⁴	F(r)
700	30.8	31.1	+1.0%	31	34	0.915
800	24.9	24.6	−1.2	25	26	0.915
1100	36.0	35.3	−2.0	35	36	0.920
1420	39.0	38.7	−0.8	39	42	0.920
1500	31.5	30.7	−2.7	31	34	0.920
1800	52.6	51.7	−1.7	52	53	0.920
2000	75.0	75.0	±0.0	75	75	0.917
2300	181	181	±0.0	180	180	0.920
2500	248	250	+0.8	250	250	0.920
2700	425	431	+1.5	430	430	0.915

λ (mμ)	Absorption coefficient α^a			Reflection factor F(r)
λ (mμ)	OG1	RG2	RG8	OG1	RG2	RG8
700	0.0021	0.0031		0.915	0.915	0.915
800	0.0025	0.0025	0.0083	0.910	0.915	0.905
1100	0.0033	0.0036	0.0040	0.915	0.920	0.910
14(00)	0.0040	0.0039	0.0041	0.915	0.920	0.910
1500	0.0030	0.0031	0.0029	0.910	0.920	0.910
1800	0.0057	0.0052	0.0059	0.920	0.920	0.915
2000	0.0083	0.0075	0.0086	0.915	0.917	0.910
2300	0.020	0.018	0.021	0.920	0.920	0.910
2500	0.029	0.025	0.031	0.925	0.920	0.930

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Equations (21)

Journal of the Optical Society of America