Far Infrared Transmission Filters for the 300–18 cm<sup>−1</sup> Spectral Region

K. D. Möller; D. J. McMahon; D. R. Smith

doi:10.1364/AO.5.000403

Applied Optics
Vol. 5,
Issue 3,
pp. 403-406
(1966)
•https://doi.org/10.1364/AO.5.000403

Far Infrared Transmission Filters for the 300–18 cm⁻¹ Spectral Region

K. D. Möller, D. J. McMahon, and D. R. Smith

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K. D. Möller, D. J. McMahon, and D. R. Smith, "Far Infrared Transmission Filters for the 300–18 cm⁻¹ Spectral Region," Appl. Opt. 5, 403-406 (1966)

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Abstract

A simplified method for the fabrication of crystal powder transmission filters is reported. Transmission filter combinations are described for the 300–18 cm⁻¹ spectral region. The application of these filters in a small grating spectrometer is demonstrated by water vapor spectra.

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Grating lines/mm	Spectral region in cm⁻¹	Filter gratings 20 lines/mm	Black polyethylene	Quartz plate thickness in mm	Powder filter composition	Filter thickness in mm
20	300–150	2	2 sheets	—	250 mg BeO	0.5
					150 mg LiF
					2.2 g Polyethylene
8	160–80	2	2 sheets	—	250 mg BeO	1.0
					150 mg LiF
					350 mg BaF₂
					3.6 g Polyethylene
8	110–55	2	2 sheets	2 mm	250 mg KBr	0.55
					150 mg KCl
					250 mg BaF₂
					2.5 g Polyethylene
4	70–35	2	2 sheets	2 mm	250 mg KBr	0.45
					125 mg KCl
					250 mg BaF₂
					2.5 g Polyethylene
					300 mg TlCl	0.25
					2.5 g Polyethylene
2	35–18	—	3 sheets	3 mm roughed	250 mg KBr	0.5
					250 mg KCl
					250 mg BaF₂
					2.5 g Polyethylene
					1 g TlCl	0.4
					3 g Polyethylene
					1 g TlCl	0.25
					3 g Polyethylene

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Applied Optics