Filmed Surfaces for Reflecting Optics*

Georg Hass

doi:10.1364/JOSA.45.000945

Journal of the Optical Society of America
Vol. 45,
Issue 11,
pp. 945-952
(1955)
•https://doi.org/10.1364/JOSA.45.000945

Filmed Surfaces for Reflecting Optics

Georg Hass

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Georg Hass, "Filmed Surfaces for Reflecting Optics*," J. Opt. Soc. Am. 45, 945-952 (1955)

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Abstract

This paper gives a survey of films and film combinations used for reflecting optics. The preparation and properties of unprotected mirror coatings, protective layers for front surface mirrors, reflection filters, and replica mirrors are discussed.

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	Al, 600–700 A thick, deposited in 7 sec at 1×10⁻⁵ mm Hg % reflectance			Al, 600–700 A thick, deposited in 60 sec at 2×10⁻⁴ mm Hg % reflectance
(mμ)	After 30 min	After 1 mo	After 1 yr	After 30 min	After 1 mo	After 1 yr
220	91.5	90.1	89.9	83.5	74.2	72.5
360	92.4	92.0	91.9	91.0	90.3	90.1
550	91.6	91.4	91.4	90.9	90.6	90.5

	“good coating” 6 sec, 1×10⁻⁵ mm Hg	“poor coating” 55 sec, 1×10⁻⁴ mm Hg
R before UV	91.5%	86.9%
R after 24 hrs UV	90.3%	82.5%
R after 68 hrs UV	89.5%	80.2%

	Al, 600–700 A thick, deposited in 7 sec at 1×10⁻⁵ mm Hg % reflectance			Al, 600–700 A thick, deposited in 60 sec at 2×10⁻⁴ mm Hg % reflectance
(mμ)	After 30 min	After 1 mo	After 1 yr	After 30 min	After 1 mo	After 1 yr
220	91.5	90.1	89.9	83.5	74.2	72.5
360	92.4	92.0	91.9	91.0	90.3	90.1
550	91.6	91.4	91.4	90.9	90.6	90.5

	“good coating” 6 sec, 1×10⁻⁵ mm Hg	“poor coating” 55 sec, 1×10⁻⁴ mm Hg
R before UV	91.5%	86.9%
R after 24 hrs UV	90.3%	82.5%
R after 68 hrs UV	89.5%	80.2%

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Journal of the Optical Society of America