Absolute Specular Reflectance Measurements of Highly Reflecting Optical Coatings at 10.6 μ

D. Kelsall

doi:10.1364/AO.9.000085

Applied Optics
Vol. 9,
Issue 1,
pp. 85-90
(1970)
•https://doi.org/10.1364/AO.9.000085

Absolute Specular Reflectance Measurements of Highly Reflecting Optical Coatings at 10.6 μ

D. Kelsall

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D. Kelsall, "Absolute Specular Reflectance Measurements of Highly Reflecting Optical Coatings at 10.6 μ," Appl. Opt. 9, 85-90 (1970)

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Abstract

A high precision method for measuring the specular reflectivity of mirrors at 10.6 μ with a CO₂ laser source when the reflectivity of the mirror approaches close to unity is described. The results of measurements on a range of evaporated thin film coatings are reported. Measurements at other wavelengths using a helium–neon laser have also been made, and this is discussed.

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Reflectivity		Comments	Reflectivity		Comments
Gold reflector		Comments	“Enhanced” metal reflector		Comments
0.9849			0.9908
0.9867			0.9894
0.9863	}	Same source	0.9921	}	Same source
0.9860	}	Same source	0.9917	}	Same source
0.9881	}	Same source	0.9891		Glass substrate	}	Same source
0.9875	}	Same source	0.9904		Silicon substrate
0.9888			0.9910		Germanium substrate
0.9705			0.9933	}	Same source
0.9876		With thin quartz overcoat	0.9922	}	Same source
0.9709		With thin germanium overcoat	0.9792
0.9915		Solid copper substrate	0.9789
0.9866		Solid germanium substrate	0.9791
Aluminum reflector			All-dielectric reflector
0.9831	}	Same source—aged and fast evaporation in H. V.	0.9907	}	Same source
0.9835	}	Same source—aged and fast evaporation in H. V.	0.9867	}	Same source
0.9710		Aged	0.9782
0.9771		Aged	0.9778
0.9734		With SiO overcoated (aged) 2.5 cm × 7.6 cm	0.9579
0.9840		Fresh coating
Silver reflector
0.9589
0.9693	}	Same source
0.9692
0.9661
0.9888		Fresh coating

Wavelength		Reflectivity
Wavelength		0.6328 μ	1.152 μ	10.6 μ
Gold
Bennett (UHV)^d		0.9465	0.9872	0.9940
Measured^a		0.9508	0.9859	0.9888
	^b	0.9470	0.9848	0.9875
Aluminum
Bennett (UHV)^d		0.9072	0.9585	0.9875
Measured^c		0.9065	0.9561	0.9840

Reflectivity		Comments	Reflectivity		Comments
Gold reflector		Comments	“Enhanced” metal reflector		Comments
0.9849			0.9908
0.9867			0.9894
0.9863	}	Same source	0.9921	}	Same source
0.9860	}	Same source	0.9917	}	Same source
0.9881	}	Same source	0.9891		Glass substrate	}	Same source
0.9875	}	Same source	0.9904		Silicon substrate
0.9888			0.9910		Germanium substrate
0.9705			0.9933	}	Same source
0.9876		With thin quartz overcoat	0.9922	}	Same source
0.9709		With thin germanium overcoat	0.9792
0.9915		Solid copper substrate	0.9789
0.9866		Solid germanium substrate	0.9791
Aluminum reflector			All-dielectric reflector
0.9831	}	Same source—aged and fast evaporation in H. V.	0.9907	}	Same source
0.9835	}	Same source—aged and fast evaporation in H. V.	0.9867	}	Same source
0.9710		Aged	0.9782
0.9771		Aged	0.9778
0.9734		With SiO overcoated (aged) 2.5 cm × 7.6 cm	0.9579
0.9840		Fresh coating
Silver reflector
0.9589
0.9693	}	Same source
0.9692
0.9661
0.9888		Fresh coating

Wavelength		Reflectivity
Wavelength		0.6328 μ	1.152 μ	10.6 μ
Gold
Bennett (UHV)^d		0.9465	0.9872	0.9940
Measured^a		0.9508	0.9859	0.9888
	^b	0.9470	0.9848	0.9875
Aluminum
Bennett (UHV)^d		0.9072	0.9585	0.9875
Measured^c		0.9065	0.9561	0.9840

Abstract

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Equations (12)

Applied Optics