Photoacoustic measurements of surface and bulk absorption in HF/DF laser window materials

A. Hordvik; L. Skolnik

doi:10.1364/AO.16.002919

Applied Optics
Vol. 16,
Issue 11,
pp. 2919-2924
(1977)
•https://doi.org/10.1364/AO.16.002919

Photoacoustic measurements of surface and bulk absorption in HF/DF laser window materials

A. Hordvik and L. Skolnik

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A. Hordvik and L. Skolnik, "Photoacoustic measurements of surface and bulk absorption in HF/DF laser window materials," Appl. Opt. 16, 2919-2924 (1977)

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Abstract

A new photoacoustic technique is used for quantitatively determining surface and bulk absorption losses at HF/DF laser wavelengths. Materials investigated include Si, GaAs, ZnSe, Al₂O₃, MgO, MgF₂, CaF₂, SrF₂, BaF₂, LiF, and KMgF₃. Although several materials show predicted intrinsic bulk absorption at 3.8 μm, no material is found to exhibit predicted intrinsic absorption loss at 2.7 μm. High surface absorption at both HF and DF laser frequencies generally dominate over-all absorption losses for most of the materials tested.

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	HF (2.7 μm)		DF (3.8 μm)
Material	Bulk (cm⁻¹)	Loss per surface	Bulk (cm⁻¹)	Loss per surface
Si	1.2 × 10⁻⁴	6.4 × 10⁻⁴	4.2 × 10⁻⁴	10 × 10⁻³
ZnSe	6 × 10⁻⁴	8 × 10⁻⁴	1.0 × 10⁻³	^a
GaAs	3.2 × 10⁻³	1.2 × 10⁻³	3.0 × 10⁻³	6.0 × 10⁻⁴
Al₂O₃	2 × 10⁻⁴	12.4 × 10⁻³	2.0 × 10⁻²	^a
MgO	5.2 × 10⁻³	9 × 10⁻⁴	6.7 × 10⁻⁴	1 × 10⁻⁴
CaF₂	1.9 × 10⁻⁴	5 × 10⁻⁴	6.2 × 10⁻⁵	1 × 10⁻⁴
MgF₂	2.5 × 10⁻⁴	1 × 10⁻³	9.1 × 10⁻⁵	7 × 10⁻⁵
SrF₂	2.7 × 10⁻⁴	6 × 10⁻⁴	1.4 × 10⁻⁴	9 × 10⁻⁵
BaF₂	3.0 × 10⁻⁴	4 × 10⁻⁴	1.2 × 10⁻⁴	1 × 10⁻⁴
LiF	8.3 × 10⁻⁴	3 × 10⁻⁴	1.5 × 10⁻³	^a
KMgF₃	7 × 10⁻⁴	^a	7 × 10⁻⁴	^a

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