Abstract

Traditionally, the optical absorption in thin dielectric films has been obtained by comparing the absorption in coated and uncoated substrates. A new technique has been developed in which the absorption of the film is obtained directly without resorting to comparison or difference methods. This method relies on the separation of surface and bulk heat that results from laser calorimetric measurements on long, bar-shaped samples. Single layer films of As₂S₃, CaF₂, ThF₄, and PbF₂ were deposited on a KCl bar, and the absorption coefficient of each film was extracted from the slopes of the temperature–time curves.

© 1977 Optical Society of America

Static profile calorimetry of laser materials

Perry A. Miles
Appl. Opt. 16(11) 2897-2901 (1977)

Bulk and surface calorimetric measurements at CO wavelengths

S. D. Allen and J. E. Rudisill
Appl. Opt. 16(11) 2914-2918 (1977)

Measurement techniques for small absorption coefficients: recent advances

A. Hordvik
Appl. Opt. 16(11) 2827-2833 (1977)

Analysis of laser calorimetric data

H. B. Rosenstock, M. Hass, D. A. Gregory, and J. A. Harrington
Appl. Opt. 16(11) 2837-2842 (1977)

Thin-film 2.8-μm and 3.8-μm absorption in single-layer films

James A. Harrington, J. Earl Rudisill, and Morris Braunstein
Appl. Opt. 17(17) 2798-2801 (1978)