Optoacoustic Spectrometry of Surfaces: Dielectric Coatings for Laser Mirrors

Abstract

A double-beam optoacoustic spectrometer has been employed to obtain the transmission, reflectance, and absorption spectra of a number of dielectric-coated glasses used for laser mirror applications. The complementary nature of these spectra is demonstrated and, by simply reversing the sample within the optoacoustic cell, the absorption spectra of the surface coating and the substrate may be determined independently.

Infrared absorption spectroscopy of carbon monoxide on nickel films: a low temperature thermal detection technique

“…Keeping only the first (16) The responsivity Sf relates the signal voltage to the absorbed power nPf and is given by 6/T IR 6e 0 o (17) It is largest at low temperatures and for small thermal conductances. …”

Thermal characterization of ceramic tapes using photoacoustic effect

“…During the last decade, several methods have been developed for the nondestructive characterization of thermal, optical and structural properties of materials [2][3][4][5][6][7][8][9]. The laser-induced PA method has gained more popularity due to its simple, elegant experimental scheme as well as its versatility in employing different configurations to measure the required thermo-physical parameters with great accuracy [10 -12].…”

Preparation of Thin Films of Ternary Complex of Europium with 2-Thenoyltrifluoroacetone and o-Phenanthroline

“…Photoacoustic (PA) spectroscopy enables to obtain spectra on any type of solids and it is a direct monitor of energy gap and non-radiative relaxation channel, the complement of absorption and photoluminescence spectroscopic technique [16]. Especially, the PA spectra of thin films are only relevant to the absorption characteristics, free of the influence of interference effect [17]. Hence, PA spectrum of ternary complex thin film was measured.…”