Journal ArticleDOI
Single-ended infrared photothermal radiometric measurement of quantum efficiency and metastable lifetime in solid-state laser materials: The case of ruby (Cr/sup 3+/:Al/sub 2/O/sub 3/)
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In this article, a self-consistent frequency-scanned photothermal radiometric (PTR) detection scheme was applied to the measurement of the metastable state de-excitation parameters of a ruby laser rod.Abstract:
A simple, self-consistent frequency-scanned photothermal radiometric (PTR) detection scheme was applied to the measurement of the metastable state de-excitation parameters of a ruby laser rod. The radiative quantum efficiency and lifetime in this material were calculated from the extrema of the photothermal phase and the amplitude slope versus the excitation laser beam modulation frequency curves, without recourse to the conventional second measurement to eliminate effects of photothermal saturation. This technique simplifies significantly the experimental methodology, guarantees uniqueness of the measured quantities, and increases the measurement range of lifetimes as compared to other photothermal-based methods. Therefore, it may prove valuable for fast industrial quality control, as well as for fundamental studies of laser materials. >read more
Citations
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Continuous-wave laser operation and quantum efficiency of titanium-doped sapphire
P. Albers,E. Stark,Günter Huber +2 more
TL;DR: In this article, the free-running characteristics and the effective emission cross section of the Ti:Al2O3 were analyzed under argon-ion laser pumping and the temperature dependence of the 2E lifetime was measured from 4 to 650 K.
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Visible light emission from thin films containing Si, O, N, and H
Brian H. Augustine,Eugene A. Irene,Yunjian He,K. J. Price,Laurie E. McNeil,K. N. Christensen,Dennis M. Maher +6 more
TL;DR: In this article, the fabrication, chemical, optical, and photoluminescence characterization of amorphous silicon-rich oxynitride (SiOxNy:H) thin films by plasmaenhanced chemical-vapor deposition was reported.
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Diagnosis of Pit and Fissure Caries Using Frequency-Domain Infrared Photothermal Radiometry and Modulated Laser Luminescence
TL;DR: PTR and LUM, as a combined technique, has the potential to be a reliable tool to diagnose early pit and fissure caries and could provide detailed information about deep lesions.
Journal ArticleDOI
Nonintrusive, noncontacting frequency-domain photothermal radiometry and luminescence depth profilometry of carious and artificial subsurface lesions in human teeth
TL;DR: PTR amplitude frequency scans over the surface of enamels of variable thickness exhibit strong thickness dependence, thus establishing depth profilometric sensitivity to subsurface interfaces such as the dentin/enamel junction, as well as a pronounced curvature in both the amplitude and phase signal channels.
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Novel dental dynamic depth profilometric imaging using simultaneous frequency-domain infrared photothermal radiometry and laser luminescence
TL;DR: A high-spatial-resolution dynamic experimental imaging setup, which can provide simultaneous measurements of laser-induced frequency-domain infrared photothermal radiometric and luminescence signals from defects in teeth, has been developed for the first time.
References
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Journal ArticleDOI
Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
TL;DR: In this article, a quantitative derivation for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system is presented. And the theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustical spectroscopy.
Journal Article
Continuous-wave laser operation and quantum efficiency of titanium-doped sapphire
P. Albers,E. Stark,Günter Huber +2 more
TL;DR: In this article, the free-running characteristics and the effective emission cross section of the Ti:Al2O3 were analyzed under argon-ion laser pumping and the temperature dependence of the 2E lifetime was measured from 4 to 650 K.
Journal ArticleDOI
Continuous-wave laser operation and quantum efficiency of titanium-doped sapphire
P. Albers,E. Stark,Günter Huber +2 more
TL;DR: In this article, the free-running characteristics and the effective emission cross section of the Ti:Al2O3 were analyzed under argon-ion laser pumping and the temperature dependence of the 2E lifetime was measured from 4 to 650 K.
Journal ArticleDOI
Photoacoustic spectroscopy of luminescent solids: Ruby
J. C. Murphy,L. C. Aamodt +1 more
TL;DR: In this article, photoacoustic spectroscopy (PAS) is applied to the study of nonradiative processes in luminescent systems and a rate-equation model is developed and applied to interpreting the observed concentration-dependent metastable-level quenching rates in ruby.
Journal ArticleDOI
Opto—acoustic determination of absolute quantum yields in flourescent solutions
W. Lahmann,H.J. Ludewig +1 more
TL;DR: In this article, an opto-acoustic method for a precise determination of absolute fluorescence quantum efficiencies in solutions is described, using an intensity modulated beam of an argon ion laser.
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