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The present work is devoted to the development of the method of laser photothermal radiometry with a view to increasing its spatial resolution over the depth of the specimen when sarface layers of the substance of thickness about I micrones or less are to be investLgated. As an example, results of an int,estigation of radiattion absorption in the surface layer of a lithium niobate crystal are presented. The absorption index measured at a wavelength of 1.08 microns was 0.6 cm -I.
Basic methods of laser spectroscopy, which are used to study photoinduced absorption in various media, are breafly considered. Comparative analysis of these methods is performed and latest results are discussed. Different schemes and examples of their practical implementation are considered.
Applications of Surface Science
Photoacoustic and photothermal techniques for powder and surface spectroscopy1980 •
2018 •
It is established that the mechanisms of light absorption in titanium dioxide films differ in the visible and near-infrared spectral ranges. In the near-infrared range of the spectrum, the contribution to the absorption coefficient made by the intrinsic defects associated with the nonstoichiometry of the film composition is dominant. At the same time, in the visible spectral range, the main contribution to absorption is most likely made by external defects, namely, foreign inclusions and impurities contained in the starting material for film deposition. It is shown that the introduction of monitoring of the photothermal signal from the pellets of the raw material makes it possible to minimize and stabilize the absorption in the visible region of the spectrum.
Central European Journal of Physics
Photothermal methods for determination of thermal properties of bulk materials and thin films2009 •
Journal of Optoelectronics and Advanced Materials
Laser photoacoustic spectroscopy principles, instrumentation, and characterizationLaser photoacoustic spectroscopy has emerged over the last decade as a very powerful investigation technique, capable of measuring trace gas concentrations at sub-ppbV level. Recent achievements in this field have made it possible to fully characterize the method and improve the design of instrument components in view of the task they are expected to fulfill. The basic principles of laser photoacoustic spectroscopy are reviewed and compared with those of other spectroscopic techniques. Photoacoustic signal generation is discussed, covering different aspects regarding resonant cells, that are resonance frequencies, dissipation processes, quality factor, pressure amplitude, cell constant, optimal PA cell geometry, voltage signal, and saturation effects. Noises and other limiting factors which determine the ultimate detection sensitivity are presented, and various types of noises are measured. The interfering gases play an important role both in limiting the sensitivity of the method a...
Pure and Applied Chemistry
Quantities, terminology, and symbols in photothermal and related spectroscopies (IUPAC Recommendations 2004)2000 •
CO2 Laser - Optimisation and Application
CO2 Laser Photoacoustic Spectroscopy: I. Principles2012 •
2010 •
Progress in Quantum Electronics
On thermal effects in solid-state lasers: The case of ytterbium-doped materials2006 •
physica status solidi (a)
Recent advances in application of acoustic, acousto-optic and photoacoustic methods in biology and medicine2007 •
2001 •
Terahertz Spectroscopy and Applications II
<title>Plasmon-based terahertz laser without population inversion</title>1999 •
Optics and Lasers in Engineering
Laser Beam MicroMachining (LBMM) -A review2015 •
Journal of Analytical Chemistry
Advances in thermal lens spectrometry2015 •
Optics Communications
Acousto-optic laser chopper based on light diffraction by hypersonic standing waves in lithium niobate single crystal2013 •
Quantum Electronics
LASER APPLICATIONS AND OTHER TOPICS IN QUANTUM ELECTRONICS: On the possibility of development of a photochemical unit based on an NH3 laser with an intracavity reactor2006 •
International Journal of Thermal Sciences
Non-contact photopyroelectric method applied to thermal and optical characterization of textiles. Four-flux modeling of a scattering sample2003 •
Quantum Electronics
A wide-aperture Pockels cell with three ring electrodes2004 •
1998 •
Quantum Electronics
On the possibility of development of a photochemical unit based on an NH laser with an intracavity reactor2006 •
Nonlinear Optics '98. Materials, Fundamentals and Applications Topical Meeting (Cat. No.98CH36244)
Spectrum control of intense THz-radiation from InAs under magnetic field irradiated with stretched femtosecond laser pulses1998 •
Quantum Electronics
LASER APPLICATIONS AND OTHER TOPICS IN QUANTUM ELECTRONICS: A wide-aperture Pockels cell with three ring electrodes2004 •
Journal of Synchrotron Radiation
Influence of crystallographic orientation of biogenic calcite on in situ Mg XANES analyses2008 •
Radiation Effects and Defects in Solids
Cr 3 -doped borates—potential tunable laser crystals?1995 •
Radiation Effects and Defects in Solids
Mn 2+ luminescence in Mg-Ai spinels1995 •
Radiation Effects and Defects in Solids
Self-trapped exciton luminescence under dense electronic excitations: Ion-induced transient thermal effects1995 •
Nonlinear Optics' 98: …
Enhancing the detectability of ballistic photons travelling through highly scattering media by frequency-doubling their far-field pattern1998 •
Applied Optics
Thermodynamic-temperature determinations of the Ag and Au freezing temperatures using a detector-based radiation thermometer2007 •
Quantum Electronics
On the possibility of development of a photochemical unit based on an NH 3 laser with an intracavity reactor2006 •
Nonlinear Optics '98. Materials, Fundamentals and Applications Topical Meeting (Cat. No.98CH36244)
Numerical study of second harmonic generation in semiconductor waveguides1998 •
Applied Optics
Model for continuous-wave laser-induced thermal lens spectrometry of optically transparent surface-absorbing solids2005 •
2013 •
2004 •
CO2 Laser - Optimisation and Application
CO2 Laser Photoacoustic Spectroscopy: II. Instrumentation and Applications2012 •