Showing papers in "Infrared Physics in 1989"

TL;DR: In this article, the photophysical primary processes of IR-multiphoton excitation in laser chemistry are discussed and the available experimental evidence on the main mechanisms of these processes is summarized and compared to various theoretical views.

TL;DR: The binary rare earth tellurite glasses (AnOm)x-(TeO2)1−x, where x = 0.1 and A = Sm, Ce, La, were prepared by melting the oxides at 800°C for 1 h and quenched rapidly as mentioned in this paper.

TL;DR: In this paper, the submillimeter properties of dielectrics, ferroelectrics, antiferromagnets and high T c superconductors are discussed on the base of BWO-spectroscopy data.

TL;DR: In this paper, the orientation and waist size of the best-matched Gaussian beam, the power coupling efficiency to this beam, and the radiation resistance of 90° corner-cube antennas were calculated.

TL;DR: In this paper, the infrared spectrum of CH 3 OH between 950 and HOOcm −1 has been measured by a high resolution Fourier transform spectrometer, and a catalog of 3410 assigned lines is presented, as well as the Taylor development tables for evaluating the energies of the upper levels of the corresponding transitions.

TL;DR: In this paper, the authors present a survey of the Optically Packed Far Infrared (FIR) laser from the engineer's point of view, including principles of operation, design and characteristics.

TL;DR: A new type of corner-reflector mixer mount, which has the advantages of ease of fabrication and assembly as well as frequency versatility, has been designed and constructed with the incorporation of a microstrip matching network.

TL;DR: In this article, a quantitative analysis concerning the influence of the sky temperature values variations on net radiant heat loss and the heat balance of the low-sloped roofs is presented, and the results of calculated and measured sky temperatures for a horizontal surface in clear night-time sky conditions are compared and discussed.

TL;DR: In this paper, a dual CO2 laser heterodyne spectrometer was used to measure ethane and ethylene emission lines on Jupiter using a dual-CO2 laser Heterodyne Spectrometer.

TL;DR: In this article, the authors present a brief survey of the investigations of the spectrum of (HF)2 in the range from 20 to 15,000 cm−1 and a detailed dicussion of the transition assigned tentatively to the K = 2 → 1 subband of the Torsional vibration (out-of-plane bending) close to 430 cm −1 is presented.

TL;DR: In this paper, a computer best fit program based on the Taylor series expansion of the energy levels has been used for the line assignments for the FIR spectrum of CH3OH between 8−100 cm−1.

TL;DR: In this paper, a review of measurements on the narrowbandgap semiconductors InSb, (Hg,Cd)Te, Ge, and InAs is presented.

TL;DR: In this article, the authors present a stationary, dual-beam CO-laser and a mobile CO 2 -laser photoacoustic system which have both been applied to the monitoring of various gaseous pollutants.

TL;DR: In this article, the intrinsic carrier concentration and reduced Fermi energy were calculated for InAs1−xSbx with 0 ⩽ x⩽ 1 and 50 ⩩� T ⩾ 300 K. The calculations have been performed in terms of the k·p theory.

TL;DR: In this article, the experimental and theoretical results obtained in Moscow State University in the last few years, in the area of laser optoacoustics of condensed matter, are reviewed.

TL;DR: In this paper, the authors investigated the contribution of background gas to the FTIR spectrum and to the nonlinearity of Boltzmann plots in the 8-9 μm region at high resolutions of 0.004 and 0.0024 cm−1 (fwhm).

TL;DR: In this paper, the conformation of the boron-oxygen network of lithium halides "doped" glasses by MIR spectroscopy was studied and the modifying properties of the lithium oxide on the binary system B 2 O 3 -Li 2 O are investigated by the same technique.

TL;DR: In this paper, a multispectral infrared (3-13 μm) radiance measurement of an object in 10 narrow spectral bands is performed, via a balancing calculation the measured data lead to the temperature of the object, its spectral emissivity and the object's environment.

TL;DR: The steady state spatial distribution of the electric field and free hole and ionized acceptor concentrations near implanted contacts in p-type extrinsic germanium photoconductors have been calculated by solving the full continuity equation using a variable finite-difference technique as discussed by the authors.

TL;DR: In this article, the structural characterization of thin solid films of both Li borate glasses and layered insertion compounds in Li microbatteries was investigated by IR spectroscopy. And the results showed that the far-IR reflectivity spectra of the semiconductors of the In-Se family are those of InSe and In 2 Se 3 for given ratio of fluxes during the film preparation by the MBD technique.

TL;DR: The thermal emission of semiconductors under the fundamental absorption edge at excitation of nonequilibrium charge carriers in them has been investigated in this paper, where a broad spectrum of various actions upon a semiconductor (photoexcitation, contact injection, magnetoconcentration effect) has been used for modulation of the emissivity of crystals under isothermal conditions.

TL;DR: In this paper, a far infrared stressed Ge:Ga photoconductors which have response up to 200μm wavelength have been fabricated and studied to apply them to astronomical and atmospherical observations using balloons and satellites.

TL;DR: Optical losses and mechanical strength of chalcogenide glass fibers prepared by crucible technique are discussed in this article. But they do not consider the effect of the optical losses in the high-transparancy region.

TL;DR: In this article, the mode structure of p-Ge far infrared (FIR) lasers is investigated and an external resonator drastically reduces the number of oscillating modes and enlarges the mode spacing.

TL;DR: The first absorption coefficient spectra determined in the region of the fundamental band edge of metal-organic vapour phase grown CdxHg1−xTe (CMT) with x between 0.2 and 0.3 are presented in this paper.

TL;DR: In this paper, the Bruker IFS 113V Fourier transform interferometer was used to measure the reflectivity of small single crystals over a broad frequency range, between 10 and 300 K.

TL;DR: In this article, the authors analyse the onset of the irregularity in the model of a Morse oscillator and discuss the role of statistical or "chaotic" behaviour of the time dependent probability density.

TL;DR: In this paper, a TEA CO 2 laser oscillator combination using saturable intracavity absorbers and a fast CdTe electro-optical switch was used to generate infrared laser pulses of different temporal pulse shape with a length of 2-50 ns and a nominal power of 100-1000 MW.

TL;DR: In this article, the results of the two common methods of phase correction, namely interferogram symmetrization and the Mertz multiplicative procedure, are examined with respect to photoacoustic Fourier Transform Infrared data.