1,721,118 research outputs found
Temperature dependence of InSb reflectivity in the far infrared: Determination of the electron effective mass
No full textOptical pumping of CHD2OH and CH2DOH methanol isotopomers by means of a new pulsed CO2 laser: Characterization of new far-infrared laser emissions
No full textWe have reinvestigated CUD2OH and CH2DOH methanol isotopomers as sources of far-infrared laser radiation using the optical pumping technique. A new waveguide pulsed CO2 laser was used, that delivers high peak powers also in the 10-HP CO2 band and has allowed us to observe 19 new far-infrared emissions from CHD2OH and 8 new far-infrared emissions from CH2DOH. Each of them is characterized in wavelength, pump offset from the center of the exciting CO2 line, relative polarization, optimum operating pressure and intensity
Laser Action in Hydrazine: Observation and Characterization of New Large Offset FIR Laser Lines
No full textMEASUREMENTS AND ASSIGNMENTS OF NEW LARGE OFFSET CD3OH FIR LASER LINES
No full textBy using an acoustooptic modulator we extend the 300 MHz tunability of a waveguide CO2 laser to 480 MHz. The CD3OH was optically pumped by the 10R(32), 10R(34), and 10R(36) CO2 laser lines, and 17 new FIR laser lines were discovered. The Stark effect on previously known FIR laser lines was investigated, and some tentative FIR laser lines assignments are suggested
Methanol laser line assignments: Evidence of four-level laser systems
No full textThe "Ritz" computer program, developed for facilitating the assignment of molecular Fourier transform absorption spectra and described in a previous work, determines the energy level values involved in the assigned transitions by the Rydberg-Ritz combination principle. Combining the data obtained from the analyses of high-resolution infrared (IR) and far-infrared (FLR) spectra, it is possible to predict possible FIR laser emissions of molecules. In the present work we have applied this method to the common isotopomer methanol, (CH3)-C-12 (OH)-O-16, and obtained 14 proposed assignments for previously unassigned FIR laser lines. We also predict 15 possible new FIR laser emissions. For the first time, an assignment involving a four-level laser system with collisional population transfer to a slightly higher energy level is reported. (C) 1998 Academic Press
New fir laser lines from CHD2OH methanol
No full textWe have investigated CHD2OH methanol as source of far-infrared (FIR) laser radiation using the optical pumping technique. Our new waveguide pulsed CO2 laser, with peak powers as high as some kW, has allowed us to observe 12 new lines. Each of them is characterized in wavelength, relative polarization, intensity, optimum operating pressure and pump offset from the center of the exciting CO2 line
OPTICAL-PROPERTIES OF YBACUO THIN-FILMS AT FAR-INFRARED MONOCHROMATIC LIGHT
No full textBy using monochromatic sources of radiation we measured the reflectivity and transmission vs temperature behavior of YBaCuO thin film in the Far Infrared region in the range 300-20 K. A smooth change of optical properties is observed from critical temperature down to 40 K with an evident reduction of the losses for all the frequencies we examined. To analyze the use of YBaCuO films as semireflecting elements in submillimeter devices we made a preliminary study of the optical properties of the substrate in the same conditions. The permanence of the sample in a superconducting phase can be deduced from its room-temperature transmittance, as it changes drastically if some degeneracy occurs in the film
(CH3OH)-C-12 and (CH3OH)-C-13 optically pumped by the 10P and 10HP bands of a pulsed CO2 laser: New far-infrared laser emissions and assignments
No full textWe have re-investigated the (CH3OH)-C-12 and the (CH3OH)-C-13 molecules as optically pumped far-infrared laser sources. We have used our new waveguide pulsed-high-peak-power CO2 laser for pumping, finding 20 new far-infrared laser lines emitted by (CH3OH)-C-12 and seven emitted by (CH3OH)-C-13. For each line we report wavelength, pump offset from the center of the exciting CO2 line, relative polarization, optimum operating pressure and intensity. The LaseRitz program was able to assign one of the new laser systems of (CH3OH)-C-12, involving two new far-infrared laser lines
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