Sergey Ilyin, Vladimir Buzoverya, Anatoly Adamenkov, Victor Bakshin, Valentin Efremov, David Kochiev, Yuriy Kolobyanin, Vladimir Moiseev, Boris Vyskubenko
First results of experimental and theoretical investigations related to an industrial application of oxygen-iodine laser (COIL) are reported. A developed calculative model determines a transmission factor of a laser emission at a set wavelength depending on the waveguide parameters, focusing system characteristics, and laser emission intensity angular distribution. Carried out investigations concerned with delivery of a laser emission power up to 1.6 kW via industrial quartz waveguides of 0.8- and 1 -mm- diameters and 3 and 10 meters long. It was shown that at optimal parameters of the delivery system the waveguide transmission is virtually independent of the diameter and bending radius and is equal to 0.90±0.02, which is in a good agreement with calculative results. The spatial distribution of the laser intensity at the waveguide input and output was measured. The far-field divergence at the 90%-level of the power was shown to increase approximately by 4 times when the laser emission is propagated through a quartz waveguide with a 800-mkm-diameter core and 3 m long.
KEYWORDS: Gas lasers, Chemical elements, Medicine, Ecology, Control systems, Laser applications, Tunable lasers, Laser metrology, High power lasers, Power supplies
An automatic output-stabilized CO-laser model tunable within a broad spectral range (-300 cm-1) and based on a sealed-off active element with life time approximately 3,000 hours has been created. Such laser find ever expanding applications to solving numerous problem sets in ecology monitoring, medicine, spectroscopy, metrology, nonlinear optics, communication systems, laser chemistry, diagnostics of active media of high-power CO lasers and
other areas.
Boris Vyskubenko, Anatoly Adamenkov, Victor Bakshin, Vladimir Buzoverya, Leonid Vdovkin, Yuri Deryugin, Valentin Efremov, Sergey Ilyin, Vladimir Kalinovskiy, Yuriy Kolobyanin, Vladimir Konovalov, Evgeniy Kudryashov, Vladimir Moiseev, Victor Nickolaev
The paper reports on the experimental investigations into supersonic oxygen-iodine laser (COIL). Study efficiency results of the COIL unit driven by the singlet oxygen generator (SOG) with twisted gas flow (TA-SOG) are given for supersonic iodine- oxygen mixing at a broadly ranged singlet oxygen pressure and buffer gas flowrate. The measurements were performed for variations of the throat sizes and the positions of the iodine injection plane in supersonic nozzle part. The gas pressure at the input of the nozzle unit was varied from 50 to 150 Torr. The chemical efficiency achieved under optimal operational COIL conditions was 33%.
Yuri Savin, L. Goryachev, Anatoly Adamenkov, Yu. Adamenkov, V. Bakshin, V. Buzoverya, B. Vyskubenko, V. Yegorov, S. Ilyin, Yu. Kolobyanin, E. Kudryashov
The work cites the experimental data on a small-scale Microwave Discharge Singlet Oxygen Generator. It was shown that a steady-state moving microwave discharge in the plasmatrone with a coaxial cavity resonator allows obtaining of the (1Δg) singlet oxygen yield of 20-23% at 1-2 Torr pure oxygen.
Yuri Kolobyanin, Anatoly Adamenkov, Victor Bakshin, Leonid Vdovkin, Vladimir Buzoverya, Valentin Efremov, Sergey Ilyin, Vladimir Kalinovsky, Vladimir Konovalov, Ivan Krukovsky, Vladimir Moiseyev, Victor Nickolaev, Boris Vyskubenko
The paper presents data from experimental study and optimization of the iodine gas and singlet oxygen mixing process in a supersonic chemical oxygen- iodine laser (COIL) with a two- dimensional or honeycomb nozzle unit. The iodine concentration and the lasant gain fields inside supersonic flow have been found for a wide range of key parameters.
CO-lasers on the basis of sealed-off active elements (SAE) with an average operational life of ~3000 hours nave a simple design and are cost-effective. They don't need gas blow off and cryogenic equipment, as well as the system of toxic gas evacuation etc. Generally, sealed-off active elements are operated at the temperatures of the cooling agent of 10°C<t<15°C. Cryogenic cooling is impossible for them, so it is interesting to perform optimization of the laser parameters at the tolerable for SAE negative temperatures. There has been performed the research on the basic output parameter of the automated modified CO-laser, which is applicable for research in medicine, ecology, active media and material study and which we described earlier, at negative temperatures of SAE up to t ~-40 °C. These measurements were made using an inexpensive standalone cooling system ("Haake Circulators"). The measurements have shown that both the width of area of spectrum modification and the power of generation at separate lines go up as the degree of cooling grows.
Rather powerful output-stabilized sealed-off cw Co-lasers tunable over lines in a wide spectral range find ever expanding applications to solving numerous problem sets in ecology monitoring, medicine, spectroscopy, metrology, nonlinear optics, communication systems, laser chemistry, diagnostics of active media of high-power CO lasers and other areas. We have created an automatic output-stabilized CO-laser model tunable within a broad spectral range (~300sm-1) and based on a sealed-off (i.e. without need for mixture flow and re-filling) active element. The main model characteristics are: total of lines to be selected for single-wave generation - about 90; tuning order - regular or irregular - to be set manually or under the program guidance and operated by computer; cw power in single strong spectral lin - up to 2,000 mW; possibility to operate both at negative and room temperatures; possibility to operate on isotopically replaced molecule CO; long- lasting output power instability - better than 1%; radiation source structure - with enhanced anti-acoustic resistivity; service life - several thousands of hours (about 3,000- 5,000).
The gains were measured for the lines in the traditional band 0001-1000, 0001-0200, in the second band of the 0002-1001 sequence, and in the hot band 0111- 1110 emitted by the active medium of an electric-discharge carbon-dioxide module. The experimental results were used in a generalized theoretical model to find the translation and vibrational temperatures and the concentration of the active molecules. The Fermi resonance between the 1000 and 0200 did not ensure a Boltzmann distribution of their populations under the conditions in the electric-discharge module. The degree of dissociation of the carbon-dioxide molecules in the discharge did not exceed 22% when the maximum input power density was near 6 W/cm3.
Studying the optimum performance of molecular lasers requires information.on active medium parameters. Those in case of laser are translational and vibrational temperatures T, T1 , T2, T3' , and lasing molecule concentration., n. Vibrational temperatures have previously been determined in series investigations of electro discharge CO—laser active medium234S. But definition of concentration n potentially associated with large errors due to lack of lower laser level's vibrational temperature T1 measurements. Other temperatures have been estimated according to approximate model. As it was theoretically shown6 , to determine the inverse medium parameters without simplification, one should measure the small signal gains for lines of (0001_1000) and (0001_0200) traditional CO2 bands, (0002_1001) second sequence band and (O1'l-ll'O) hot band. Translational and vibrational temperatures and lasing molecule concentration were defined for CO—laser using the small signal gain measurements and theoretical scheme6.
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