IEEE Organizations related to Chemical Oxygen Iodine Lasers

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Conferences related to Chemical Oxygen Iodine Lasers

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2020 IEEE International Conference on Plasma Science (ICOPS)

IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.


2012 2nd International Conference on Electronics and Optoelectronics (ICEOE)

1. Electrical Engineering; 2. Electronics; 3. Measurements of Physical Quantities; 4. Computer Science; 5. Control and Automation; 6. Optical Communication and Sensors; 7. Optoelectronic Sensing and Imaging.


2012 4th International Conference on Electronics Computer Technology (ICECT)

ICECT 2012 is the premier forum for the presentation of new advances and research results in the fields of theoretical, experimental, and applied Electronics Computer Technology. The conference will bring together leading researchers, engineers and scientists in the domain of interest from around the world.

  • 2011 3rd International Conference on Electronics Computer Technology (ICECT)

    ICECT 2011 is the premier forum for the presentation of new advances and research results in the fields of theoretical, experimental, and applied Electronics Computer Technology. The conference will bring together leading researchers, engineers and scientists in the domain of interest from around the world.

  • 2010 2nd International Conference on Electronic Computer Technology (ICECT 2010)

    ICECT 2010 is the premier forum for the presentation of technological advances and research results in the fields of Electronic Computer Technology.


2012 Symposium on Photonics and Optoelectronics (SOPO 2012)

Laser Technology and Applications, Optical Sensors, Optical Storage and Technologies, Optoelectronic Devices and Integration, Medical and Biological Applications.



Periodicals related to Chemical Oxygen Iodine Lasers

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Most published Xplore authors for Chemical Oxygen Iodine Lasers

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Xplore Articles related to Chemical Oxygen Iodine Lasers

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Multidisciplinary Coupled Simulation of Supersonic Chemical Oxygen-Iodine Lasers

2012 Symposium on Photonics and Optoelectronics, 2012

The three-dimensional coupled computation of flow field, chemical field and optical field of supersonic chemical oxygen-iodine lasers is realized. Numerical methods are developed to improve the compatibility of multidisciplinary computation and the effectiveness of data communication. The coupled simulation gives detailed information about the three-dimensional mixing flow in the cavity, the diffraction of resonant optical field, the influence of power ...


Optimization of /sub 2/ (/sup 1//spl Delta/) yields in pulsed RF flowing plasmas for chemical oxygen iodine lasers

The 33rd IEEE International Conference on Plasma Science, 2006. ICOPS 2006. IEEE Conference Record - Abstracts., 2006

Summary form only given. Chemical oxygen-iodine lasers (COILs) achieve oscillation on the 2P1/2rarr2P3/2 transition of atomic iodine at 1.315 mum by a series of excitation transfers from O2(1Delta). In conventional COILs, O2(1Delta) is produced by liquid phase chemistry. In electrically excited COILs, (eCOILs) the O2(1Delta) is produced in a flowing plasma, typically He/O2, at a few to 10s torr. One ...


Diode-laser-based absorption spectroscopy diagnostics of a jet-type O/sub 2/(/sup 1//spl Delta/) generator for chemical oxygen-iodine lasers

IEEE Journal of Quantum Electronics, 1999

Using diode-laser-based diagnostics, O/sub 2/(/sup 1//spl Delta/) yield and water vapor fraction were measured at the exit of a jet-type singlet oxygen generator (JSOG) for a chemical oxygen-iodine laser (COIL). Chlorine utilization and gas temperature at the generator exit were also measured, simultaneously. For conditions corresponding to the maximum chemical efficiency of the supersonic COIL energized by the JSOG, the ...


Application of a telescopic resonator to high-power chemical oxygen-iodine lasers

IEEE Journal of Quantum Electronics, 1994

The application of an intraresonator telescope to high-power chemical oxygen- iodine lasers to decrease the output beam divergence is analyzed and demonstrated. A theoretical formula based on the ABCD matrix theory is developed to analyze the characteristics of the telescopic resonator. Calculations are carried out using Galilean type telescopes with magnification factors in the range of two to four, and ...


Scaling of plasma sources for O/sub 2/(/sup 1//spl Delta/) generation for chemical oxygen-iodine lasers

The 31st IEEE International Conference on Plasma Science, 2004. ICOPS 2004. IEEE Conference Record - Abstracts., 2004

Summary form only given. In this paper, results from a computational investigation of the scaling of O/sub 2/(/sup 1//spl Delta/) generation in electric discharges sustained in rare gas/O/sub 2/ mixtures at pressure of a few to 10 s Torr will be discussed. Global, 1-dimensional and 2-dimensional plasma dynamics models were used in this study. Typical configurations use remote flowing cw ...


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Educational Resources on Chemical Oxygen Iodine Lasers

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IEEE-USA E-Books

  • Multidisciplinary Coupled Simulation of Supersonic Chemical Oxygen-Iodine Lasers

    The three-dimensional coupled computation of flow field, chemical field and optical field of supersonic chemical oxygen-iodine lasers is realized. Numerical methods are developed to improve the compatibility of multidisciplinary computation and the effectiveness of data communication. The coupled simulation gives detailed information about the three-dimensional mixing flow in the cavity, the diffraction of resonant optical field, the influence of power extraction upon chemical reacting flow fields, and the intensity and phase distribution of the output beam. The coupled simulation method gives better vision of the physical and chemical processes of COIL and is applicable for the laser performance prediction.

  • Optimization of /sub 2/ (/sup 1//spl Delta/) yields in pulsed RF flowing plasmas for chemical oxygen iodine lasers

    Summary form only given. Chemical oxygen-iodine lasers (COILs) achieve oscillation on the 2P1/2rarr2P3/2 transition of atomic iodine at 1.315 mum by a series of excitation transfers from O2(1Delta). In conventional COILs, O2(1Delta) is produced by liquid phase chemistry. In electrically excited COILs, (eCOILs) the O2(1Delta) is produced in a flowing plasma, typically He/O2, at a few to 10s torr. One method to improve the efficiency of producing O2(1Delta) in eCOILS is by lowering the average value of electron temperature, Te, using spiker-sustainer (S-S) excitation. In the S-S technique a high power pulse (spiker) is followed by a lower power period (sustainer). Excess ionization produced by the spiker enables the sustainer to operate with a lower Te. Previous investigations have suggested that S-S techniques can significantly raise yields of O2 (1Delta). In this paper, we report on results from a 2-dimensional computational investigation of radio frequency excited flowing He/O2 plasmas with emphasis on optimization of the S-S method. The model is a 2-dimensional plasma hydrodynamics simulation encompassing a solution of Navier Stokes equations for neutral flow dynamics. We found that the efficiency of S-S excitation, as measured by the yield of O2(1Delta), depends on a variety of parameters. These parameters include the details of the pulse shape, the carrier frequency, duty cycle (fraction of the S-S cycle for the spiker), S-S frequency (time between spiker pulses), spiker pulse shape and the ratio of spiker to sustainer voltage as well as on pressure. For a given Te, the yield of O2(1Delta) largely depends on the energy deposition per O2 molecule. As a consequence, the yield depends somewhat linearly on O2 mole fraction while the total O2(1Delta) production is less sensitive to O2 mole fraction

  • Diode-laser-based absorption spectroscopy diagnostics of a jet-type O/sub 2/(/sup 1//spl Delta/) generator for chemical oxygen-iodine lasers

    Using diode-laser-based diagnostics, O/sub 2/(/sup 1//spl Delta/) yield and water vapor fraction were measured at the exit of a jet-type singlet oxygen generator (JSOG) for a chemical oxygen-iodine laser (COIL). Chlorine utilization and gas temperature at the generator exit were also measured, simultaneously. For conditions corresponding to the maximum chemical efficiency of the supersonic COIL energized by the JSOG, the O/sub 2/(/sup 1//spl Delta/) yield, water vapor fraction, chlorine utilization, and temperature at the generator exit are 0.65, 0.08 and 0.92, and 30/spl deg/C, respectively. Increase of the basic hydrogen peroxide temperature results in an increase of the water vapor fraction caused by an increase of the saturated water vapor pressure in the generator. As the pressure in the generator rises from 18 to 60 torr, the yield decreases from 0.65 to O.48. Dependence of the yield on the generator pressure is consistent with a rate constant for the O/sub 2/(/sup 1//spl Delta/) energy pooling reaction of 2.7/spl times/10/sup -17/ cm/sup 3//spl middot/S/sup -1/. The same rate constant explains the measured variation of the temperature along the flow in the diagnostic cell.

  • Application of a telescopic resonator to high-power chemical oxygen-iodine lasers

    The application of an intraresonator telescope to high-power chemical oxygen- iodine lasers to decrease the output beam divergence is analyzed and demonstrated. A theoretical formula based on the ABCD matrix theory is developed to analyze the characteristics of the telescopic resonator. Calculations are carried out using Galilean type telescopes with magnification factors in the range of two to four, and our high-power chemical oxygen-iodine laser as an analysis model. By locating the telescope at a proper position on the optical axis, the overall telescopic resonator can be conveniently tailored to the hardware of this model laser in a way that the beam divergence and the resonator stability can be improved simultaneously. Experiments are carried out for one of the conditions used in the calculations. Measured divergence angles are in excellent agreement with the theoretical values.<>

  • Scaling of plasma sources for O/sub 2/(/sup 1//spl Delta/) generation for chemical oxygen-iodine lasers

    Summary form only given. In this paper, results from a computational investigation of the scaling of O/sub 2/(/sup 1//spl Delta/) generation in electric discharges sustained in rare gas/O/sub 2/ mixtures at pressure of a few to 10 s Torr will be discussed. Global, 1-dimensional and 2-dimensional plasma dynamics models were used in this study. Typical configurations use remote flowing cw plasma sources which are compatible with the flow and pressure requirements for the supersonic expansion of the excited gas into the laser cavity. In these configurations we found that O/sub 2/(/sup 1//spl Delta/) was largely a function of the eV/O/sub 2/ molecule deposited in the gas; and optimizes at about 8 eV/molecule for He/O/sub 2/ mixtures. Higher energy deposition results in excessive dissociation and gas heating. Since O/sub 2/(/sup 1//spl Sigma/) can be quenched to O/sub 2/(/sup 1//spl Delta/) in optimized gas mixtures, scalings for the production of the sum of O/sub 2/(/sup 1//spl Sigma/) and O/sub 2/(/sup 1//spl Delta/) may be more relevant. Production of O/sub 2/(/sup 1//spl Delta/) in pulsed plasmas will be compared to cw sources as a means to increase both the energy efficiency and yield of O/sub 2/(/sup 1//spl Delta/).

  • O2(1Δ) production in high pressure flowing He/O2plasmas: scaling and quenching

    Summary form only given. Chemical oxygen-iodine lasers (COILs) achieve oscillation on the2P1/2rarr2P3/2transition of atomic iodine at 1.315 mum by a series of excitation transfers from O2(1Delta). In electrically excited COILs, (eCOILs) the O2(1Delta) is produced in a flowing plasma, typically He/O2, at a few to tens of Torr. Many svstem issues motivate operating eCOILs at higher pressures to obtain larger absolute densities of O2(1Delta) for a given yield and provide higher back pressure for expansion. Obtaining high yields of O2(1Delta) will require careful management of the ozone density [a quencher of O2(1Delta)], gas temperature and discharge stability. In this paper, we discuss results from a computational investigation of O2(1Delta) production in flowing plasmas sustained at moderate pressures (< 50-100 Torr). This investigation was conducted using plug-flow and 2-dimensional models. In this study, we scaled power deposition and flow rates such that if there are not second order effects, yield should be constant and absolute O2(1Delta) production should scale linearly with pressure. We found in many cases that absolute O2(1Delta) production scaled sub-linearly with pressure. Ground state and vibrationally excited ozone are found to be one of the major quenchers of O2(1Delta) and the production of O3is a sensitive function of pressure. Gas heating per molecule increases at high pressures due to exothermic 3-body reactions which reduces O3production, increases O3destruction and, for certain conditions, restores yields. With increasing pressure and increasing absolute densities of atomic oxygen and pooling reactions of O2(1Delta), quenching by these species can become important in the afterglow. The yield of O2(1Delta) is also determined by discharge stability. For the geometries we investigated, discharge constriction becomes problematic at higher pressures, thereby reducing yields.

  • Active Iodine Inlet Control for Improving the Nearfield Intensity Uniformity of COIL

    The potential of using the active iodine inlet control technique for improving the COIL near field intensity uniformity is examined for the first time. The output intensity is detected by an intensity sensor such as an infrared charge coupled device. The detected information is feedback to control the inlet pressure of iodine orifices on the supersonic nozzle. Computer simulation result proved the validity of the proposed method. Filled factor of the near field intensity updated from 0.4 to 0.46 after active iodine inlet control system is applied. The result suggests a effective approach to improve the COIL near field output intensity uniformity.

  • Measurement of Small-Signal Gain on COIL With Chemically Generated Molecular Iodine

    A chemical gas-phase reaction between Cl2 and HI was used in the generation of molecular iodine for the chemical oxygen-iodine laser (COIL) operation. A yield of I2 in the generation reaction up to 85% was achieved in a reasonable volume of the reactor. A small-signal gain up to 0.75%/cm at a temperature of 150 K in the center of supersonic cavity was measured. A comparison with the established evaporation way of I2 delivery confirmed that the chemical method has little or no impact on the COIL pumping kinetics. This chemical method is easily scalable and can simplify the COIL operation by providing better control of I2 flow rate.

  • Supersonic cw chemical oxygen-iodine laser

    Summary form only given. Supersonic continuous wave (cw) chemical oxygen- iodine lasers (COIL) have been studied for many years. By using the rotating disk O/sub 2/ generator and using supersonic gas flow instead of subsonic gas flow in the laser cavity, the laser output power has been improved. We got 5-kW laser output power with Cl flow rate at 0.3 moles/second.

  • Synchronization of dual-line lasing and subsequent gigahertz modulation of iodine lasers through mode locking

    Dual hyperfine line lasing of a Zeeman-tuned photolytic iodine laser resulting in 14-GHz modulated laser radiation was studied experimentally and theoretically as a function of the applied magnetic field. Synchronization of the phases of the two hyperfine lines necessary for optimum gigahertz modulation was achieved by mode locking. The resulting pulse durations of 740 ps were shorter than those previously observed without a magnetic field. Short pulses, together with the possibility of scaling the results to high-power chemical-oxygen iodine lasers, make this concept attractive for a laser-driven ultrawideband microwave source.



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