| Temporal Variations in a CW HF MOPA (Oscillator/Amplifier) |
MAY 88 |
41 pages |
| Authors:
L. H. Sentman; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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 | The experimental and theoretical studies directed toward characterizing the output of a cw HF oscillator/amplifier (MOPA) configuration are summarized. Scale effects when the size of a cw HF chemical laser was reduced by a factor of two were studied experimentally and theoretically. When the saturated gains of the single channel CL I laser and the two channel CL II laser were the same, the CL I power was 70-80% of ... |
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| Computer Simulation of cw HF Chemical Laser Unstable Resonator Performance |
AUG 87 |
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| Authors:
L. H. Sentman; J. O. Gilmore; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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 | Inadequacies in the treatment of the fluid dynamic mixing that were not apparent in Fabry-Perot or stable resonator models were revealed with a wave optics unstable resonator model. The unstable resonator data as a function of resonator size and size of the laser were shown to provide a severe test of a couples, wave optics, chemical kinetic, fluid dynamic model of a chemical laser. A mechanism for the observed time-dependent ... |
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| An Experimental Study of CW HF Chemical Laser Amplifier Performance and Zero Power Gain |
AUG 87 |
122 pages |
| Authors:
L. H. Sentman; P. Theodoropoulos; R. Waldo; T. Nguyen; R. Snipes; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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| The multiline and single-line amplifier performance of a two channel Helios CL II laser was studied. Flow channel aperturing of the input beam was found to cause a significant reduction in the measured amplification ratio. The absorption of the the multiline input beam by SF6 was found to be negligible (<0.5%/cm). Maximum multiline and single line amplification was obtained when the input beam was passed through the amplifier at the ... |
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| Scale Effects in a cw HF Chemical Laser |
SEP 86 |
83 pages |
| Authors:
L. H. Sentman; D. L. Carroll; P. Theodoropoulos; A. Gumus; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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| Scale effects when the size of a cw HF chemical laser was reduced by a factor of two were studied experimentally and theoretically. When the saturated gains of the single channel CL I laser and the two channel CL II laser were the same, the CL I power was 70-80% of the CL II power. This suggests that for only a 25% performance penalty, the size, weight and gas requirements ... |
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| Mass Flow Calibration of the Helios CLI and CLII Laser Control Consoles |
AUG 86 |
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| Authors:
L. H. Sentman; P. Theodoropoulos; A. Gumus; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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| Calibration curves of laser control console pressure versus mass flow rate for the four input species H2, SF6, O2 and He were measured for the single and two channel laser control consoles. Several interesting phenomena were observed. The mass flow meter choked unless placed upstream of the flow control orifice and a laminar to turbulent transition occurred in the flow control orifice. |
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| Nonlinear Interactions between the Pumping Kinetics, Fluid Dynamics and Optical Resonator of cw Fluid Flow Lasers |
DEC 1983 |
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| Authors:
L. H. Sentman; M. H. Nayfeh; ILLINOIS UNIV AT URBANA DEPT OF AERONAUTICAL AND ASTRONAUTICAL ENGINEERING
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| This research is an integrated theoretical and experimental investigation of the nonlinear interactions which may occur between the chemical kinetics, the fluid dynamics and the unstable resonator of a continuous wave fluid flow laser. The objectives of this grant were to measure the frequency and amplitude of the time dependent pulsations in the power spectral output which have been predicted to occur in cw chemical lasers employing unstable resonators to ... |
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| Rotational Nonequilibrium Influences in CW HF/DF Chemical Lasers, |
JUL 1981 |
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| Authors:
S. W. Zelazny; W. L. Rushmore; J. W. Raymonda; M. Subbiah; L. H. Sentman; BELL AEROSPACE TEXTRON BUFFALO NY
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| A theory is presented which considers either rotational equilibrium or nonequilibrium rate processes in continuous wave (CW) hydrogen fluoride (HF) or deuterium fluoride (DF) lasers. The theory is used to predict zero power gain and power spectral distributions and comparisons are made with experimental observations. The DF reaction kinetics model was found to give predictions of zero power gain which were closely correlated with experimental data. However, the HF reaction ... |
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