Continuous wave hydrogen fluoride overtone lasing saturation effects on fundamental gain suppression

Theodoropoulos, P.; Sentman, L. H.; Carroll, David L.; Waldo, R.; Gordon, Shawn J.; Otto, J. W.

doi:10.2514/3.13215

Cited by 4 publications

(2 citation statements)

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“…The reason for this is that the P 1 (7) and P 1 (8) gains almost fill the resonator. 13,14 The amplitude modulations of these oscillations ranged from 17% to 73%. A summary of the periods and amplitudes of the data collected on the M = 2, L = 100 cm confocal unstable resonator with a 5 mm slit and X C : Cx = 5.0 mm, Cc = 4.3 mm is given in Table 1.…”

Section: Experimental Measurement Of Time-dependent Oscillationsmentioning

confidence: 99%

“…P 1 (5) and P 2 (5) lased with significant power in the upstream beam, but not in the downstream beam. The P 2 (5) zero power gain goes into absorption around X C = 5.0 mm, 13,14 which results in P 2 (5) not appearing in the downstream spectra. The total power for this configuration was 9.58 W. Spectra were recorded for several other optical axis locations and scraper mirror slit widths.…”

Section: Experimental Measurement Of Time-dependent Oscillationsmentioning

confidence: 99%

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Experimental Study of Time-Dependent Oscillations in a cw HF Chemical Laser Confocal Unstable Resonator

Mayer

Palla

Sentman

et al. 2005

36th AIAA Plasmadynamics and Lasers Conference

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dependent oscillations are the result of a competition between chemical pumping and radiative deactivation of the upper laser levels of HF due to lasing. The oscillations occur only if the medium is not strongly coupled to the optical fields diffractively or geometrically. Three new experiments were suggested to verify the proposed mechanism by varying the geometric and diffractive coupling of the optical field to the gain medium. 5,6 In this study, the proposed mechanism is tested by performing the three proposed experiments using the UIUC cw HF supersonic chemical laser. Time-dependent oscillations may decrease the average total power that may be extracted from high-energy chemical laser unstable resonators. The need to maximize performance of such systems motivates the study of the time-dependent oscillations.

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Section: Experimental Measurement Of Time-dependent Oscillationsmentioning

confidence: 99%

Section: Experimental Measurement Of Time-dependent Oscillationsmentioning

confidence: 99%

Experimental Study of Time-Dependent Oscillations in a cw HF Chemical Laser Confocal Unstable Resonator

Mayer

Palla

Sentman

et al. 2005

36th AIAA Plasmadynamics and Lasers Conference

View full text Add to dashboard Cite

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LARES: An Artificial Chemical Process Approach for Optimization

Irizarry

2004

Evolutionary Computation

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This article introduces a new global optimization procedure called LARES. LARES is based on the concept of an artificial chemical process (ACP), a new paradigm which is described in this article. The algorithm's performance was studied using a test bed with a wide spectrum of problems including random multi-modal random problem generators, random LSAT problem generators with various degrees of epistasis, and a test bed of real-valued functions with different degrees of multi-modality, discontinuity and flatness. In all cases studied, LARES performed very well in terms of robustness and efficiency.

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