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http://hdl.handle.net/11375/17571
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DC Field | Value | Language |
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dc.contributor.advisor | Garside, B. K. | - |
dc.contributor.advisor | Reid, J. | - |
dc.contributor.author | Dang, Chinh | - |
dc.date.accessioned | 2015-06-18T15:32:05Z | - |
dc.date.available | 2015-06-18T15:32:05Z | - |
dc.date.issued | 1979-08 | - |
dc.identifier.uri | http://hdl.handle.net/11375/17571 | - |
dc.description.abstract | <p> The characteristics of small-signal gain in a TE CO₂ laser amplifier are investigated using a new technique based on gain measurements of the sequence, hot and regular CO₂ laser bands. This new technique enables us, for the first time, to determine accurately the rotational and vibrational temperatures characterizing the CO₂ laser system. The gain ratio of the sequence band to the regular band provides a simple and accurate determination of the ν₃ mode vibrational temperature. The variation of this ν₃ mode vibrational temperature with discharge energy enables us to determine the net pumping efficiency to the ν₃ mode levels as a function of input energy. It is found that the ν₃ mode vibrational temperature saturates at high input energy. This saturation sets an upper limit to the gain attainable in TE CO₂ laser amplifiers. Once this saturation occurs, increasing background gas temperature causes a reduction in gain at high input energy. </p> <p> As we can measure all the characteristic temperatures relevant to the gain medium, a comparison between the calculated and experimental gain can be carried out with no adjustable parameters. The result of such a direct comparison confirms both the validity of the conventional "mode temperature" model for CO₂ laser dynamics and the validity of our measurement technique for vibrational temperatures. </p> <p> The results of the present study have shown the existence of a de-excitation mechanism occurring in the discharge, which reduces drastically the pumping efficiency to the ν₃ mode at high discharge energy. It is therefore essential to incorporate such a de-excitation mechanism in the accurate modeling of CO₂ laser dynamics. The present study contributes to a better understanding of CO₂ laser dynamics at high discharge energies. </p> | en_US |
dc.language.iso | en | en_US |
dc.subject | physics | en_US |
dc.subject | gain characteristics | en_US |
dc.subject | TE CO₂ laser amplifier | en_US |
dc.title | Gain Characteristics of TE CO₂ Laser Amplifier | en_US |
dc.contributor.department | Physics | en_US |
dc.description.degreetype | Thesis | en_US |
dc.description.degree | Master of Science (MSc) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Dang_Chinh_1979Aug_MSc.pdf | 23.03 MB | Adobe PDF | View/Open |
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