Assessment of a Rubidium ESFADOF Edge-Filter as ... - tuprints

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128 5 Discussion of the Experimental Results which explains the hysteresis. This interpretation is corroborated by the theoretical description of Measures [180]. The strong coupling between the pump laser and the laser induced plasma introduces in his coupled rate equation model a source of pseudo-ground state atoms, which posses a considerably reduced ionization energy [185]. 5.3.3 Operation along the Plasma Maintenance Threshold Due to the fact, that the ESFADOF operation is limited by the laser-induced plasma phase of the Rb vapor, it is of particular interest to examine, whether the encountered ESFADOF operational limits can be extended when operating along the plasma maintenance threshold. For that purpose, any increase of the vapor density demands a simultaneously decrease of the pump intensity, in order to guarantee reliable ESFADOF operation and exclude any plasma formation. It is useful to summarize some obtained results: Section 5.2.2 showed, that 387.8(5) mW of injected pump power is enough to induce a plasma inside the Rb vapor cell. The cell temperature was 165 ◦ C and the linear polarized pump beam has been detuned by ∆ν P = −1.78(2) GHz from the center of the D2 pump transition. In addition, Sec. 5.3.1 showed that the induction of the plasma is accompanied by a very distinct hysteresis. Although higher pump intensities are necessary to induce the plasma, far lower ones are enough to maintain it. Reducing the pump intensity below a certain pump threshold results in the recovery of the ESFADOF spectra and the plasma cease to exist. Furthermore, due to the saturation of the 5P 3/2 pump level, Fig. 5.14 and Fig. 5.15 showed that the ESFADOF transmissions do not significantly suffer in magnitude between the recovery point of the ESFADOF spectra and the plasma induction. Hence, these observations allow for a further increase of the vapor cell temperature: As long as the injected pump intensity is limited to this recovery threshold, stable ESFADOF operation can be guaranteed. Figures 5.19–5.20 show ESFADOF spectra beyond a cell temperature of 165 ◦ C. The annotated pump intensities, which are located just at the recovery point of the ESFADOF spectra, i.e. when the plasma suddenly ceases to exist, have been obtained by injecting first of all the maximum available pump power, which always induced a plasma, and afterwards decreasing the pump power. The first data set has been extracted from Fig. 5.13. An examination of these figures reveals the following: 1. When operating slightly below the plasma maintenance threshold, i.e. when the ESFADOF spectra recover, a maximum absolute ESFADOF transmission exists. Precisely speaking, a cell temperature of 179 ◦ C and an injected pump power of 147(2) mW delivers a maximum ESFADOF transmission of 25.01(1)%. This value is the highest so far experimentally demonstrated ESFADOF transmission obtained on the green 5P 3/2 → 8D 5/2 transition. This can be attributed to the increased vapor density.
5.3 ESFADOF Operational Limits 129 Fig. 5.19: 3D representation of the ESFADOF transmission spectra as a function of cell temperature just below the plasma formation pump threshold: The corresponding pump powers are annotated to the black dotted lines, which mark the measured ESFADOF spectra. All other parameters are the same as in Fig. 5.5. The maintenance of the laser-induced plasma can be inhibited by reducing the pump power after increasing the cell temperature. The annotated values mark the recovery point of the ESFADOF spectra. Compared to Fig. 5.5, this procedure increases the maximum achievable ESFADOF transmission up to a maximum value of 25.01(1)% for a cell temperature of 179 ◦ C and an injected pump power of 147 mW. Increasing the temperature further, while simultaneously decreasing the injected pump power, reduces the maximum ESFADOF transmission.
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INSTITUT FÜR ANGEWANDTE PHYSIK TEC
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Abstract Global and local climate c
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Pentru Alexandru şi Florina
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II Contents 4.3 Measurement Unit .
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2 1 Introduction wide sea currents
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2 Remote Sensing of the Water Colum
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2.1 Measurement Principle 7 highly
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2.1 Measurement Principle 9 Fry and
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2.2 System Requirements 11 operatin
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2.2 System Requirements 15 Table 2.
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2.2 System Requirements 17 1. Rayle
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2.2 System Requirements 19 wave. Th
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2.2 System Requirements 21 cent pro
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2.2 System Requirements 23 Fig. 2.6
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2.2 System Requirements 25 Both the
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2.3 Ideal Edge-Filter 27 of the Bri
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2.3 Ideal Edge-Filter 29 respective
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32 3 (Excited State) Faraday Anomal
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Page 129 and 130: Fig. 5.18: Rubidium Grotian energy
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Page 170 and 171: 160 References [10] G.L. Mellor and
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Page 185: Curriculum Vitae Alexandru Lucian P
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178 1 Publications Conference Proce
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Supervised Theses Denise Stang, Wei
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184 1 Danksagung Bei Herrn Arno Wei
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