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

130 5 Discussion of the Experimental Results
Transmission
0.25
0.20
0.15
0.10
0.05
0.00
179°C
177°C
175°C
173°C
165°C
147 mW
161 mW
190 mW
200 mW
270 mW
0.25
185°C
118 mW
Transmission
0.20
0.15
0.10
190°C
96 mW
0.05
0.00
-10 -5 0 5 10
∆ν / GHz
Fig. 5.20: 2D graphical representation of the temperature dependence
of the S-polarization: The experimental parameters are the
same as in Fig. 5.5 and the corresponding cell temperatures
and pump powers are annotated. The plot is splitted for clarity.
The ESFADOF spectra increase when increasing the cell
temperature. A maximum transmission of 25.01(1)% has
been achieved.
2. Increasing the cell temperature further decreases the ESFADOF transmission
spectrum. This effect can be attributed to the limited amount of injected pump
power, which is required to inhibit the plasma induction. In combination with
the increased quenching rates at higher temperatures a decreased 5P 3/2 population
results.
3. When comparing Fig. 5.20 with Fig. 5.6 an overall increase of the ESFADOF
transmission can be observed. This holds even for low pump powers. Specifically,
the spectrum recorded at a cell temperature of 190 ◦ C with a pump power
of 96.3(5) mW reveals a maximum transmission of 16.44(1)%, where the
spectrum recorded at 165 ◦ C with a pump power of 99.5(5) mW offers only
a maximum transmission of 8.95(1)%. This effect can also be attributed to the
significantly increased number density within the interaction volume.
4. The spectra gain in structure when increasing the cell temperature. In particular
the blue shifted peak is affected. This again is a consequence of the
increased confinement of the trapped radiation and its frequency redistribution,
which disperses the injected pump photons over a wide range of the 5P 3/2
sublevels.