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This setup is used to detect the time-dependence of the spontaneous emission of a sample. The sample is excited i.e. bz a short laser pulse (about 100 fs duration) of a Titan-Saphire laser. The emission is detected by a Streak-Scopes . The achived time resolution is about 30 ps. |
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This setup is used to detect the transient absorption bz a sample.
A laser system creates a enery-rich pulse. The pulse is then divided into
two parts.
The first part is used to pump a optical parametric amplifier (OPA), which converts the pump light into a wavelength range from 400-13000 nm (blue lines). This pulse is then delayed with respect to the second part by a delay line (DL) and finally excites (pumps) the sample (Sample). The second part is focused into a Quart-plate (QP) to create white light pulses (yellow lines), which are split into two beams. Both beams are directed towards the sample, where one overlaps with the pump region (probe beam) and the other one not. The intensities of the latter two beams are detected by two photodiods (PD) or a diode array (DA) behind a spectrograph. |