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There are no 'active' components the mode-locked and the pulse follows a preset optical path. In this case, since Nd:YAG laser runs at a repetition rate of 76 MHz while the amplifier runs at 10 Hz, a single mode-locked pulse must be selected from the high rep rate train. This can be accomplished Pockels cell. through the use of a fast optical switch called a This device is only used as a fast shutter here, blocking all but one of the pulses from entering the amplifier chain. A regenerative amplifier differs in that the optical path for the pulse is determined by active components.

For 1_, the fragmentation/ionization channel has only half the yield of the ionization/fragmentation route, yielding an I. signal that decreases as one delays the probe laser. These interfering processes are the most disturbing of the experimental difficulties. Since both pathways involve the same photons, changing the laser powers or the spot size will not change their relative contributions. The relative yields are properties of the molecule itself. Further, while for C_I the temporal profiles for the fragmentation/ionization and ionization/fragmentation pathways are mirror images of each other about time zero, in a molecule with a measurable dissociation lifetime this is no longer true.

However, the injection TFP does reflect a few percent of the horizontal light back toward the Antares again. would set up a cavity with a net gain and cause a rapidbuildup This of unwanted photons. By inserting an extra TFP the losses for this type of path can be increased enough to stop the process described. Another method used to reduce ASE was the placement of irises along Ii', beam path. It was particularly important to hay an iris directly after the Faraday isolator to hide its reflective 5 mm diameter housing from the amplifier and another between the two double pass heads.

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