While electrons remain in or closely below the conduction band for over 50 ps in MgO and sapphire, they are trapped deep into the bandgap after only 150 fs in amorphous and crystalline quartz. To determine the onset of the ablation from the surface after intensive laser excitation, the time development of changes in the scattered light from the surface was examined. Experiments were carried out under vacuum conditions. The signal of the scattered light from the probe pulse was detected by means of a long-distance microscope tilted under an angle of 30° and a photomultiplier. The scattered signal for a given delay time between pump and probe pulse was averaged for 10 different single-shot measurements.
|Number of pages||2|
|State||Published - 1998|
|Event||Proceedings of the 1998 Conference on Lasers and Electro-Optics, CLEO - San Francisco, CA, USA|
Duration: 3 May 1998 → 8 May 1998
|Conference||Proceedings of the 1998 Conference on Lasers and Electro-Optics, CLEO|
|City||San Francisco, CA, USA|
|Period||3/05/98 → 8/05/98|