Central laser heating facility
Delivery of the optical table (about 250 and 150 kg) on 13.12.2006 and transport into the institute. Thanks to our workshop!
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Test and alignment of the CO2-Laser beam in May 2007.
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The first experiment we carried out in order to demonstrate successful setting-up of our facility was direct conversion of graphite to a transparent phase. A graphite chip was loaded in the DAC. The pressure on the sample was ~12 GPa. The CO2 laser focused in the DAC (pressure medium KBr). The maximal temperature was estimated to be ~1900°C.
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Fig 1: Schematic diagram of the laser-heated diamond anvil cell set-up. M1–M4, Mirrors; BS, Beamsplitter; L1–L5 Focusing lenses
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Fig 2: After heating of graphite with the laser-heated diamond anvil cell set-up at P ~ 12 GPa
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Fig 3-4: Graphite at T ~ 12°C and P ~ 9-12 GPa
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Fig 5-7: Heating of graphite with the laser-heated diamond anvil cell set-up at T ~ 1000°C -1900°C and P ~ 12 GPa
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Fig 8: Raman spectra of the sample in KBr contained in the gasket show peaks from graphite (1583cm-1) and diamond (1332cm-1).
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