EXPERIMENTS AT HIGH TEMPERATURE AND PRESSURE : LASER HEATING THROUGH THE DIAMOND CELL

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Abstract
Quantitative experiments are possible at sustained high pressures and temperatures by means of CW-laser heating through the diamond-anvil cell. Temperatures of 1500 to 5000 K have been reached throughout the 10 to 100 GPa pressure range. Heating is achieved by a focused Nd : YAG laser beam, and temperatures are determined radiometrically with an accuracy of about 200 K. The variation of temperature across the laser-heated spot is derived by means of spatial filtering with a slit that can be scanned. In this way, the melting temperature can be determined either from the temperature observed at the liquid-solid interface or from the peak temperature at which glass is first produced with increasing laser power

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