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The precision of melting curve measurements using laser-heated diamond anvilcell (LHDAC) is largely limited by the correct and reliable determination ofthe onset of melting. We present a novel image analysis of speckle interferencepatterns in the LHDAC as a way to define quantitative measures which enable anobjective determination of the melting transition. Combined with ourlow-temperature customized IR pyrometer, designed for measurements down to500K, our setup allows studying the melting curve of materials with low meltingtemperatures, with relatively high precision. As an application, the meltingcurve of Te was measured up to~$\rm35\,GPa$. The results are found to be ingood agreement with previous data obtained at pressures up to~$\rm10\,GPa$.

Image analysis as an improved melting criterion in laser-heated diamond anvil cell