MODULATED PROBE BEAM REFLECTION - A NEW TECHNIQUE TO MEASURE HIGH TRANSIENT TEMPERATURES

A new experimental technique which relies on the detection of the ther moreflectance signal has been applied to measure transient high temper ature differences. In contrast to the usual thermoreflectance techniqu e, which is used for the thermal characterization of solids and which is based on a modulated pump beam, we here modulate the probe beam, in order to increase the transient signal-to-noise ratio. Test measureme nts done on samples like Si and Cu show that the thermoreflectance sig nal is linear with the sample surface temperature, even for several hu ndred degree of temperature differences.