New Optical Diagnostics for Equation-of-State Experiments on the Janus Laser

We report on the first implementation of both a streaked optical pyrometer (SOP) and nanosecond broadband reflectometry diagnostic for observation of $\sim $Mbar laser-driven dynamic compression experiments on the Janus laser at Lawrence Livermore National Laboratory. Temporally and spatially resolved optical pyrometry has been performed in the visible spectrum to measure self-emission from the sample in parallel with velocimetry and reflectivity measurements. A variety of materials have been investigated under ramp-compression (ICE) and shock-loading conditions with absolute temperatures obtained via a greybody comparison. Furthermore, a nanosecond, time-resolved, broadband reflectivity diagnostic has been successfully demonstrated and is being developed for permanent use in combination with pyrometry for equation-of-state measurements. Results from both diagnostics are discussed for materials including SiO2, diamond, MgSiO3 and MgO.