RAMBO-II: Ultrabroadband 50-T Magneto-optical Spectroscopy

The study of a material's optical properties in high magnetic fields is often complicated by the size, construction, and availability of magnets available for optical experiments. The chief aim of the RAMBO: Rice Advanced Magnet with Broadband Optics project is to enable a wide variety of ultrafast and nonlinear spectroscopy measurements not possible or prohibitively difficult in large DC or pulsed magnet systems with the construction of multiple compact, mini-coil-based table-top pulsed magnets with excellent optical access. RAMBO-I has already successfully conducted terahertz ultrafast spectroscopy experiments in pulsed magnetic fields of up to 30 T,[JK1] and RAMBO-II will expand these capabilities by not only increasing the maximum field strength but also widening the spectral range into the midinfrared, near-infrared (NIR), visible (VIS), and extreme ultraviolet (EUV). The centerpieces of the RAMBO-II expansion are a series of 50-T magnets, which will be the strongest known table-top, repetitive pulsed magnets applied to similar experiments. This presentation features the completed NIR/VIS magnet system along with its experimental capabilities, plans for the EUV system to be built in the new year, and preliminary data from the inaugural experiment of RAMBO-II NIR/VIS.