The main part of our laser-heated floating zone crystal growth furnace RLHZ are five 1000 W diode lasers with wavelength of 1064 nm. The rectangular geometry and size of the laser beams which impact the sample can be changed in a wide range in order to adapt to different sample materials and rod diameters. Beside the configurable laser heating system, one of the most striking features of our RLHZ furnace is the possibility to perform laser-heated  crystal growths at high gas pressure of up to 50 bar.  The composition and pressure of the process atmosphere can be adjusted and controlled precisely with independent mass flow controllers for each gas and an easily automatable pressure regulator. The vacuum turbo pump is connected directly to the process chamber using short and wide-diameter pipes. This ensures good vacuum inside the process chamber. A lot of processes require an inert atmosphere with a low partial pressure of oxygen in order to perform ultra-clean growths.