Observation of Zeeman splitting effect in a laser-driven coil

Zeeman splitting effect has been observed in a strong magnetic field generated with a laser-driven coil. The expanding plasma from the coil wire surface concentrated to the center and interacted with the simultaneously generated magnetic field. The Cu I spectral lines at a wavelength of 510.5548 nm, 515.3238 nm and 521.8202 nm have been detected and analyzed in this research. From the splitting of spectral lines, the magnetic field strength at the coil center was estimated to be ~31.4±15.7 T at a laser intensity of ~5.6×1015 W/cm2, which agreed well with the B-dot measurements. Some other plasma parameters of the central plasma disk have also been studied. The temperature was evaluated from Cu I spectral line intensity ratio, while the electron density was estimated due to the stark broadening effect