Abstract
Recent development of plasma diagnostics by laser spectroscopy are reviewed. In paticular, some current studies by use of dye-laser are presented; the method of laser-induced fluorescence (LIF) and beam-probe spectroscopy. A new diagnostic method using both techniques of neutral beam probing and LIF has been developed to measure the spatial electron density distribution. A novel technique to measure the magnetic field is also demonstrated, which is determined from the Zeeman splitting of the LiI resonance line with good time and spatial resolutions.