A novel high-spectral-resolution lidar(HSRL)technique for atmospheric aerosol remote sensing,which uses multi-longitudinal-mode laser as the transmitting light source,is proposed.A field-widened Michelson interferometer(FWMI)is used as the spectral discriminator,and the periodic frequency discrimination characteristic in the process of FWMI designing should match with the mode interval of multi-longitudinal-mode laser to ensure consistent fine spectral discrimination for the return signal from each longitud...