Laser is a very important optical tool that has found widespread use in science and industry. The mode characteristics of a laser are important parameters to determine the application scope of the laser. Mode analysis is done through a series of experiments so that various parameters can be obtained to determine how the laser performs against desired specifications. This system is designed to quantitatively assess the mode characteristics of a He-Ne laser. Users may perform laser mode analysis with a computer or observe the mode spectrum on an oscilloscope. This system comes with detailed theoretical and operational descriptions so that experiments can be conducted with ease.