The helium‐neon laser is utilized in many applications today by scientists and engineers. These applications frequently require a visible amplitude‐stable optical source. Helium‐neon lasers have been shown to have amplitude fluctuations of typically ± 1%. Amplitude stabilization techniques have been previously concerned with mechanical improvements, discharge current regulation, and variable loss modulation. The Zeeman effect of a magnetic field will be shown to control the output power of a helium‐neon laser. A servo feedback system was constructed to demonstrate the ability to stabilize the visible power by reducing power fluctuations from ± 1.0% to ± 0.05%. The Zeeman effect stabilizer overcomes the necessary insertion loss of the current regulation stabilizer. It is also independent of the negative impedance high voltage discharge system.