Maser

A Maser (short for Microwave Amplification by Stimulated Emission of Radiation) is a device that produces highly focused and coherent microwave signals, similar to how a laser creates laser light. It works by energizing atoms or molecules in a medium, causing them to emit microwave photons in sync with each other. When these photons are amplified through a feedback loop, the Maser generates a very stable and precise microwave signal, which is used in advanced scientific research, atomic clocks, and sensitive communication systems. Its high stability and coherence make it crucial for applications requiring extremely accurate frequency standards.