A cavityless laser using cesium cell with 459 nm laser pumping

In this paper, we present a laser scheme without cavity in a 10 cm cesium cell as a potential active optical frequency standard. Since no cavity is applied, the stimulated light is emitted from the atoms directly and the center frequency of output laser light is solely determined by atoms without cavity pulling. The threshold characteristic of the emitted light is measured. This scheme can be used to investigate the relation between stimulated emission and amplified spontaneous emission. It is expected to be further extended to generate other narrow linewidth frequency standard signals.