[20a-PA2-1~11] 3.5 Laser system and materials

[20a-PA2-5] Cooperative Stimulated Emission by Spit-Coupled Fluorescent Rings

Ryohei Yagi¹, Atsushi Kubota¹, 〇Mitsunori Saito¹ (1.Ryukoku Univ.)

Keywords:Ring laser, Mode coupling, Stimulated emission

Fluorescent dye was dispersed in rubber rings to create flexible ring lasers whose outer and inner diameters were 2.2 and 0.7 mm, respectively. When these rings were spitted with a glass fiber of 1.0 mm diameter, a stimulated emission beam penetrated into the fiber and emerged from the ends. The ring mode that coupled the fiber mode was not an ordinary WG mode but a torus mode that circulated on both inner and outer surfaces. When multiple rings with a different emission wavelength were spitted together, the stimulated emission took place at the intermediate wavelength due to the coupling between the rings.