The continuous-wave oscillation of a tunnel ring fiber laser is demonstrated. The high losses encountered in tunneling systems are compensated for by a high-gain amplifying medium from barrier widths for 0 to λ/2 . The experimental observations are in good agreement with a simple theoretical model. This near-field probe system allows one to detect small displacements in the picometer range.
© 2003 Optical Society of America
(140.3510) Lasers and laser optics : Lasers, fiber
(240.7040) Optics at surfaces : Tunneling
(260.6970) Physical optics : Total internal reflection
(280.3420) Remote sensing and sensors : Laser sensors
Christophe Bonnet, Olivier Emile, Dominique Chauvat, Marc Vallet, and Albert Le Floch, "Continuous-wave tunnel ring fiber laser," Opt. Lett. 28, 84-86 (2003)