Fabrication and Analysis of a Dammann Grating for Coupling Fiber Lasers

Luke A. DeMars, Hung-Sheng Chiang, James Leger University of Minnesota Department of Electrical and Computer Engineering Purpose: The purpose of this project was to fabricate a dammann grating to couple a dual core, double-clad Yitterbium doped fiber laser. Note that the dammann grating not only couples, but also separates the fiber lasers. This effect of coupling and separating effectively completes the resonance cavity of the fiber laser system. This work was done for Professor Leger’s fiber laser lab that hopes to prove that self-phasing in coherently combined fiber lasers is caused by the Kramers Kronig effect. A diagram of the fiber laser system can be found in the appendix under figure A1 [1].