Abstract

We implemented two different experimental setups to probe directly the nonlinear coupling between modes in microchip lasers. We show that, remarkably, the results can be interpreted by use of Lamb’s coupling constant. In an Er, Yb:glass microchip laser, we measured C12=0.80 between longitudinal modes and Cxy=0.95 between orthogonally linearly polarized eigenstates. The high values obtained give some physical insight into the single-frequency operation of such lasers.

© 2000 Optical Society of America

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