Doubled single-frequency Nd:YLF ring laser coupled to a passive nonresonant cavity.

We demonstrate an original solution to obtain a single-frequency ring laser coupled to an external passive nonresonant ring cavity, which plays the role of an optical diode. This system provides more output power than systems with an intracavity unidirectional device. To the best of our knowledge, this work marks the first demonstration of a unidirectional planar ring laser at 1.

Nd:YLF laser at 1.3 microm for calcium atom optical clocks and precision spectroscopy of hydrogenic systems.

We describe single-frequency operation of a diode-pumped Nd:YLF laser in the range 1311.9-1317.2 nm.