Abstract
We have demonstrated, for the first time to our knowledge, a coupled tandem optical parametric oscillator (OPO) configuration in which a second OPO is placed within the resonator of the first, , OPO. A significant enhancement in the overall cascaded efficiency of this OPO compared with standard two-stage OPO’s was observed. With a multimode Nd:YAG laser, an overall optical-to-optical efficiency (from to the mid IR) of 5.2% was obtained from operating only times above oscillation threshold. The measured overall slope efficiency was attractively high at 35%. With a single set of mirrors we obtained a broad wavelength-tuning range from 2.7 to .
© 1998 Optical Society of America
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