24 May 1999 Diode-pumped multipath laser oscillators
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Multipath resonators are well known as optical delay lines. By many zick-zack rays between two mirrors large optical path lengths can be obtained. This passive system can be converted into a laser oscillator by closed ray paths and a Nd:YAG crystal at one mirror. Optical pumping occurs by directly coupled diodes at the reflection points. Very efficient (more than 40% optical/optical) and compact systems up to 20 W, with the beam propagation factor m2 < 3 were generated. Q-switching and internal frequency doubling were also demonstrated. The fundamental physics of this system including the transverse mode-locking at the degeneration points of the resonator was investigated, experimentally and theoretically.
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Juergen Erhard, Juergen Erhard, Holger Laabs, Holger Laabs, Bernd Ozygus, Bernd Ozygus, Horst Weber, Horst Weber, Qincheng Zhang, Qincheng Zhang, } "Diode-pumped multipath laser oscillators", Proc. SPIE 3611, Laser Resonators II, (24 May 1999); doi: 10.1117/12.349262; https://doi.org/10.1117/12.349262

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