期刊
OPTICS EXPRESS
卷 19, 期 10, 页码 9551-9561出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.009551
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- Max-Planck-Institut fur Quantenoptik (MPQ)
- Fraunhofer-Institut fur Lasertechnik (ILT)
We demonstrate a high-finesse femtosecond enhancement cavity with an on-axis obstacle. By inserting a wire with a width of 5% of the fundamental mode diameter, the finesse of F = 3400 is only slightly reduced to F = 3000. The low loss is due to the degeneracy of transverse modes, which allows for exciting a circulating field distribution avoiding the obstacle. We call this condition quasi-imaging. The concept could be used for output coupling of intracavity-generated higher-order harmonics through an on-axis opening in one of the cavity mirrors. (C) 2011 Optical Society of America
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