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Transverse mode tailoring in a quasi-imaging high-finesse femtosecond enhancement cavity

: Weitenberg, J.; Rußbüldt, P.; Eidam, T.; Pupeza, I.

Postprint (1.3 MByte; PDF; )

Optics Express 19 (2011), No.10, pp.9551-9561
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer 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 fun-damental 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.