Open AccessTransverse mode tailoring in a quasi-imaging high-finesse femtosecond enhancement cavity
Author(s) -
Johannes Weitenberg,
Peter Rußbüldt,
Tino Eidam,
Ioachim Pupeza
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.009551
Subject(s) - finesse , optics , femtosecond , harmonics , transverse plane , physics , coupling (piping) , laser , materials science , fabry–pérot interferometer , structural engineering , quantum mechanics , voltage , engineering , metallurgy
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.