High efficiency second harmonic generation of femtosecond laser pulses in dispersion compensated ring cavity

Summary form only given. Generation of high intensity femtosecond light pulses in the UV regime is still a topic of scientific interest. Nowadays ultrashort light pulses down to 10 fs are routinely produced with mode-locked solid state lasers in the near IR, but a shorter wavelength regime can only be reached by frequency conversion. In this paper we report on a novel scheme for second harmonic generation (SHG) of fs pulses with increased efficiency. In order to overcome problems with SHG efficiency and beam quality in case of critical phasematching, we propose a dispersion compensated, synchronously pumped ring resonator. The use of a phase-controlled ring cavity is a well known solution for continuous wave SHG.