Enhanced generation of VUV radiation by four-wave mixing in mercury using pulsed laser vaporization

Details Enhanced generation of VUV radiation by four-wave mixing in mercury using pulsed laser vaporization Enhanced generation of VUV radiation by four-wave mixing in mercury using pulsed laser vaporization

2007-05-23

arxiv.org/abs/0705.3384v1

Physics

Optics

Scientific paper

10.1007/s00340-007-2782-8

The efficiency of a coherent VUV source at 125 nm, based on 2-photon resonant four-wave mixing in mercury vapor, has been enhanced by up to 2 orders of magnitude. This enhancement was obtained by locally heating a liquid Hg surface with a pulsed excimer laser, resulting in a high density vapor plume in which the nonlinear interaction occurred. Energies up to 5 μJ (1 kW peak power) have been achieved while keeping the overall Hg cell at room temperature, avoiding the use of a complex heat pipe. We have observed a strong saturation of the VUV yield when peak power densities of the fundamental beams exceed the GW/cm2 range, as well as a large intensity-dependant broadening (up to ~30 cm-1) of the two-photon resonance. The source has potential applications for high resolution interference lithography and photochemistry.

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