用脉冲laser蒸发在汞中通过四波混频增强VUV辐射的产生
Enhanced generation of VUV radiation by four-wave mixing in mercury using pulsed laser vaporization
摘要：
在125 nm的相干真空紫外光源的效率，在汞蒸气中的双光子共振四波混频的基础上，已提高了2个数量级。这种增强是通过用脉冲准分子激光局部加热液态汞表面，产生高密度蒸气羽流，其中发生非线性相互作用而获得的。能量高达5 J（1 kW峰值功率），同时保持整个汞电池在室温下，避免使用复杂的热管。我们已经观察到一个强饱和的真空紫外产额时，峰值功率密度的基本光束超过GW/cm 2的范围，以及一个大的强度依赖性的加宽（高达~30 cm-1）的双光子共振。该光源在高分辨率干涉光刻和光化学方面具有潜在的应用价值。
英文摘要：
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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