Axial and conical parametric emissions from potassium atoms under two-photon fs excitation

作者：Pentaris D^*; Efthimiopoulos T; Merlemis N; Vaicaitis V

来源：Applied Physics B: Lasers and Optics , 2010, 98(2-3): 383-390.

DOI：10.1007/s00340-009-3801-8

We report on the emissions near the 5P(3/2,1/2)-4S(1/2) and 4P(3/2,1/2)-4S(1/2) transitions of potassium atoms which are excited by a fs laser beam. The field at the transition 5P(3/2,1/2)-4S(1/2) is mainly the result of a parametric process with an axial profile when the excitation frequency is tuned above resonance and a conical one below resonance. Similar but not identical far-field patterns were also observed for the 4P(3/2,1/2)-4S(1/2) emission. No amplified spontaneous emission was observed for the fs case, in contrast to the ns excitation for the 4P(3/2,1/2)-4S(1/2) transition.

• 出版日期2010-2