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Two-photon ionisation processes of rare-gas atoms produced by a superposition of multiple high order harmonics are studied by using a photoelectron spectroscopy technique. Second-order nonlinearity is confirmed by comparing the intensity-dependent photoelectron yields between the linear and nonlinear processes, and the cross sections of these processes are estimated. We also demonstrate the autocorrelation...
Abstract.The first observation of the amplified spontaneous emission (ASE) from the Rydberg C1+(v=0) state of CO is reported. When the C1+(v=0) state was populated through the two-photon excitation, infrared radiation near 2.0m was ejected in forward as well as backward directions along the laser propagation. The assignment as the C1+(v=0)B1+(v=0) transition was confirmed. Several characteristics...
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