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Normalized harmonic spectra measured at two different distances, , between laser beam and gas nozzle: , dashed curve; , solid curve. Backing pressure , gas temperature . The inset shows the interaction geometry.
Harmonic cutoff wavelength as a function of temperature (; ).
Harmonic spectra measured at two different temperatures: , solid curve; , dashed curve. Backing pressure , .
Photon yield, , for the 25th harmonic (, ). is the number of photons per light pulse. Open circles: experimental results. Dashed and dashed–dotted lines: fits as power laws of temperature. On the top axis the corresponding values of the Hagena parameter .
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