| 摘要 |
The invention relates to a method and to a setup for detecting and stabilizing a carrier-envelope phase drift of laser pulses by means of spectrally and spatially resolved interferometry. According to the method, a laser pulse train of at least two pulses (1, 2, 3) is directed along a first light path and a second light path that extend between a starting point and an end point and are characterized by different ray paths. One of the pulses travelling in the first light path is taken as reference pulse (2R). A closed light resonator ring (46) is inserted into the second light path, whereby a certain portion of the pulses (1, 2, 3) is circulated back from a second point of the second light path along a light path segment differing from the second light path into a first point of the second light path, wherein the second point is located in the direction of light propagation farther from the starting point and the first point is located in the direction of light propagation nearer to the starting point. Spectrally resolved interference patterns are generated at the end point via interference of the reference pulse (2R) with the whole of the individual pulses (1, 2, 3) travelling through the second point of the second light path towards the end point. The thus obtained interference patterns are imaged by an optical imaging means that is connected to an output of a unit for performing resolution with respect to wavelength arranged at the end point. On the basis of a superimposed image obtained as the superposition of interference images captured, a spectral visibility value is determined. Finally, from a change in the spectral visibility value, the carrier-envelope phase drift of subsequent laser pulses (1, 2, 3) is deduced. |
