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Controlling attosecond angular streaking with second harmonic radiation.
Hammond, T J,Kim, Kyung Taec,Zhang, Chunmei,Villeneuve, D M,Corkum, P B Optical Society of America 2015 Optics letters Vol.40 No.8
<P>High harmonic generation, which produces a coherent burst of radiation every half cycle of the driving field, has been combined with ultrafast wavefront rotation to create a series of spatially separated attosecond pulses, called the attosecond lighthouse. By adding a coherent second harmonic beam with polarization parallel to the fundamental, we decrease the generating frequency from twice per optical cycle to once. The increased temporal separation increases the pulse contrast. By scanning the carrier envelope phase, we see that the signal is 2π periodic.</P>
Attosecond pulses measured from the attosecond lighthouse
Hammond, T. J.,Brown, Graham G.,Kim, Kyung Taec,Villeneuve, D. M.,Corkum, P. B. Nature Publishing Group, a division of Macmillan P 2016 Nature photonics Vol.10 No.3
<P>The attosecond lighthouse is a method of using ultrafast wavefront rotation with high-harmonic generation to create a series of coherent, spatially separated attosecond pulses. Previously, temporal measurements by photoelectron streaking characterized isolated attosecond pulses created by manipulating the single-atom response(1-4). The attosecond lighthouse, in contrast, generates a series of pulses that spatially separate and become isolated by propagation. Here, we show that ultrafast wavefront rotation maintains the single-atom response (in terms of temporal character) of an isolated attosecond pulse over two octaves of bandwidth. Moreover, we exploit the unique property of the attosecond lighthouse-the generation of several isolated pulses-to measure the three most intense pulses. These pulses each have a unique spectrum and spectral phase.</P>