Spatial coherence measurements of non-resonant and resonant high harmonics generated in laser ablation plumes
R. A. GaneevBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomZ. AbdelrahmanBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomF. FrankBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomTobias WittingBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomW. A. OkellBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomDavide FabrisBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomC. HutchisonBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomJ. P. MarangosBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United KingdomJ. W. G. TischBlackett Laboratory, Imperial College London 1 , Prince Consort Road, London SW7 2AZ, United Kingdom
2014en
ABI
Annotatsiya
We present measurements of the spatial coherence of the high-order harmonics generated in laser-produced ablation plumes. Harmonics were generated using 4 fs, 775 nm pulses with peak intensity 3 × 1014 W cm−2. Double-slit fringe visibilities in the range of ≈0.6–0.75 were measured for non-resonant harmonics in carbon and resonantly enhanced harmonics in zinc and indium. These are somewhat higher than the visibility obtained for harmonics generated in argon gas under similar conditions. This is attributed to lower time-dependent ionization of the plasma ablation targets compared to argon during the high harmonics generation process.
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