Spatial-domain interferometer for measuring plasma mirror expansion

Abstract : We present a practical spatial-domain interferometer for characterizing the electronic density gradient of laser- induced plasma mirrors with sub-30-femtosecond temporal resolution. Time-resolved spatial imaging of an intensity- shaped pulse reflecting off an expanding plasma mirror in- duced by a time-delayed pre-pulse allows us to measure characteristic plasma gradients of 10–100 nm with an ex- pansion velocity of 10.8 nm/ps. Spatial-domain interferom- etry (SDI) can be generalized to the ultrafast imaging of nm to μm size laser-induced phenomena at surfaces.
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M Bocoum, F Böhle, A. Vernier, Aurélie Jullien, J. Faure, et al.. Spatial-domain interferometer for measuring plasma mirror expansion. Optics Letters, Optical Society of America, 2015, ⟨10.1364/OL.40.003009⟩. ⟨hal-01229263⟩

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