Spectral redshifts in the intense laser-cluster interaction
Ki‐Yong KimInstitute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USAI. AlexeevInstitute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USAThomas M. AntonsenInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USAAnand GuptaInstitute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USAVinod KumarappanInstitute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USAH. M. MilchbergInstitute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
2005en
ABI
Abstract
We study spectral shifts in intense ultrashort laser pulses propagating in clustered gas jets. Forward- and side-scattered laser pulse spectra were measured as a function of pulse width for chirped pulses, and the forward spectrum and absorption were measured for variably delayed colinear $2\ensuremath{\omega}$ probe pulses. The observation of redshifts is consistent with our model of rapidly increasing cluster polarizability early in the laser-heated cluster explosion. In addition, there is a blueshift contribution implying the presence of unclustered atoms in the jet. Simulations of intense pulse propagation in cluster jets are in reasonable agreement with the chirped pulse experiment.
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