Intensity-resolved above-threshold ionization of xenon with short laser pulses

Abstract

We present intensity-resolved above threshold ionization (ATI) spectra of xenon using an intensity scanning and deconvolution technique. Experimental data were obtained with laser pulses of 58 fs and central wavelength of 800 nm from a chirped-pulse amplifier. Applying a deconvolution algorithm, we obtained spectra that have higher contrast and are in excellent agreement with characteristic 2 and 10 p U cutoff energies contrary to that found for raw data.The retrieved electron ionization probability is consistent with the presence of a second electron from double ionization. This recovered ionization probability is confirmed with a calculation based on the PPT tunneling ionization model [Perelomov, Popov, and Terent'ev, Sov. Phys.JETP 23, 924 (1966)]. Thus, the measurements of photoelectron yields and the proposed deconvolution technique allowed retrieval of more accurate spectroscopic information from the ATI spectra and ionization probability features that are usually concealed by volume averaging.

Selective strong-field enhancement and suppression of ionization with short laser pulses

“…Details of our experimental equipment have been described previously [8]. Briefly, our Ti:sapphire laser system produced 57 fs pulses with a center wavelength of 800 nm.…”

Selective enhancement of resonant multiphoton ionization with strong laser fields

“…It is shown that the intensity-resolved energy and momentum spectra offer a wealth of information about the formation of the ATI. Actually, the intensity-resolved energy or momentum spectrum has been used to investigate the underlying dynamics of single ionization [14,[16][17][18], double ionization [19], and high-order harmonic generation [20]. For single ionization, the intensity-resolved energy spectrum has only studied at comparably large intensities (larger than 3×10 13 W/cm 2 for Xe and larger than 1×10 14 W/cm 2 for H) [14,16,17], at which the nonresonant ionization has a significant contribution.…”

“…Actually, the intensity-resolved energy or momentum spectrum has been used to investigate the underlying dynamics of single ionization [14,[16][17][18], double ionization [19], and high-order harmonic generation [20]. For single ionization, the intensity-resolved energy spectrum has only studied at comparably large intensities (larger than 3×10 13 W/cm 2 for Xe and larger than 1×10 14 W/cm 2 for H) [14,16,17], at which the nonresonant ionization has a significant contribution. Decreasing the laser intensity, the relative contribution of the nonresonant multiphoton ionization decreases [21].…”

Strong-field photoelectron momentum imaging of OCS at finely resolved incident intensities

“…Vast theoretical and experimental efforts are focused on, e.g. the determination of intensity-dependent ionization probabilities [1,2] and cut-off energies for direct and rescattered electrons [2], the recognition of Freeman resonances [3][4][5], the observation of channel-switching and -closing effects [6,7], and the analysis of the photoelectron orbital angular momentum [5,7] in the multi-photon regime as well as the imaging of the initial stateʼs electron density distribution [8][9][10].…”