Soft x-ray emission from Ar clusters heated by ultrashort laser pulse

Tomas Mocek; Cheon Min Kim; H. J. Shin; Dai Gil Lee; Yong Ho Cha; KyungHan Hong; ChangHee Nam

doi:10.1117/12.425656

23 April 2001 Soft x-ray emission from Ar clusters heated by ultrashort laser pulse

Tomas Mocek, Cheon Min Kim, H. J. Shin, Dai Gil Lee, Yong Ho Cha, KyungHan Hong, ChangHee Nam

Proceedings Volume 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter; (2001) https://doi.org/10.1117/12.425656
Event: 26th European Conference on Laser Interaction with Matter (ECLIM 2000), 2000, Prague, Czech Republic

Abstract

We report soft x-ray spectra produced by the interaction of 25-100 fs laser pulses at an intensity of up to 7 by 10¹⁶ W/cm² with cryogenically cooled Ar gas jet. New spectral lines from Ar⁸⁺, Ar⁹⁺ and Ar¹⁰⁺ charge states appeared with decreasing pre- expansion gas temperature. Nonlinear increase of X-ray line emission from Ar⁷⁺, Ar⁸⁺ and Ar⁹⁺ was observed with cooling, which saturated below certain temperature. The change in x-ray spectrum is attributed to efficient collisional heating and collisional ionization of growing small-to-medium sized Ar clusters from the cooled jet. When the laser pulse was extended to 100 fs we have observed considerably stronger emission on lines from high charge states, such as Ar⁸⁺, Ar⁹⁺ and Ar¹⁰⁺ which suggests that resonance absorption condition could be reached for the 100-fs pulse.

Citation Download Citation

Tomas Mocek, Cheon Min Kim, H. J. Shin, Dai Gil Lee, Yong Ho Cha, KyungHan Hong, and ChangHee Nam "Soft x-ray emission from Ar clusters heated by ultrashort laser pulse", Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); https://doi.org/10.1117/12.425656

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