XUV spectroscopy of laser plasma from molecular coated metal targets

Valeri O. Papanyan; Gagik Ts. Nersisyan; Frank K. Tittel

doi:10.1117/12.366676

21 October 1999 XUV spectroscopy of laser plasma from molecular coated metal targets

Valeri O. Papanyan, Gagik Ts. Nersisyan, Frank K. Tittel

Proceedings Volume 3776, Soft X-Ray Lasers and Applications III; (1999) https://doi.org/10.1117/12.366676
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Metal targets covered by micrometer layers of metal- phthalocyanines are studied here. An increase in EUV yield due to optimized absorption of the laser field is reported. Effects of high-temperature plasma rapid expansion (velocity about 10⁶ cm/s) were observed. Moderate power nanosecond and picosecond neodymium lasers are used to product an incident intensity of 10¹¹ to 10¹³ W/cm² on the targets. The plasma electron density was measured by fitting observed spectral profiles to theoretical profiles. Collisional, Doppler, and Stark broadening mechanisms were considered in the calculations. Our measurement technique makes it possible to determine the electron density and temperature dependence on distances from the target surface from 1 mm (where N_e equals 2.0 (+/- 0.5)10¹⁸ cm^-3 and T_e equals 14 eV are measured for aluminum plasma) up to approximately 5 mm (where N_e <EQ 10¹⁷ cm^-3). Electron temperature was measured by comparing intensities of spectral lines, belonging to the ions having a different degree of ionization. Preliminary experiments show that conversion efficiency for molecular coated targets is greater by a factor of approximately 1.5 than measured from bulk solid metal targets.

Citation Download Citation

Valeri O. Papanyan, Gagik Ts. Nersisyan, and Frank K. Tittel "XUV spectroscopy of laser plasma from molecular coated metal targets", Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); https://doi.org/10.1117/12.366676

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