Absolute spectral distribution of soft X-ray emission from laser produced gold plasma

• Published in: IEEE transactions on plasma science Vol. 29; no. 6; pp. 960 - 964
• Main Authors: Sailaja, S., Naik, P.A., Gupta, P.D.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.2001; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Conversion; Emission; Exact sciences and technology; Gold; Gratings; Laser fusion; Laser-plasma interactions; Lasers; Neodymium; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasma; Plasma applications; Plasma measurements; Plasma x-ray sources; Soft x-rays; Solids; Spectra; Spectral emissivity; X-ray imaging; X-ray lasers; X-rays; Transmission networks; Soft X radiation; Second harmonic; Laser-produced plasma; Spectrometers; Spectral energy distribution; Laser irradiation; Experimental study; Conversion; X ray emission
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/27.974985

Quantitative measurement of spectral distribution of soft X-ray emission from laser produced plasmas and estimation of X-ray conversion efficiency are reported. The X-ray emission from planar gold target irradiated by an Nd:glass laser was recorded using a high resolution transmission grating spectrograph. Spectral distribution of X-ray intensity was derived using calibrated film data and a deconvolution procedure to account for contribution of higher diffraction orders. Results of conversion efficiency per unit solid angle, at a laser intensity of /spl sim/4/spl times/10/sup 12/ W/cm/sup 2/ (/spl lambda//sub L/ = 1.054 /spl mu/m), for 10< /spl lambda/ <80 /spl Aring/ and in the water window spectral region (23< /spl lambda/< 44 /spl Aring/) are presented. A three-fold increase in conversion efficiency was observed for second harmonic laser irradiation (/spl lambda//sub L/ = 0.527 /spl mu/m) at an intensity of 8/spl times/10/sup 12/ W/cm/sup 2/.