R A Joshi
Articles written in Pramana – Journal of Physics
Volume 61 Issue 6 December 2003 pp 1121-1128
Optimization of soft x-ray line emission from laser-produced carbon plasma with laser intensity
A Chowdhury R A Joshi G P Gupta P A Naik P D Gupta
Absolute measurement for He-α resonance (1s21S0−1s2p1
Volume 68 Issue 1 January 2007 pp 43-49 Research Articles
Optimization of C5+ Balmer-𝛼 line intensity at 182 Å from laser-produced carbon plasma
A Chowdhury R A Joshi P A Naik P D Gupta
Parametric dependence of the intensity of 182 Å Balmer-𝛼 line $(C^{5+}; n = 3 \rightarrow 2)$, relevant to xuv soft X-ray lasing schemes, from laser-produced carbon plasma is studied in circular spot focusing geometry using a flat field grating spectrograph. The maximum spectral intensity for this line in space integrated mode occurred at a laser intensity of $1.2 \times 10^{13}$ W cm-2. At this laser intensity, the space resolved measurements show that the spectral intensity of this line peaks at $\sim 1.5$ mm from the target surface indicating the maximum population of C5+ ions $(n = 3)$, at this distance. From a comparison of spatial intensity variation of this line with that of C5+ Ly-𝛼 $(n = 2 \rightarrow 1)$ line, it is inferred that $n = 3$ state of C5+ ions is predominantly populated through three-body recombination pumping of C$^{6+}$ ions of the expanding plasma consistent with quantitative estimates on recombination rates of different processes.
Volume 75 Issue 5 November 2010 pp 869-874 Conributed Papers
M Raghuramaiah R K Patidar R A Joshi P A Naik P D Gupta
Synchronized signal (650 ps) and pump (1.3 ns) pulses were generated using 4-pass geometry in a grating pair based pulse stretcher unit. The pump pulse has been further amplified in a high gain regenerative amplifier. This amplified pulse was used as the pump in an optical parametric chirped pulse amplification based Nd:glass laser system. As the chirped signal pulse and the pump pulse originated from the same oscillator, the time jitter between the pump pulse and the signal pulse can be <50 ps.
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