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Development of a nanosecond-laser-pumped Raman amplifier for short laser pulses in plasma
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Image of FIG. 1.
FIG. 1.

(a) Schematic of a Raman cell for seed pulse generation. (b) An output spectrum of the Raman gas cell filled with pumped by a 0.8 J COMET laser pulse. (c) Output energy of the gas cell vs COMET laser energy.

Image of FIG. 2.
FIG. 2.

Experimental setup of counterpropagation geometry.

Image of FIG. 3.
FIG. 3.

Angular profiles of the seed itself and output pulses at three pump intensities in exact counterpropagation geometry.

Image of FIG. 4.
FIG. 4.

Near-counterpropagating setup.

Image of FIG. 5.
FIG. 5.

Output beam profiles (a) and normalized spectra (b) of amplified pulse , the seed pulse itself (seed only), and the thermal Raman (pump only). (a) shows the relative magnitudes of transmitted energy density, while in (b) the spectra are normalized by their own maxima to allow direct comparison.

Image of FIG. 6.
FIG. 6.

Amplification vs relative timing between the pump and the seed.

Image of FIG. 7.
FIG. 7.

(a) Observed maximum output energy as a function of seed energy at a pump intensity of . (b) Amplification of a 1.7 mJ seed vs the pump intensity.

Image of FIG. 8.
FIG. 8.

Various rates as a function of temperature.

Image of FIG. 9.
FIG. 9.

A snapshot of the pump, the seed, and the plasma wave in the PIC simulation.

Image of FIG. 10.
FIG. 10.

Temporal evolution of seed amplitude (a), plasma wave amplitude (b) and electron distribution function (c) from PIC simulations. The contour map of is on log scale. (d) Electron phase space at , showing the vortices of trapped particles.

Image of FIG. 11.
FIG. 11.

The spectra of the plasma wave at and , showing the broadening and shift of the plasma wave number.

Image of FIG. 12.
FIG. 12.

Evolution of seed amplitude for a 5 and 0.5 ps seed. The dashed line marks the amplitude of the pump.


Generic image for table
Table I.

List of Raman gases for seed pulse generation.


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Scitation: Development of a nanosecond-laser-pumped Raman amplifier for short laser pulses in plasma