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class femtosecond optical parametric amplifier for generating soft x-ray harmonics
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Pump intensity dependence of total OPA energy with a -thick BBO. (b) BBO thickness dependence of the total OPA energy at the focusing intensity of .

Image of FIG. 2.
FIG. 2.

Spectra of the injected seed pulse (blue dotted line) and the amplified signal pulse (red solid line). Inset: Measured AC trace (red open circles) and Fourier-transform-limited AC trace from the amplified OPA spectrum (red solid line).

Image of FIG. 3.
FIG. 3.

Typical output energy of OPA 2 vs signal wavelength. The pump intensity at the OPA 2 was adjusted to . Open circles of red, blue, and green correspond to the amplified OPA energy in the case of seed wavelengths of 1.4, 1.3, and , respectively. Red filled circle shows the output energy of signal pulse at a seed pulse of wavelength.

Image of FIG. 4.
FIG. 4.

Experimentally obtained harmonic spectra in Ar. Red and blue profile depict the spectra with pump and pump, respectively. Both HH spectra are normalized to the peak intensity. The laser focused intensity is adjusted to generate HH under a neutral condition for both wavelengths. The inset shows a measured two dimensional harmonic spectrum image driven by pump.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: 10mJ class femtosecond optical parametric amplifier for generating soft x-ray harmonics