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Side view of capillary edge. The capillary entrance is located at the origin stretching leftwards (not shown here) and in diameter. 20 ns after ablation begins the plasma streams into the vacuum (rightward). Shown in figure (a) is the electron density, and in figure (b) the real part of the plasma induced refractive index.
The ablating laser (red) was focused approximately 3 cm from the capillary entrance. The focused laser (purple) was focused 1 cm before the capillary entrance. The guided pulse was measured at the capillary exit.
Plasma density as function of capillary radius calculated from the Stark broadening. The solid line is the measurement, gray shading represents the error.
Laser beam shape at oscillator exit (a), at the exit of experimental system without plasma lens (b), at experimental system exit with plasma lens (c).
Focused laser train pulse energy as a function of time. The instance of ablating laser hitting the capillary is marked by the dotted line at . Igniting laser yields the intensity increase of guided laser through the capillary by factor of 3.
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