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Light focusing from large refractive indices in ionized air
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Image of FIG. 1.
FIG. 1.

Open-shutter photo of a laser plasma.

Image of FIG. 2.
FIG. 2.

Schematics of the streak diagnostics setup (plant view). The probing beam is the green harmonic of the YAG laser. Key: , harmonic separator; , attenuator; , beam expander; , retroreflector.

Image of FIG. 3.
FIG. 3.

Simplified setup for deflectometry using the interference filter.

Image of FIG. 4.
FIG. 4.

Horizontal streak image (negative).

Image of FIG. 5.
FIG. 5.

Probing beam deflection ( plot) as a function of time. (From a scan of the photo in Fig. 4.) is the plasma onset time. The deflection is measured from the center of the plasma.

Image of FIG. 6.
FIG. 6.

Schematics and parameters of the beam deflection.

Image of FIG. 7.
FIG. 7.

Calculation of the refractive index from Figs. 4 and 5.

Image of FIG. 8.
FIG. 8.

Streak photography (negative) of the probe beam and the plasma. The IR beam is incident from the right.

Image of FIG. 9.
FIG. 9.

plot from the photo in Fig. 8. is the plasma onset time. The deflection is measured from the focus.

Image of FIG. 10.
FIG. 10.

Index of refraction as a function of time calculated from Figs. 8 and 9.

Image of FIG. 11.
FIG. 11.

Streak of the plasma and five probing beams. The main IR beam is incident from the left while the five probes emerge from the page.

Image of FIG. 12.
FIG. 12.

Deviation of the probing beams for the case when they are delayed respect to the IR beam. Left panel: plasma and probing beam streaks; right panel: streak of the probing beams alone.

Image of FIG. 13.
FIG. 13.

Frames of the probing beam taken at (a) , (b) , and (c) difference between them.

Image of FIG. 14.
FIG. 14.

Electric susceptibility (dashed line) and refractive index (solid line) as a function of time for two different focal lengths (5 and ) of the plasma-producing lens. corresponds to the time the plasma appears.


Generic image for table
Table I.

Representative results from streak experiments. The positions are relative to the focal point’s position. Key: , vertical; , horizontal.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Light focusing from large refractive indices in ionized air