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Investigate the earliest stages of laser-induced optical breakdown and plasma development using synchronized, time-resolved Schlieren photography.

October 1, 1968IEEE Journal of Quantum Electronics

A mode-locked laser as a light source for Schlieren photography

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Investigate the earliest stages of laser-induced optical breakdown and plasma development using synchronized, time-resolved Schlieren photography.
Utilized second harmonic radiation from a mode-locked Nd:glass laser as an ultra-fast illumination source for Schlieren imaging.
Synchronized the Nd:glass probe laser with a spark-producing ruby laser using an optically triggered spark gap that controlled an intracavity Pockels cell.
Evaluated plasma formation across four gases (neon, argon, nitrogen, and air) at pressures between 60 and 1520 torr, with peak laser powers of 35 to 300 MW and pulse risetimes of 14 to 24 ns.
Successfully resolved the early spatial development of laser-induced sparks immediately following optical breakdown across all tested gases and pressure regimes.
Demonstrated that axial plasma propagation along the laser beam during the rising edge of the laser pulse follows the dynamics of a traveling ionization-breakdown wave.

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Implication

Experimental study demonstrates early-stage laser spark plasma dynamics in multiple gases, indicating axial motion is driven by an ionization-breakdown wave.

Cite This Study

Alcock et al. (1968) studied this question.

synapsesocial.com/papers/6a90e354c27f1af0e592cf73 https://doi.org/10.1109/jqe.1968.1074956

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Implication

Experimental study demonstrates early-stage laser spark plasma dynamics in multiple gases, indicating axial motion is driven by an ionization-breakdown wave.

A mode-locked laser as a light source for Schlieren photography

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Discussion

Implication

Cite This Study

A mode-locked laser as a light source for Schlieren photography

Key Points

Discussion

Implication

Cite This Study

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