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Short pulse laser train for laser plasma interaction experiments.

J L Kline¹, T Shimada, R P Johnson

¹Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

The Review of Scientific Instruments

|September 4, 2007

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A novel multiframe, high-time resolution pump-probe diagnostic using picosecond laser pulses was developed. This technique enables multiple measurements of evolving physical processes in a single shot, enhancing data acquisition efficiency.

Area of Science:

Laser Physics and Optics
Plasma Physics
Spectroscopy and Diagnostics

Background:

Traditional pump-probe techniques often provide limited temporal resolution or require multiple experimental shots.
Characterizing dynamic physical processes necessitates high-time resolution diagnostic tools.
Chirped Pulse Amplification (CPA) systems are crucial for generating high-intensity ultrashort laser pulses.

Purpose of the Study:

To develop a multiframe, high-time resolution pump-probe diagnostic system.
To enable multiple measurements of plasma evolution within a single experimental shot.
To enhance data acquisition efficiency for dynamic physical processes.

Main Methods:

A diagnostic system generating a train of picosecond laser pulses (approx. ps) was integrated with a chirped pulse amplification (CPA) system.

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A series of high-quality windows were used to create multiple 1054 nm picosecond pulses injected before CPA amplification.

The number of pulses and inter-pulse timing were controlled by adjusting optical elements; pulses were frequency-converted to 527 nm and focused into plasma, measuring stimulated Raman scattering.

Main Results:

The developed system successfully generated a train of picosecond laser pulses.
Each pulse in the train sampled distinct, time-evolving plasma conditions.
This multiframe approach yielded more data per laser shot compared to single-pulse probes.

Conclusions:

The novel multiframe pump-probe diagnostic offers a significant advancement in high-time resolution measurements.
This technique allows for picosecond-resolution sampling of physical process dynamics over hundreds of picoseconds to nanoseconds in a single shot.
Potential applications include detailed studies of rapidly evolving phenomena in physics and other scientific fields.