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Suppression of low-intensity features using second-harmonic generation and amplification.

P M French, D S McCallum

|September 16, 2009

Summary

A new technique using second-harmonic generation and amplification can suppress unwanted prepulses. This method enhances laser pulse contrast, energy, and reduces duration while eliminating amplified spontaneous emission.

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Area of Science:

Laser physics
Nonlinear optics
Quantum electronics

Background:

High-power laser systems often suffer from prepulses that degrade performance.
Amplifier configurations can generate amplified spontaneous emission, reducing pulse quality.
Improving peak-to-satellite contrast is crucial for many laser applications.

Purpose of the Study:

To propose a novel technique for prepulse suppression in laser amplifiers.
To enhance peak-to-satellite contrast ratios in amplified laser pulses.
To simultaneously increase pulse energy and reduce pulse duration while eliminating amplified spontaneous emission.

Main Methods:

Utilizing second-harmonic generation (SHG) for pulse manipulation.
Implementing an amplification scheme incorporating SHG.
Developing a method to eliminate amplified spontaneous emission (ASE).

Main Results:

Demonstrated suppression of prepulses in amplifier configurations.
Achieved enhanced peak-to-satellite contrast ratios.
Successfully increased pulse energies and reduced pulse durations.
Eliminated amplified spontaneous emission from the amplification process.

Conclusions:

The proposed SHG-based technique offers a viable solution for prepulse suppression.
This method provides a comprehensive approach to improving laser pulse characteristics.
The technique has significant implications for high-power laser system development.