Spectral-temporal measurement capabilities of third-order correlators

Area of Science:

• High-power laser physics
• Nonlinear optics
• Ultrafast science

Background:

• Characterizing temporal pulse evolution is vital for high-power short-pulse lasers.
• Existing methods often lack spectral sensitivity across the full operational bandwidth.
• Chirped pulse amplification (CPA) systems require precise pulse characterization for optimal performance.

Purpose of the Study:

• To extend scanning third-order correlator measurements to include spectral sensitivity.
• To enable accurate pulse evolution diagnostics within the bandwidth of CPA systems.
• To improve the interpretation of relativistic laser-target interactions.

Main Methods:

• Developed a method incorporating spectral sensitivity into temporal pulse evolution measurements.
• Utilized angle tuning of a third harmonic generating crystal to achieve spectral response.
• Modeled and experimentally validated the spectral response of the diagnostic system.

Main Results:

• Demonstrated spectral sensitivity for temporal pulse evolution measurements.
• Successfully validated the modeling of spectral response via crystal angle tuning.
• Obtained spectrally resolved pulse contrast measurements of a Petawatt laser frontend.

Conclusions:

• Full bandwidth coverage is essential for accurate interpretation of laser-target interactions.
• The presented method enhances diagnostics for high-power short-pulse lasers, particularly CPA systems.
• Improved understanding of spectrally resolved pulse contrast aids in studying relativistic effects on solid targets.