High dynamic, high resolution and wide range single shot temporal pulse contrast measurement

Area of Science:

• Optics and Photonics
• Laser Physics
• Ultrafast Science

Background:

• Accurate measurement of temporal pulse contrast is vital for ultrafast laser applications.
• Existing methods face limitations in dynamic range, temporal window, or resolution.
• Modern ultra-short pulse lasers require advanced diagnostic tools.

Purpose of the Study:

• To present a novel apparatus for single-shot temporal pulse contrast measurement.
• To enhance the performance of self-referenced spectral interferometry (SRSI) for laser diagnostics.
• To enable simultaneous high dynamic range, temporal window, and resolution.

Main Methods:

• A refinement of the self-referenced spectral interferometry (SRSI) approach.
• Introduction of a spatial delay using tilted beams.
• Analysis with a high-quality imaging spectrometer.
• Demonstration using the PW laser Draco.

Main Results:

• Achieved ~80 dB dynamic range.
• Measured an 18 ps temporal window.
• Attained 18 fs temporal resolution.
• Successfully measured temporal contrast for relativistic laser-solid interactions.
• Enabled quantitative exploration of spatio-temporal coupling, such as pulse front tilt.

Conclusions:

• The novel apparatus offers unprecedented performance for temporal pulse contrast measurement.
• This technique is suitable for characterizing modern ultra-short pulse lasers.
• The method provides critical insights into laser pulse quality for advanced experiments.