Phase-matching-free ultrashort laser pulse characterization from a transient plasma lens

Area of Science:

• Ultrafast optics
• Laser physics
• Nonlinear optics

Background:

• Characterizing ultrashort laser pulses is crucial for many scientific applications.
• Existing methods often require phase-matching, limiting their applicability.
• Ultrafast plasma generation offers a novel medium for pulse manipulation.

Purpose of the Study:

• To present a phase-matching-free technique for ultrashort laser pulse retrieval.
• To demonstrate a method utilizing laser-induced plasma for pulse characterization.
• To enable reliable reconstruction of laser pulse temporal properties.

Main Methods:

• A pump pulse ionizes a rare gas, creating an ultrafast plasma lens.
• A probe pulse's divergence is switched by the plasma lens.
• The spectrum of the diverging probe pulse is measured as a function of pump-probe delay.

Main Results:

• The developed method, PI-FROSt, allows for comprehensive temporal characterization of probe pulses.
• The technique is free of phase-matching constraints and operates at ultrahigh repetition rates.
• High-reliability laser pulse reconstructions were achieved in both near-infrared and ultraviolet spectral ranges.

Conclusions:

• PI-FROSt provides a simple and versatile approach for ultrashort pulse retrieval.
• The method's phase-matching-free nature broadens its applicability across different spectral ranges.
• This technique offers a reliable solution for characterizing laser pulses in various configurations.