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Plasma-mirror frequency-resolved optical gating using a liquid-sheet jet in ultraviolet region
Optics Letters
|July 2, 2019
Summary
We demonstrate plasma-mirror frequency-resolved optical gating (PM-FROG) using a water jet to characterize ultraviolet laser pulses. This method also aids in studying liquid ionization dynamics.
Area of Science:
- Optics and Photonics
- Laser Physics
- Plasma Physics
Background:
- Characterizing ultrashort laser pulses is crucial for understanding nonlinear optical phenomena.
- Traditional methods for ultraviolet (UV) pulse characterization face limitations.
- Plasma mirrors offer a novel approach for nonlinear optical sampling.
Purpose of the Study:
- To demonstrate and validate plasma-mirror frequency-resolved optical gating (PM-FROG) for UV laser pulse characterization.
- To investigate the applicability of PM-FROG for studying ionization dynamics in liquids.
- To analyze the complex reflection coefficient of plasma mirrors based on free electron density.
Main Methods:
- Utilizing a liquid-sheet jet of water as the nonlinear medium for PM-FROG.
- Employing a high-repetition (1 kHz) ultraviolet laser source.
- Reconstructing the PM-FROG trace using the least-squares generalized projections algorithm.
Main Results:
- Successfully characterized the waveform of a 1 kHz UV laser pulse using PM-FROG.
- Retrieved spectral phase data consistent with results from self-diffraction FROG.
- Provided insights into the plasma mirror's complex reflection coefficient dependence on free electron density.
Conclusions:
- PM-FROG is a viable technique for characterizing UV laser pulses.
- The PM-FROG method can be extended to investigate ionization dynamics in liquids.
- This technique offers a new tool for laser pulse analysis and material interaction studies.
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