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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

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In-line Spectral Interferometry in Shortwave-Infrared Laser Filaments in Air.

Xiaoming Ren¹, Yang Wang¹, Zenghu Chang¹

¹Department of Physics and CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 21816, USA.

Physical Review Letters

|December 24, 2019

Summary

This summary is machine-generated.

We found that carrier-envelope phase (CEP) stable laser pulses exhibit robust, CEP-dependent spectral interference in air. This phenomenon allows for precise, single-shot CEP metrology in atmospheric conditions.

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Published on: December 18, 2015

Area of Science:

Nonlinear Optics
Ultrafast Laser Physics
Atmospheric Optics

Background:

Understanding nonlinear light propagation is crucial for advanced optical technologies.
Carrier-envelope phase (CEP) stability is a key parameter in ultrafast laser systems.
Atmospheric propagation of intense laser pulses presents unique challenges and opportunities.

Purpose of the Study:

To investigate the nonlinear propagation dynamics of two-cycle, CEP-stable laser pulses in air.
To explore the influence of CEP on white light generation and spectral characteristics.
To assess the feasibility of CEP metrology in atmospheric environments.

Main Methods:

Experimental propagation of intense, CEP-stable laser pulses (1.7 μm center wavelength, two-cycle duration) in air.
Observation and analysis of the generated visible white light spectrum.
Numerical simulations to elucidate the underlying physical mechanisms, including field clamping.

Main Results:

Observed robust, CEP-dependent spectral interference in the visible spectrum of the generated white light.
Demonstrated insensitivity of the interference effect to significant fluctuations in input pulse energy.
Numerical simulations confirmed rigid clamping of the peak optical field and waveform phase.

Conclusions:

The observed spectral interference provides a reliable method for single-shot, stand-off CEP metrology in the atmosphere.
CEP locking enhances the efficiency of CEP-dependent strong-field processes driven by long-wavelength lasers.
This research opens avenues for advanced atmospheric sensing and laser-driven phenomena.