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Strongly dispersive transient Bragg grating for high harmonics.

J P Farrell¹, L S Spector, M B Gaarde

¹Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.

|June 16, 2010

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We demonstrate a novel method using counterpropagating pulses to create a transient Bragg grating in high-harmonic generation media. This technique enables angular dispersion of harmonics with high temporal resolution.

Area of Science:

Quantum optics
Laser physics
Nonlinear optics

Background:

High-harmonic generation (HHG) is a key process for producing extreme ultraviolet and X-ray light.
Controlling the spatial and temporal properties of HHG is crucial for advanced applications.
Existing methods for spectral and spatial control can be complex or limited in resolution.

Purpose of the Study:

To introduce a new method for controlling high-harmonic generation using transient Bragg gratings.
To achieve angular dispersion of generated harmonics with high temporal resolution.
To enable efficient diffraction of a large bandwidth of harmonics.

Main Methods:

Creation of a transient Bragg grating within the HHG medium.
Utilizing two counterpropagating laser pulses to form the grating.

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Analyzing the angular dispersion and temporal characteristics of the diffracted harmonics.

Main Results:

Successfully generated a transient Bragg grating in the HHG medium.
Observed angular dispersion of the high-order harmonics.
Demonstrated that temporal resolution is limited by the source size, not the grating dynamics.

Conclusions:

Transient Bragg gratings offer a powerful new tool for controlling HHG.
This method provides angle-dependent spectral filtering with excellent temporal resolution.
The technique is promising for applications requiring spatially and temporally tailored extreme ultraviolet light.