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Spatiotemporal filtering of high harmonics in solids
Optics Letters
|November 2, 2018
Summary
This study demonstrates spatial separation of harmonic radiation contributions from solids interacting with lasers. Filtering in the far field isolates temporal components, yielding collimated harmonics and sub-cycle temporal profiles.
Area of Science:
- Solid-state physics
- Laser-matter interactions
- Quantum optics
Background:
- Harmonic generation in solids is a complex process.
- Understanding the spatial and temporal properties of emitted radiation is crucial.
- Previous studies on gas-phase harmonic generation offer insights into spatial-temporal correlations.
Purpose of the Study:
- To investigate the macroscopic spatial and temporal characteristics of harmonic radiation from a model solid.
- To demonstrate the separation of different temporal contributions to harmonic yield in the spatial domain.
- To analyze the effects of spatial filtering on harmonic radiation properties.
Main Methods:
- Interaction of a model solid with an intense, focused laser beam.
- Analysis of macroscopic spatial and temporal properties of generated harmonic radiation.
- Application of a spatial filter in the far field to separate radiation contributions.
Main Results:
- Different temporal contributions to harmonic yield exhibit distinct spatial divergences.
- Spatial filtering in the far field leads to temporal separation of contributions upon refocusing.
- Refocused radiation shows spatially collimated harmonics, a spectrum with well-resolved peaks, and a sub-cycle time profile.
Conclusions:
- Spatial properties can be used to distinguish temporal contributions in solid-state harmonic generation.
- Far-field spatial filtering offers a method for temporal control and characterization of harmonic radiation.
- The findings pave the way for generating tailored harmonic pulses with sub-cycle temporal structures.
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