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Ultrabroadband flying-focus using an axiparabola-echelon pair
Optics Express
|January 4, 2024
Summary
Researchers developed a controllable ultrabroadband flying focus, decoupling peak intensity from medium velocity. This breakthrough enables extended focal regions for advanced laser-driven secondary sources.
Area of Science:
- Physics
- Optics
- Laser Technology
Background:
- Flying-focus pulses offer revolutionary potential for laser-driven secondary sources.
- Previous methods had limitations in trajectory control and peak intensity duration.
Purpose of the Study:
- To demonstrate a controllable ultrabroadband flying focus.
- To overcome limitations of previous flying-focus techniques.
Main Methods:
- Utilized a nearly achromatic axiparabola-echelon pair for generating the flying focus.
- Employed spectral interferometry with an ultrabroadband superluminescent diode for measurements.
Main Results:
- Successfully measured designed super- and subluminal flying-focus trajectories.
- Demonstrated a nearly transform- and diffraction-limited moving focus over centimeter scales ( >50 Rayleigh ranges).
- Achieved an extended focal region with controllable trajectory.
Conclusions:
- The novel axiparabola-echelon configuration enables controllable ultrabroadband flying focus.
- This technology is well-suited for applications and scalable to high peak powers (>100 TW).
- Paves the way for advancements in laser-driven secondary sources.
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