Optimal pulse compression in long hollow fibers
Tamas Nagy1, Vladimir Pervak, Peter Simon
1Laser-Laboratorium Göttingen eV, Göttingen, Germany. tamas.nagy@llg‑ev.de
Optics Letters
|November 18, 2011
Summary
A 3-meter hollow fiber significantly enhances spectral broadening and pulse compression compared to a 1-meter fiber. This research demonstrates achieving 4.5 fs pulses, showcasing improved performance in laser pulse manipulation.
Area of Science:
- Ultrafast laser science
- Nonlinear optics
- Fiber optics
Background:
- Hollow-fiber based spectral broadening is a key technique for ultrafast laser pulse compression.
- Fiber length is a critical parameter influencing spectral broadening efficiency and transmission.
Purpose of the Study:
- To compare the spectral broadening performance of 1 m and 3 m long hollow fibers.
- To evaluate the impact of fiber length on laser pulse characteristics, including duration and energy.
Main Methods:
- Experimental comparison of spectral broadening using argon-filled hollow fibers of 1 m and 3 m lengths.
- Characterization of input and output laser pulses (wavelength, duration, energy).
- Post-compression of spectrally broadened pulses using chirped mirrors.
Main Results:
- The 3 m hollow fiber demonstrated superior transmission and spectral broadening compared to the 1 m fiber.
- A spectral broadening ratio of 26 was achieved with the 3 m fiber using 71 fs pulses.
- Compressed pulses reached 4.5 fs duration with a compression ratio of 16, limited by chirped mirror performance.
Conclusions:
- Longer hollow fibers (3 m) offer significantly enhanced spectral broadening capabilities.
- The study highlights the potential for achieving ultrashort laser pulses through optimized hollow-fiber configurations.
- Chirped mirror limitations were identified as a factor in achieving the ultimate pulse compression.
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