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Published on: February 28, 2016
Effect of third-order dispersion on passive mode locking
Optics Letters
|October 3, 2009
Summary
Third-order dispersion broadens mode-locked pulses by introducing chirp. Simulations reveal a resonant sideband that reduces gain, but reducing filter bandwidth can suppress this and narrow the pulse.
Area of Science:
- Optics and Photonics
- Ultrafast Lasers
- Nonlinear Optics
Background:
- Mode-locked lasers generate ultrashort pulses.
- Third-order dispersion (TOD) is a critical parameter affecting pulse characteristics.
- Understanding TOD effects is crucial for controlling pulse width and stability.
Purpose of the Study:
- To analytically and numerically investigate the impact of third-order dispersion on mode-locked pulse width.
- To explore the underlying mechanisms, including chirp and gain effects.
- To examine the influence of resonant sidebands and filter bandwidth.
Main Methods:
- Analytical derivations to model pulse evolution.
- Numerical simulations to observe complex phenomena.
- Parameter variation to study the effect of third-order dispersion and filter bandwidth.
Main Results:
- Pulse width increases monotonically with increasing third-order dispersion due to symmetric chirp.
- Third-order dispersion broadens spectral bandwidth and reduces gain.
- Simulations show a gain-taxing resonant sideband.
- Reducing filter bandwidth suppresses the sideband and narrows the pulse.
Conclusions:
- Third-order dispersion is a primary factor limiting pulse width in mode-locked lasers.
- Resonant sidebands represent an additional loss mechanism.
- Filter bandwidth control offers a method to mitigate sideband effects and optimize pulse characteristics.
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