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Effect of group delay ripple on picosecond pulse compression schemes
Ian C M Littler1, Libin Fu, Benjamin J Eggleton
1School of Physics, University of Sydney, ARC Center for Ultrahigh-bandwidth Devices for Optical Systems, A28, Sydney, New South Wales, Australia. i.littler@physics.usyd.edu.au
Applied Optics
|August 4, 2005
Summary
Simple fiber Bragg gratings can effectively stretch ultrashort optical pulses for amplification. Simulations reveal specific ripple conditions that enable near-perfect pulse compression, offering favorable operational regimes.
Area of Science:
- Optics and Photonics
- Ultrafast Laser Science
- Fiber Optic Technology
Background:
- Ultrashort optical pulses are crucial for various scientific applications.
- Effective pulse stretching and recompression are essential for high-power laser amplification.
- Dispersive elements like fiber Bragg gratings are commonly used for pulse manipulation.
Purpose of the Study:
- To experimentally demonstrate the effectiveness of simple dispersive fiber Bragg gratings for ultrashort optical pulse stretching.
- To investigate the impact of group delay ripple on pulse compression through simulations.
- To identify operational regimes for optimal pulse compression based on ripple characteristics.
Main Methods:
- Experimental measurements using autocorrelation and frequency-resolved optical gating (FROG).
- Numerical simulations to analyze the effect of group delay ripple on pulse dynamics.
- Development of a figure-of-merit map to delineate favorable operating conditions.
Main Results:
- A fiber Bragg grating with ~10 ps peak-to-peak group delay ripple was shown to effectively stretch ultrashort optical pulses.
- Simulations identified specific regimes where group delay ripple allows for near-perfect pulse compression.
- A contour map illustrating figures of merit indicates optimal regions for pulse manipulation.
Conclusions:
- Simple dispersive fiber Bragg gratings are suitable for stretching ultrashort optical pulses for linear amplification.
- Group delay ripple, within defined magnitude and period ranges, can lead to highly efficient pulse recompression.
- The study provides a guide for selecting operating parameters for effective pulse stretching and compression using fiber Bragg gratings.