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Pulse compression based on graded-index rods
Optics Letters
|April 15, 2026
Summary
This study presents a simple platform for femtosecond pulse compression using graded-index (GRIN) rods. The method achieves significant pulse shortening while maintaining excellent beam quality and stability.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Laser Technology
Background:
- Femtosecond pulse compression is crucial for various scientific applications.
- Existing methods often face limitations in robustness, scalability, or beam quality.
- Large-area graded-index (GRIN) rods offer unique optical properties for beam manipulation.
Purpose of the Study:
- To develop a simple and robust platform for femtosecond pulse compression.
- To leverage the self-imaging property of GRIN rods for uniform nonlinear phase accumulation.
- To demonstrate simultaneous pulse compression and beam cleaning capabilities.
Main Methods:
- Utilizing large-area graded-index (GRIN) rods for pulse propagation.
- Employing highly-multimode propagation within the GRIN medium.
- Characterizing compressed pulse duration, beam quality, and spatio-spectral homogeneity.
Main Results:
- Achieved compression of 420 fs pulses to 60 fs duration.
- Demonstrated excellent beam quality and spatio-spectral homogeneity post-compression.
- Showcased simultaneous beam cleaning and pulse compression for complex input beams.
- Confirmed stable performance across varying input beam sizes and positions.
Conclusions:
- GRIN rod compressors offer a stable, robust, and easy-to-use platform for femtosecond pulse compression.
- The self-imaging property enables uniform nonlinear phase accumulation despite multimode propagation.
- This technique is suitable for applications requiring high-quality, compressed ultrashort laser pulses.
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