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Spatial mode cleaning and efficient nonlinear pulse compression to sub-50 fs in a gas-filled multipass cell
Optics Letters
|August 2, 2024
Summary
A novel gas-filled multipass cell (MPC) improved laser beam quality and compressed pulse duration. This spatial filter-free system achieved near-diffraction-limited output from a high-power laser source.
Area of Science:
- Laser Physics
- Optical Engineering
Background:
- High-power ultrafast laser sources require effective spatial mode cleaning.
- Spatial filtering can introduce losses and complexity in laser systems.
Purpose of the Study:
- To demonstrate a gas-filled multipass cell (MPC) for spatial mode cleaning and pulse compression.
- To improve the beam quality of a high-power ultrafast laser source without a spatial filter.
Main Methods:
- Utilized a gas-filled multipass cell (MPC) as a spatial filter.
- Integrated the MPC with a 250 W, 100 kHz, 445 fs Innoslab amplifier laser source.
- Measured beam quality factor (M²) and transmission efficiency.
Main Results:
- Improved the input beam quality factor (M²) from 1.53 to 1.21 (near-diffraction-limited).
- Achieved 96% transmission through the MPC.
- Simultaneously compressed the laser pulse duration to 41 fs.
Conclusions:
- The gas-filled MPC effectively cleans the spatial mode of ultrafast laser sources.
- The MPC serves as an efficient spatial filter, enhancing beam quality with high transmission.
- This method enables simultaneous pulse compression and spatial mode cleaning for high-power lasers.
