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Multipass non-collinear optical parametric amplifier for femtosecond pulses
Optics Express
|June 9, 2009
Summary
We successfully recompressed femtosecond pulses using a beta-barium borate crystal. This method achieved pulse durations near the Fourier transform limit for amplified ultrashort laser pulses.
Area of Science:
- Ultrafast optics
- Nonlinear optics
- Laser physics
Background:
- High-energy ultrashort laser pulses are crucial for various scientific applications.
- Achieving pulse durations close to the theoretical limit (Fourier transform limit) is essential for maximizing peak power and temporal resolution.
Purpose of the Study:
- To demonstrate the recompression of high-energy femtosecond pulses.
- To achieve pulse durations near the Fourier transform limit using a specific nonlinear crystal.
Main Methods:
- Utilized a Ti:Sapphire oscillator to generate initial femtosecond pulses.
- Employed a ring multi-pass optical parametric amplifier for pulse amplification.
- Used a beta-barium borate (BBO) crystal for pulse recompression.
- Pumped the optical parametric amplifier with a frequency-doubled Nd:YAG laser.
Main Results:
- Successfully recompressed 4.5 mJ, 30 fs femtosecond pulses.
- Obtained pulse durations that were close to the Fourier transform limit.
- Demonstrated the effectiveness of beta-barium borate crystals for pulse recompression.
Conclusions:
- The demonstrated technique enables the generation of high-energy, temporally compressed femtosecond pulses.
- This method is a viable approach for achieving near-transform-limited pulses for advanced laser systems.
