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Multi-terawatt chirped pulse optical parametric amplifier with a time-shear power amplification stage
Paweł Wnuk1, Yuriy Stepanenko, Czesław Radzewicz
1Institute of Experimental Physics, Warsaw University, Hoza 69, PL-00-681 Warsaw, Poland.
Optics Express
|August 19, 2009
Summary
We developed a compact optical parametric chirped pulse amplifier system achieving 2 TW power. This novel time-shear technique enhances femtosecond pulse amplification efficiency for scientific applications.
Area of Science:
- Physics
- Optics
- Laser Technology
Background:
- Femtosecond laser systems are crucial for advanced research.
- Achieving high peak power amplification efficiently is a significant challenge.
Purpose of the Study:
- To develop a compact and efficient broadband optical parametric chirped pulse amplifier (OPCPA).
- To amplify femtosecond pulses from a titanium sapphire oscillator to terawatt (TW) power levels.
Main Methods:
- Utilized a two-stage parametric amplification system: a preamplifier and a power booster.
- Implemented a novel 'time shear' technique for improved seed-pump overlap.
- Employed beta-barium borate (BBO) crystals in a noncollinear geometry.
- Pumped both stages using a frequency-doubled nanosecond (ns) Nd:YAG laser.
Main Results:
- Achieved 2 TW peak power amplification of femtosecond pulses.
- Delivered 49 mJ pulses with a 23 fs temporal width.
- Demonstrated an overall conversion efficiency of 10% after pulse compression.
Conclusions:
- The developed OPCPA system is compact, simple, and efficient.
- The time-shear technique significantly enhances amplification efficiency.
- The system provides a powerful tool for scientific research requiring high-energy femtosecond pulses.
