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High-energy, high-contrast, double-confocal multipass amplifier.
Optics Express
|May 29, 2009
Summary
A novel Ti:sapphire amplifier achieves high-contrast, high-beam-quality pulses. This multipass ring design offers 10 mJ output with 19% efficiency and an intensity contrast of 10^9.
Area of Science:
- Laser physics
- Ultrafast optics
- Materials science
Background:
- Ti:sapphire lasers are crucial for ultrafast science.
- Achieving high pulse energy and contrast simultaneously is challenging.
- Multipass amplifier architectures offer potential for energy scaling.
Purpose of the Study:
- To develop a high-contrast, high-beam-quality Ti:sapphire amplifier.
- To demonstrate a novel double-confocal multipass ring configuration.
- To achieve high output energy and intensity contrast in a single stage.
Main Methods:
- Utilized a double-confocal multipass ring configuration.
- Employed a collimated beam in the gain medium for large mode volume.
- Incorporated optics to correct for aberrations and gain narrowing.
- Integrated an internal saturable absorber for contrast enhancement.
Main Results:
- Generated 10 mJ pulses in a single stage with 19% efficiency.
- Achieved a compressed output beam with an M(2) of 1.15.
- Obtained an intensity contrast of approximately 10^9.
Conclusions:
- The developed Ti:sapphire amplifier provides high performance in a single stage.
- The double-confocal multipass ring design is effective for high-quality amplification.
- This architecture is promising for extending multipass designs to other gain media and higher energies.
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