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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 1,
  • Issue 4,
  • pp. 225-227
  • (2003)

A compact Ti:sapphire femtosecond pulse amplifier without stretcher at high repetition rate

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Abstract

We report a simple approach to amplify Ti:sapphire femtosecond pulses to moderate energy levels by a chirped regenerative amplifier. The seed pulses are broaden naturally because of the material dispersion of system components in regenerative cavity. The off-focusing Ti:sapphire crystal avoids effectively the optical damage. It sustains amplification over a wavelength range from 775 nm to more than 810 nm with a birefringent filter and an oscillation bandwidth of 7.7 nm, and produces 2.1 ps chirped output pulse energy of 100 ?J at 1.1-mJ pumping energy. This system shows good performances in stability and efficiency with the benefits of two thin-film polarizers and TEM00 mode pumping laser.

© 2005 Chinese Optics Letters

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