Abstract

Femtosecond pulses with the interpulse periods that are twice the cavity round-trip time accompanied by two decentered ${\mathrm{TEM}}_{00}$ beam spots have been obtained with a self-mode-locked Ti:sapphire laser. By use of two photodiodes to measure the beam spots separately, I found that the pulses occurred at alternate spots on successive round trips. The observation can be explained by the presence of a double-pass cavity mode that reproduces itself after two return transits in an effective confocal resonator along an off-axis path rather than by total mode locking.

© 2001 Optical Society of America

Cavity configurations for soft-aperture Kerr-lens mode locking and multiple-period bifurcations in Ti:sapphire lasers

Ja-Hon Lin, Ming-Dar Wei, Wen-Feng Hsieh, and Hsiao-Hua Wu
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Period doubling of a femtosecond Ti:sapphire laser by total mode locking

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Pulse shortening and spectral broadening by periodic pulse-train amplitude modulation in a self-mode-locked Ti:sapphire laser

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Completely self-starting picosecond and femtosecond Kerr-lens mode-locked Ti:sapphire laser

J.-M. Shieh, F. Ganikhanov, K.-H. Lin, W.-F. Hsieh, and Ci-Ling Pan
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Pulse-resolved measurements of subharmonic oscillations in a Kerr-lens mode-locked Ti:sapphire laser

S. R. Bolton, R. A. Jenks, C. N. Elkinton, and G. Sucha
J. Opt. Soc. Am. B 16(2) 339-344 (1999)