Direct Observation of Femtosecond Pulse Buildup in a Self-Mode-Locked Laser Using an Intracavity Acoustooptic Modulator.

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  • Kinoshita Shuichi
    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Ito Eiichi
    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Omori Minoru
    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Ueki Shuji
    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

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A new method for observing the pulse buildup process using an intracavity acoustooptic modulator is developed. This method is applicable to most self-mode-locked lasers which require an extra initiation process and has the possibility to be extended to sub 10 fs lasers. Applying this method, we have successfully obtained the three-dimensional representation of the time variation of the autocorrelation trace using the combination of an intensity autocorrelator and a digital oscilloscope. With increasing magnitude of loss, the pulse is found to broaden and show an incoherent nature, indicating that the transition from coherent to incoherent oscillation takes place at a very early stage of the recovery process. We analyze the incoherent state by assuming that several frequency blocks with various phases are generated during the amplification process under an excess gain. The competition among these blocks is considered to result in the establishment of a solitary pulse.

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