Accurate Pulse Shaping of Femtosecond Lasers Using Programmable Phase-Only Modulator.

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  • Takasago Kazuya
    Department of Electrical Engineering, Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku–ku, Yokohama, Kanagawa 223, Japan
  • Takekawa Makoto
    Department of Electrical Engineering, Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku–ku, Yokohama, Kanagawa 223, Japan
  • Kannari Fumihiko
    Department of Electrical Engineering, Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku–ku, Yokohama, Kanagawa 223, Japan
  • Tani Masahiko
    Kansai Advanced Research Center, Communication Research Laboratory, 588–2 Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Sakai Kiyomi
    Kansai Advanced Research Center, Communication Research Laboratory, 588–2 Iwaoka, Nishi–ku, Kobe 651–24, Japan

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  • Accurate Pulse Shaping of Femtosecond L

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Accurate pulse shaping of femtosecond optical pulses is obtained using a 128-pixel liquid crystal spatial light modulator, which manipulates the spectral phase of the optical frequency components in a Fourier-transformed plane. The spectral phase shifts produced by the modulator can be programmed using a simulated annealing optimization code so as to obtain the desired pulse shapes. Significant improvement in the pulse shaping accuracy is achieved by increasing the number of gray levels in the spectral phase mask to 128. Several examples of pulse shaping operation, including high-repetition-rate pulse trains and asymmetric pulse trains, are described.

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