Accurate pulse shaping of femtosecond lasers using programmable phase-only modulator

Kazuya Takasago, Makoto Takekawa, Fumihiko Kannari, Masahiko Tani, Kiyomi Sakai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)L1430-L1433
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number11 PART A
Publication statusPublished - 1996 Nov 1


  • Femtosecond laser
  • Liquid crystal phase modulator
  • Pulse shaping
  • Simulated annealing

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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