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Fast Frequency Shift of Laser Diode by Optical Short Pulse Irradiation

  • Ryoji Ohba
  • Sasono Rahardjo
  • Seiichi Kakuma
  • Norihiko Takahashi
  • Toshiyuki Suzuki
  • Takushi Tanaka
  • Yuichiro Nariyoshi

Abstract

It is possible to modulate frequency of a laser diode (LD) applying an irradiation on its active layer.1 There have been considered several causes for the modulation phenomena. We have already confirmed optical modulation of a LD up to 200 kHz applying sinusoidal power modulated optical beam on the active layer of the LD.2,3 The frequency modulation depth depends on the power of the irradiated optical pulse although it is quite small (- 4.3 × 10-4/ W). The reason of the modulation is reduced to the photo-thermal effect. The upper bound of the modulation frequency is expected, however, higher than 200 kHz due to certain causes other than the photo-thermal effect. In order to explore the upper bound, we carry out an experiment to modulate frequency of a LD, whose wavelength is 780 nm, by irradiating its active layer with a very short laser pulse. Oscillation frequency of the LD may shift due to the fast change of refractive index of the laser material.

Keywords

Laser Diode Active Layer Autocorrelation Function Optical Pulse Spectrum Analyzer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. Ohba, Semiconductor laser modulation and demodulation system, US patent 4,751,477 (1988).Google Scholar
  2. 2.
    R. Ohba, S. Kakuma and I. Uehira, Optically induced light frequency modulation of laser diode, SPIE Proc. 1319:36 (1990).CrossRefGoogle Scholar
  3. 3.
    S. Kakuma, K. Mishima and R Ohba, Frequency control of a laser diode by a photo-thermal effect and its application to control frequency stabilization, Optical Engineering 33:2992 (1994).CrossRefGoogle Scholar
  4. 4.
    W. Kaiser (ed.), Ultrashort Laser Pulses and Applications, Topics in Applied Physics 60, Springer- Verlag, Berlin (1988).Google Scholar
  5. 5.
    T. Okoshi and K. Kikuchi, Frequency stabilization of semiconductor lasers for heterodyne-type optical communication systems, Electron. Lett. 16:179 (1980).CrossRefGoogle Scholar
  6. 6.
    K. M. Evenson, D. A. Jennings, F. R. Petersen and J. S. Wells, Laser frequency measurements: A review, limitations, extension to 197 THz (1.5μm), in: Laser Spectroscopy (3rd ed.), J. L. Hall and J. L. Calsten, ed., Springer-Verlag, Berlin (1977).Google Scholar

Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Ryoji Ohba
    • 1
  • Sasono Rahardjo
    • 1
  • Seiichi Kakuma
    • 1
  • Norihiko Takahashi
    • 1
  • Toshiyuki Suzuki
    • 1
  • Takushi Tanaka
    • 1
  • Yuichiro Nariyoshi
    • 1
  1. 1.Division of Applied Physics, Graduate School of EngineeringHokkaido UniversitySapporo 060Japan

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