Generation of Picosecond Blue Light Pulse by Frequency Doubling of a Gain-Switched GaAlAs Laser Diode Having Saturable Absorber

Jun Ohya, Genji Tohmon, Kazuhisa Yamamoto, Tetsuo Taniuchi, Masahiro Kume

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Picosecond pulse generation of blue light by frequency doubling of a GaAlAs laser diode is reported. High power pulse generation is realized by incorporating gain switching of a laser diode having saturable absorber and frequency doubling in a proton-exchanged MgO:LiNbO3 waveguide. The laser diode having longer saturable absorber can produce optical pulses with higher peak power and narrower pulsewidth. Rate equation analysis verifies these experimental results. It also indicates that there exists an optimum length of saturable absorber for a given current pulse. The proton-exchanged waveguide efficiently frequency-doubles the gain-switched laser diode oscillating in multilongitudinal modes in the ÄŒerenkov radiation scheme. The spectral bandwidth of second harmonic generation for the waveguide is evaluated at about 20 nm. This is wide enough to frequency-double all the multilongitudinal modes of the gain-switched laser diode. Blue light pulse of 7.88 mW maximum peak power and 28.7 ps pulse width is obtained for 1.23 W peak pulse of the laser diode.

Original languageEnglish
Pages (from-to)2050-2059
Number of pages10
JournalIEEE Journal of Quantum Electronics
Volume27
Issue number8
DOIs
Publication statusPublished - 1991 Aug

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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