Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Filamentation and α-factor of broad area laser diodes

대면적 레이저 다이오드의 필라멘테이션과 α-factor

  • Han, Il-Ki (Nano Devices Research Center Korea Institute of Science and Technology) ;
  • Her, Du-Chang (Nano Devices Research Center Korea Institute of Science and Technology) ;
  • Lee, Jung-Il (Nano Devices Research Center Korea Institute of Science and Technology) ;
  • Lee, Joo-In (Nanosurface Group, Korea Research Institute of Standards and Science)
  • 한일기 (한국과학기술연구원 나노소자연구센터) ;
  • 허두창 (한국과학기술연구원 나노소자연구센터) ;
  • 이정일 (한국과학기술연구원 나노소자연구센터) ;
  • 이주인 (한국표준과학연구원)
  • Published : 2002.08.01
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Abstract

1.55 ${\mu}m$multi-quantum well (MQW) broad area laser diodes with different linewidth enhancement factors ($\alpha{-factor}$) of 2 and 4 were fabricated. The far-fields of the laser diodes were measured. It was observed that the full width at half maximum (FWHM) of the far-fields and the filamentations were reduced in the laser diodes for which the value of the $\alpha{-factor}$ was small. As injection current increased, the FWHM of the far-field also increased regardless of the a-factor. This phenomenon was explained by reduction of filament spacing as injection current increased.

Linewidth enhancement factor ($\alpha{-factor}$) 값이 2와 4인 두 종류의 1.55${\mu}m$ 다층양자우물(Multi-Quantum Well; MQW) 대면적 레이저 다이오드를 제작하였다. 제작된 레이저 다이오드의 far-field 측정 결과 $\alpha{-factor}$ 값이 4일 때 보다 2인 구조에서 반폭치(Full Width at Half Maximum; FWHM)와 필라멘테이션(filamentation)이 감소되었다. 주입전류의 증가에 따라 두 종류 모두 far-field의 FWHM의 증가 현상이 나타났고 이는 filament spacing이 감소하였기 때문으로 설명된다.

Keywords

References

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