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      https://www.ias.ac.in/article/fulltext/sadh/017/03-04/0355-0371

    • Keywords

       

      Surface-emitting lasers; semiconductor lasers

    • Abstract

       

      Various types of surface-emitting semiconductor lasers are reviewed along with their anticipated applications. The recent progress in grating-coupled surface-emitting (GSE) lasers is particularly emphasized. SuchGSE arrays have operated continuously to more than 3 W and pulsed to more than 30 W. They have obtainedCW threshold current densities of under 140 A/cm2 withCW differential quantum efficiencies of 20 to 40% per surface. Linewidths in the 40 MHz range have been obtained with output powers of 100 to 250 mW. The arrays typically consist of 10–30 mutually injection-coupled gain sections with 10 laterally coupled ridge-guided lasers in each gain section. A single GaInAs strained-layer quantum well with a graded index separate confinement heterostructure geometry allows junction down mounting with light emission through the transparent GaAs substrate. A surface relief grating is used for feedback and outcoupling.

    • Author Affiliations

       

      G A Evans1 N W Carlson1 J H Abeles1 Y Narayan1 M Ettenberg1 J K Butler2

      1. David Sarnoff Research Center, Princeton, NJ - 08540-5300, USA
      2. Southern Methodist University, Dallas, TX - 75275, USA
    • Dates

       
  • Sadhana | News

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