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Surface emitting laser, surface emitting laser array, optical scanning device, image forming apparatus, optical transmission module and optical transmission system

  • US 8,208,511 B2
  • Filed: 11/13/2008
  • Issued: 06/26/2012
  • Est. Priority Date: 11/14/2007
  • Status: Active Grant
First Claim
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1. A surface emitting laser comprising:

  • an oscillator structure including an active layer;

    semiconductor distribution Bragg reflectors each including plural pairs of a low refractive index layer and a high refractive index layer, the semiconductor distribution Bragg reflectors sandwiching the oscillator structure; and

    a confined structure formed of a selectively-oxidized layer including aluminum, whereinthe selectively-oxidized layer is included as a part of the low refractive index layer of the semiconductor distribution Bragg reflector;

    the low refractive index layer including the selectively-oxidized layer includes first and second layers, the first layer being in contact with at least one side of the selectively-oxidized layer, the second layer being in contact with the first layer; and

    Al content rate in the first layer is lower than the Al content rate in the selectively-oxidized layer and is greater than the Al content rate in the second layer.

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