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Optical fiber laser or amplifier including high reflectivity gratings

  • US 5,323,404 A
  • Filed: 11/02/1993
  • Issued: 06/21/1994
  • Est. Priority Date: 11/02/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus comprising an optical device that comprisesa) a length of optical fiber;

  • b) means for introducing pump radiation of wavelength λ

    p into said length of optical fiber;

    c) spaced-apart reflector means that define an optical cavity for radiation of a predetermined wavelength, with the cavity comprising at least a portion of the length of optical fiber;

    wherein the device is adapted for emission of radiation of wavelength λ

    s

    λ

    p from said length of optical fiber;

    characterized in thatd) the pump radiation is continuous wave radiation;

    e) the reflector means comprise at least two pairs of reflectors, associated with each of said reflectors is a center wavelength of a reflection band, the two reflectors of a given pair have essentially the same center wavelength and are spaced apart, such that the reflectors of the given pair define an optical cavity for radiation of wavelength equal to said center wavelength of the reflectors of the given pair; and

    f) associated with said given optical cavity is an added round trip loss for radiation of wavelength equal to said center wavelength, said added round trip loss being at most 1.5 dB.

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