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Compact optical frequency comb systems

  • US 9,787,051 B2
  • Filed: 07/08/2014
  • Issued: 10/10/2017
  • Est. Priority Date: 05/27/2011
  • Status: Active Grant
First Claim
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1. A frequency comb laser generating an output pulse train characterized by having a repetition rate and a carrier envelope offset frequency, said frequency comb laser comprising:

  • a mode locked oscillator having a laser cavity comprising a solid-state or a fiber gain medium;

    a saturable absorber to induce passive mode locking, said saturable absorber disposed in said cavity at a first cavity end;

    a pump source for optically pumping said gain medium of said mode locked oscillator; and

    an element disposed external to said gain medium, said element configured as part of said laser cavity and configured as a loss modulator to modulate the loss of said laser cavity;

    wherein said element comprises a material operatively connected to an electrical source, said cavity loss modulation being induced by an electric field generated by said electrical source and applied to said material in such a way as to modulate a reflectivity of said loss modulator,wherein said element is configured as a loss modulator located at said first cavity end and attached to said saturable absorber so as to form an integral loss modulator/saturable absorber structure (LMSA), said loss modulator operably arranged for control of one or both of said repetition rate or said carrier envelope offset frequency of said frequency comb laser,wherein said loss modulator/saturable absorber structure (LMSA) comprises a graphene loss modulator.

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