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COMPACT LASER SOURCE WITH REDUCED SPECTRAL WIDTH

  • US 20110038389A1
  • Filed: 04/24/2008
  • Published: 02/17/2011
  • Est. Priority Date: 04/27/2007
  • Status: Active Grant
First Claim
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1. An external-cavity laser source generating a useful laser beam (Fu) comprising at least one laser diode LD (10) mounted in an extended optical cavity (30, 82) bounded between two reflecting surfaces (92, 48), providing an optical path for a laser beam Fd generated by the laser diode LD, and a mode selection filter (44, 86) in the optical path of the cavity in order to select a resonance mode from a number of resonance modes of the laser beam in the cavity,wherein the extended cavity (82) includes, in its optical path, an optical device (94) comprising a polarizer (100) that lets through 100% of a linear polarization of the beam Fd generated by the laser diode, having a reference polarization angle θ

  • 0 of 0°

    , a polarization rotator (102) that rotates the polarization of the beam (Fc1) leaving the polarizer through a predetermined rotation angle θ

    1, a polarization splitter (104) for splitting the beam (Frt) leaving the polarization rotator, the polarization splitter being inclined in the cavity so that its transmission axis (tt′

    ) is oriented at an angle (−

    θ

    1) of opposite sign to and of the same value as the polarization angle of the beam (Frt) leaving the rotator (102), the optical device preventing a reflection beam (Fretum), namely the reflection of the useful beam (Fu), from returning to the laser diode LD.

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