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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Very compact external cavity diffraction-coupled tapered laser diodes.

I Hassiaoui1, N Michel, G Bourdet

  • 1Alcatel-Thales, 3-5 Laboratoire Route Départementale 128, 91767 Palaiseau, France. imen.hassiaoui@3-5lab.fr

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Researchers achieved high-quality laser beams by coherently coupling a phase-corrected tapered laser diode array using the Talbot effect. This method significantly improved beam divergence, approaching the diffraction limit for laser diode arrays.

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Area of Science:

  • Semiconductor Lasers
  • Optics and Photonics
  • Laser Engineering

Background:

  • Tapered laser diode arrays often suffer from poor beam quality.
  • Maintaining single-emitter beam quality in arrays is crucial for many applications.
  • Coherent combining is a promising technique to improve array performance.

Purpose of the Study:

  • To achieve diffraction-limited beam quality from a tapered laser diode array.
  • To coherently couple a phase-corrected laser diode array using the Talbot effect.
  • To demonstrate the first external Talbot cavity for a corrected tapered laser diode array.

Main Methods:

  • Incorporated a phase-correcting system to improve individual emitter beam quality.
  • Utilized the Talbot effect for coherent coupling of the array elements.
  • Employed an external Talbot cavity for beam combination.

Main Results:

  • Reduced FWHM divergence from 34° to 0.17° (fast axis) and 3.5° to 0.7° (slow axis).
  • Obtained a quasi-monolobe far-field profile with divergence as low as 0.20°.
  • Achieved 787 mW output power under pulsed operation with excellent beam quality.

Conclusions:

  • Coherent coupling of a phase-corrected tapered laser diode array via the Talbot effect is feasible.
  • This technique significantly enhances beam quality, approaching the diffraction limit.
  • Represents a novel approach for high-power, high-quality laser diode sources.