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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 6 — Feb. 20, 2008
  • pp: 746–750

Very compact external cavity diffraction-coupled tapered laser diodes

I. Hassiaoui, N. Michel, G. Bourdet, R. Mc Bride, M. Lecomte, O. Parillaud, M. Calligaro, M. Krakowski, and J.-P. Huignard  »View Author Affiliations


Applied Optics, Vol. 47, Issue 6, pp. 746-750 (2008)
http://dx.doi.org/10.1364/AO.47.000746


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Abstract

To maintain the same beam quality as that of a single emitter and to be close to diffraction limit, we have combined a phase corrected array, emitting at λ = 975 nm , coherently using the Talbot effect. First, to improve the beam quality of the array, a phase correcting system was added. The FWHM divergences of the array (which is approximately the same as that of the single emitter since the emitters within the array are not optically coupled to each other) were reduced from 34 ° to 0.17 ° in the fast axis and from 3.5 ° to 0.7 ° in the slow axis at 6 A . Then, to be close to the diffraction limit, we have combined this corrected array coherently using the Talbot effect. We have obtained a quasi-monolobe slow axis far field profile for the in-phase mode with a central peak divergence of only 0.27 ° at 1.5 A , 315 mW under cw operation, and of only 0.20 ° at 2.5 A , 787 mW under pulsed operation. To our knowledge, this is the first demonstration of coherent coupling of a corrected tapered laser diode array in an external Talbot cavity.

© 2008 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: October 12, 2007
Manuscript Accepted: January 4, 2008
Published: February 15, 2008

Citation
I. Hassiaoui, N. Michel, G. Bourdet, R. Mc Bride, M. Lecomte, O. Parillaud, M. Calligaro, M. Krakowski, and J.-P. Huignard, "Very compact external cavity diffraction-coupled tapered laser diodes," Appl. Opt. 47, 746-750 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-6-746

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