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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 7361–7368

Coherent beam combining of high power broad-area laser diode array with a closed-V-shape external Talbot cavity

B. Liu, Y. Liu, and Y. Braiman  »View Author Affiliations


Optics Express, Vol. 18, Issue 7, pp. 7361-7368 (2010)
http://dx.doi.org/10.1364/OE.18.007361


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Abstract

We have coherently combined a high-power broad-area laser diode array by using a feedback loop closed off-axis external Talbot cavity. The off-axis feedback from two gratings provides transverse-mode control of broad-area lasers. The Talbot configuration of the external cavity implements diffractive coupling among laser diodes. Feedback from two gratings increases external cavity quality factor and spectrum selection capability. As a result, spatial coherence was improved and spectral linewidth was narrowed down. The high visibility of the far-field profile indicates that high spatial coherence was achieved. We also observed symmetric far-field profiles indicating that laser array was phase locked to in-phase and out-of-phase super-modes, respectively. Transition between these super-modes was observed by tuning one grating’s tilted angle.

© 2010 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3300) Lasers and laser optics : Laser beam shaping
(140.3410) Lasers and laser optics : Laser resonators
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 3, 2010
Revised Manuscript: March 11, 2010
Manuscript Accepted: March 13, 2010
Published: March 24, 2010

Citation
B. Liu, Y. Liu, and Y. Braiman, "Coherent beam combining of high power broad-area laser diode array with a closed-V-shape external Talbot cavity," Opt. Express 18, 7361-7368 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-7-7361


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