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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 31218–31228

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

B. Liu and Y. Braiman  »View Author Affiliations


Optics Express, Vol. 21, Issue 25, pp. 31218-31228 (2013)
http://dx.doi.org/10.1364/OE.21.031218


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Abstract

We explored a path of achieving high quality phase-locking of broad-area laser diode (BALD) array that operates at high electrical to optical power conversion efficiency (PCE). We found that (a) improving single transverse mode control for each individual BALD, (b) employing global Talbot optical coupling among diodes, and (c) enhancing strength of optical coupling among diodes are key factors in achieving high quality phase-locking of high power BALD array. Subsequently, we redesigned and improved a V-shaped external Talbot cavity and employed low reflectivity anti-reflection (AR) coated, low-“smile” BALD array to meet these three important requirements. We demonstrated near-diffraction limit far-field coherent pattern with 19% PCE and 95% visibility. The far-field angle (full-width at half-maximum (FWHM)) of center lobe was measured as 1.5 diffraction angular limited with visibility of 99% for 5A injection current and 1.6 diffraction angular limited with visibility of 95% for 14A injection current. Power scaling of diode array is discussed.

© 2013 Optical Society of America

OCIS Codes
(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: October 22, 2013
Revised Manuscript: December 1, 2013
Manuscript Accepted: December 5, 2013
Published: December 11, 2013

Citation
B. Liu and Y. Braiman, "Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency," Opt. Express 21, 31218-31228 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-25-31218


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