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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 27 — Sep. 20, 1999
  • pp: 5752–5760

Power-Scalable System of Phase-Locked Single-Mode Diode Lasers

Lars Bartelt-Berger, Uwe Brauch, Adolf Giesen, Helmut Huegel, and Hans Opower  »View Author Affiliations


Applied Optics, Vol. 38, Issue 27, pp. 5752-5760 (1999)
http://dx.doi.org/10.1364/AO.38.005752


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Abstract

The direct use of diode lasers for high-power applications in material processing is limited to applications with relatively low beam quality and power density requirements. To achieve high beam quality one must use single-mode diode lasers, however with the drawback of relatively low optical output powers from these components. To realize a high-power system while conserving the high beam quality of the individual emitters requires coherent coupling of the emitters. Such a power-scalable system consisting of 19 slave lasers that are injection locked by one master laser has been built and investigated, with low-power diode lasers used for system demonstration. The optical power of the 19 injection-locked lasers is coupled into polarization-maintaining single-mode fibers and geometrically superimposed by a lens array and a focusing lens. The phase of each emitter is controlled by a simple electronic phase-control loop. The coherence of each slave laser is stabilized by computer control of the laser current and guarantees a stable degree of coherence of the whole system of 0.7. An enhancement factor of 13.2 in peak power density compared with that which was achievable with the incoherent superposition of the diode lasers was observed.

© 1999 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3520) Lasers and laser optics : Lasers, injection-locked

Citation
Lars Bartelt-Berger, Uwe Brauch, Adolf Giesen, Helmut Huegel, and Hans Opower, "Power-Scalable System of Phase-Locked Single-Mode Diode Lasers," Appl. Opt. 38, 5752-5760 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-27-5752


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References

  1. S. O’Brien, A. Schoenfelder and R. J. Lang, “5-W cw diffraction-limited in-GaAs broad-area flared amplifier at 970 nm,” IEEE Photonics Technol. Lett. 9, 1217–1219 (1997).
  2. M. Lurie, “Coherence and its effect on laser arrays,” in Surface Emitting Semiconductor Lasers and Arrays, G. A. Evans, ed. (Academic, Boston, Mass., 1993), pp. 435–443.
  3. G. L. Schuster and J. R. Andrews, “Coherent beam combining: optical loss effects on power scaling,” Appl. Opt. 34, 6801–6805 (1995).
  4. D. Botez, “Monolithic phase-locked semiconductor laser arrays,” in Diode Laser Arrays, D. Botez and D. R. Scifres, eds. (Cambridge U. Press, Cambridge, 1994), pp. 1–67.
  5. J. C. Ehlert, B. Cassarly, S. H. Chakmakjian, J. M. Finlan, K. M. Flood, R. G. Waarts, D. Nam, and D. F. Welch, “Automated phase sensing and control of an external Talbot cavity laser with phase-contrast imaging,” Appl. Opt. 33, 5550–5556 (1994).
  6. J. S. Osinski, D. Mehuys, D. F. Welch, R. G. Waarts, J. S. Major, Jr., K. M. Dzurko, and R. J. Lang, “Phased array of high-power coherent, monolithic flared amplifier master oscillator power amplifiers,” Appl. Phys. Lett. 66, 556–558 (1995).
  7. J. Levy and K. Roh, “Coherent array of 900 semiconductor laser amplifiers,” in Laser Diodes and Applications, K. J. Linden and P. R. Akkapeddi, eds., Proc. SPIE 2382, 58–69 (1995).
  8. W. Wang, K. Nakagawa, S. Sayama, and M. Ohtusu, “Coherent addition of injection-locked high-power AlGaAs diode lasers,” Opt. Lett. 17, 1593–1595 (1992).
  9. L. Berger, U. Brauch, A. Giesen, H. Hügel, H. Opower, M. Schubert, and K. Wittig, “Coherent fiber coupling of laser diodes,” in Laser Diodes and Applications II, K. J. Linden and P. R. Akkapeddi, eds., Proc. SPIE 2682, 39–46 (1996).
  10. R. J. Lang, A. Hardy, R. Parke, D. Mehuys, S. O’Brien, J. Major and D. Welch, “Numerical analysis of flared semiconductor laser amplifiers,” IEEE J. Quantum Electron. 29, 2044–2051 (1993).
  11. R. Lang, “Injection locking properties of a semiconductor laser,” IEEE J. Quantum Electron. 18, 976–983 (1982).
  12. M. Pessa, J. Nappi, P. Savolainen, A. Ovtchinnikov, M. Toivonen, R. F. Murison, and H. M. Asonen, “State-of-the-art aluminum-free 980-nm laser diodes,” in Laser Diodes and Applications II, K. J. Linden and P. R. Akkapeddi, eds., Proc. SPIE 2682, 161–168 (1996).
  13. A. E. Siegman, Lasers (Oxford U. Press, Oxford, 1986), p. 1134.
  14. D. E. N. Davies and S. Kingsley, “Method of phase-modulating signals in optical fibers: application to optical-telemetry systems,” Electron. Lett. 10, 21–22 (1974).
  15. S. Kobayashi and T. Kimura, “Injection locking in AlGaAs semiconductor lasers,” IEEE J. Quantum Electron. 17, 681–689 (1981).
  16. M. Tempus, W. Lüthy, and H. P. Weber, “Coherent recombination of laser beams with interferometrical phase control,” Appl. Phys. B 56, 79–83 (1993).
  17. W. M. Neubert, K. H. Kudielka, W. R. Leeb, and A. L. Scholz, “Experimental demonstration of an optical phased array antenna for laser space communications,” Appl. Opt. 33, 3820–3830 (1994).
  18. M. Born and E. Wolf, Principles of Optics, 6th ed. (Pergamon, Oxford, 1987), p. 503.
  19. B. R. Frieden, “Lossless conversion of a plane laser wave to a plane wave of uniform irradiance,” Appl. Opt. 4, 1400–1403 (1965).

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