Vol. 32, issue 07, article # 12

Kolosov V. V., Levitsky M. E., Petukhov T. D., Simonova G. V. Formation of feedback loop for phase control of a fiber laser array. // Optika Atmosfery i Okeana. 2019. V. 32. No. 07. P. 591–598. DOI: 10.15372/AOO20190712 [in Russian].
Copy the reference to clipboard

Methods for phasing of an array of radiation channels for coherent combining of linearly polarized fields of narrowband fiber lasers are considered. The high efficiency of operation of the internal feedback loop based on interference of peripheral sections of radiation (Gaussian beam tails) of the phased channels is demonstrated. This method is easy to implement. It allows scaling the power of optical phased arrays and does not require massive optical elements. Equations for calculation of the optical arrangement for implementation of the feedback loop are presented along with the results of experiment on coherent combining of three beams.


fiber laser, optical phased arrays, coherent combining, feedback loop


  1. Bruesselbach H., Wang S., Minden H., Jones D.C., Mangir M. Power-scalable phase-compensation fiber-array transceiver for laser communications through atmosphere // J. Opt. Soc. Am. 2005. V. 22B, N 2. P. 347–353.
  2. Fan T.Y. Laser beam combining for high-power, high-radiance sources // IEEE J. Sel. Top. Quant. Electron. 2005. V. 11, N 3. P. 567–577.
  3. Sprangle P., Hafizi B., Ting A., Fischer R. High-power lasers for direct-energy applications // Appl. Opt. 2015. V. 54, N 31. P. F201–F209.
  4. Vorontsov M.A., Weyrauch T., Beresnev L.A., Carhart G.W., Liu L., Ashenbach K. Adaptive array of phase-locked fiber collimators: Analysis and experimental demonstration // IEEE J. Sel. Top. Quant. Electron. 2009. V. 15, N 2. P. 269–280.
  5. Vorontsov M.A., Lachinova S.L. Laser beam projection with adaptive array of fiber collimators. I. Basic considerations for analysis // J. Opt. Soc. Am. 2008. V. 25A, N 8. P. A1949–A1959.
  6. Shay T.M., Benham V., Baker J.T., Ward B., Sanchez A.D., Culpepper M.A., Pilkington D., Spring J., Nelson D.J., Lu C.A. First experimental demonstration of self-synchronous phase locking of an optical array // Opt. Express. 2006. V. 14, N 25. P. 12015–12021.
  7. Anderegg J., Brosnan S., Cheung E., Epp P., Hamilton D., Komine H., Weber M., Wickham M. Coherently coupled high-power fiber arrays // Proc. SPIE. 2006. V. 6102. P. 61020U-1–5.
  8. Vorontsov M.A., Carhart C.W., Ricklin J.C. Adaptive phase-distortion correction based on parallel gradient-descent optimization // Opt. Lett. 1997. V. 22. P. 907–909.
  9. Bowman D.J., King M.J., Sutton A.J., Wuchenich D.M., Ward R.L., Malikides E.A., McClelland D.E., Shaddock D.A. Internally sensed optical phased array // Opt. Lett. 2013. V. 38, N 7. P. 1137–1139.
  10. Roberts L.E., Ward R.L., Sutton A.J., Fleddermann R., de Vine G., Malikides E.A, Wuchenich D.M., McClelland D.E., Shaddock D.A. Coherent beam combining using 2D internally sensed optiсal phased array // Appl. Opt. 2014. V. 53, N 22. P. 4881–4885.
  11. Vorontsov M.A., Lachinova S.L., Beresnev L.A., Weyrauch T. Obscuration-free pupil-plane phase locking of a coherent array of fiber collimators // J. Opt. Soc. Am. 2010. V. 27A, N 11. P. A106–A121.
  12. Beresnev L.A., Vorontsov M.A., Weyrauch T., Carhart G., Lachinova S.L., Liu J. Experimental study of phase locking of fiber collimators using internal beam-tail interference // Proc. SPIE. 2011. V. 7914. 11 p.
  13. Rostov A.P. Kontroller formirovatelya fazovogo fronta mnogokanal'nogo lazernogo puchka // Optika atmosf. i okeana. Fiz. atmosfery: Materialy XXIII Mezhdunar. simpoz. [Elektronnyj resurs – 1 CD-ROM]. Tomsk: Izd-vo IOA SO RAN, 2017. P. B39–B42.
  14. Wagner R.E., Tomlinson W.J. Coupling efficiency of optics in single-mode fiber components // Appl. Opt. 1982. V. 21. P. 2671–2688.