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Cheng Y.,Opt Electronics Institute | Sun B.,Opt Electronics Institute | Liu X.,Opt Electronics Institute | Mi C.-W.,Opt Electronics Institute | And 4 more authors.
Optics Communications | Year: 2014

We present a new method of the mutual injection phase-locked coherent combination of fiber lasers based on corner cube reflector (CCR). The theoretic calculation of phase difference and far-field intensity distribution of coherent beams obtained by the CCR has been carried out on this work. The relation between the far-field optical intensity distribution and the CCR rotation angles is analyzed in the case of mutual injection. The coherent combination experiments of mutual injection phase-locked with two and four fiber lasers are performed. The experimental results reveal that the far-field intensity distribution in the two free running fiber lasers is good agreement with the theoretical calculation. In the two internal mutual injection structures, the coherent combination output power goes up as high as 54 W, and power combined efficiency of more than 90% and fringe contrast about 90% are obtained. The far-field intensity distribution is the same as the typical coherent combination pattern of two-dimensional fiber laser arrays, the experimental results also show that the coherent combination output with more laser beams and higher power with a good beam quality could be realized by the current scheme. © 2013 Elsevier B.V. Source


Cheng Y.,Opt Electronics Institute | Liu X.,Opt Electronics Institute | Liu Y.,Opt Electronics Institute | Tan C.,Opt Electronics Institute | And 4 more authors.
Applied Optics | Year: 2014

A corner cube (CC) as a peculiar coherent combination element is first, to the best of our knowledge, theoretically and experimentally proved by the authors. When a CC is used as a total-reflecting mirror in the solid-state laser resonator it can improve the laser far-field energy focalization. Furthermore, the differences between the coherent characteristics of the lasers with a corner cube resonator (CCR) and those with a Fabry-Perot resonator have been investigated, respectively. Theoretical calculation and numerical simulation have proved that the symmetric output beams of the CCR laser are coherent and the adjacent output beams are partially coherent. Based on these special coherent characteristics, a new laser coherent combining configuration, in which a CC was utilized as a total-reflecting mirror, was proposed and experimentally investigated. In our experiments, the measured far-field intensity profiles of coherent combing laser arrays are in good agreement with the numerical simulation. These novel coherent characteristics of a CC may be important for applications in solid-state lasers and laser coherent combining systems, and coherent combination may be one of the development trends and future research directions for CCR lasers. © 2014 Optical Society of America. Source

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