Coherent beam combining of lasers: toward wavelength versatility and long-range operation compliance

P. Bourdon, R. Chtouki, L. Lombard, A. Liméry, J. Le Gouët, F. Gustave, H. Jacqmin, D. Goular, C. Planchat, A. Durécu
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Abstract

Coherent beam combining (CBC) by active phase control is an efficient technique to power scale fiber laser sources emitting in the near-infrared, between 1 and 2 μm, up to the multi-kilowatt level. Interestingly, it has been demonstrated by our team that CBC could also be used to power scale mid-infrared sources, frequency converters, generating a wavelength between 3 and 5 μm. We present our latest results on coherent combining of continuous-wave highefficiency mid-infrared sources: optical parametric oscillators (OPOs) and detail the difficulties encountered to achieve this combining, as well as the main limitations to efficient operation of CBC in this case. In a second part of this talk, we also present recent results on coherent combining of seven 1.5-μm fiber lasers through active phase control, using frequency-tagging, and operating efficiently on a remote target. A testbed has been designed to combine these 7 lasers on a remote surface, with phase-locking operating through analysis of the optical signal backscattered by the target, in a so-called target-in-the-loop (TIL) experiment. In such TIL configuration, CBC mitigates both laser-amplification-induced and atmospheric turbulence-induced phase fluctuations simultaneously. CBC demonstrated proper operation outdoors, on a target located up to 1 km from the laser and the results from this experimental campaign will be described.
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相干光束组合激光器:波长多功能性和远程操作一致性
采用有源相位控制的相干束合并技术是一种有效的近红外(1 ~ 2 μm)光纤激光源功率放大技术,可达到多千瓦量级。有趣的是,我们的团队已经证明,CBC也可以用于驱动规模中红外源,频率转换器,产生3到5 μm之间的波长。我们介绍了连续波高效中红外光源光学参量振荡器(OPOs)相干组合的最新成果,并详细介绍了实现这种组合所遇到的困难,以及在这种情况下CBC高效运行的主要限制。在本演讲的第二部分,我们还介绍了通过主动相位控制、使用频率标记和在远程目标上有效运行的7个1.5 μm光纤激光器的相干组合的最新结果。在所谓的环中目标(TIL)实验中,设计了一个试验台,将这7种激光器组合在一个远程表面上,通过分析目标的光信号反向散射来锁相操作。在这种TIL结构中,CBC同时减轻了激光放大引起的相位波动和大气湍流引起的相位波动。CBC演示了在距离激光器1公里的室外目标上的正确操作,并将描述该实验活动的结果。
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