Coherent laser combining in all-fiber feedback format

Yizhuo Zhang; Yan Jin; Zhuo Li; Li Cui; Wenhua Hu

doi:10.1117/12.2324445

9 October 2018 Coherent laser combining in all-fiber feedback format

Yizhuo Zhang, Yan Jin, Zhuo Li, Li Cui, Wenhua Hu

Proceedings Volume 10798, High-Power Lasers: Technology and Systems, Platforms, and Effects II; 107980H (2018) https://doi.org/10.1117/12.2324445
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

A growing number of applications are calling for the compact high energy laser sources. In the last decade, significant progress has been made in the area of solid state lasers especially fiber lasers. The solid state laser is widely used in the processing industry, telecommunication systems at present. However, thermal effect, nonlinear effect and the damage of optical components limits the output power. We present a laser coherent combining technique based on heterodyne method in all-fiber feedback format. In this technique the feedback signals are coupled and transferred by fiber to simplify the system, while all factors of the signals such as the wavefront distribution, polarization state, power ratio of the sub-beams and the reference beam need to be considered and strictly controlled. Compared with the previous system, this technique brings another important advantage: Only the coupling side should meet stringent tolerance toward collimation. Phase detection for laser interferometry, phase control of sub-lasers is theoretically analysis and simulated to reveal the system control bandwidth, phase precision. A high speed phase detection circuit and a phase control circuit are developed. Proof of concept of this technique is experimentally demonstrated at 1.06μm. The experiment setup is shown. Stable results are obtained. The peak power rises up while the theoretical result is 2. Experiments reveal the validity of the technique in nanosecond pulse laser coherent combining.

Citation Download Citation

Yizhuo Zhang, Yan Jin, Zhuo Li, Li Cui, and Wenhua Hu "Coherent laser combining in all-fiber feedback format", Proc. SPIE 10798, High-Power Lasers: Technology and Systems, Platforms, and Effects II, 107980H (9 October 2018); https://doi.org/10.1117/12.2324445

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