• Corpus ID: 52238841

High power orbital-angular-momentum beam generation system based on coherent beam array combination technique

  title={High power orbital-angular-momentum beam generation system based on coherent beam array combination technique},
  author={Dong Zhi and Yanxing Ma and Pu Zhou and Rumao Tao and Xiaolin Wang and Lei Si and Zejin Liu},
  journal={arXiv: Optics},
High power orbital-angular-momentum (OAM) beam has dominant advantages in capacity increasing and data receiving for free-space optical communication systems at long distance. Utilizing coherent combination of beam array technique and helical phase approximation by piston-phase-array, we have proposed a generation system of high power novel beam carrying OAM, which could overcome power limitation of common vortex phase modulator and single beam. We have experimentally implemented a high power… 

Figures from this paper



Large deflection angle, high-power adaptive fiber optics collimator with preserved near-diffraction-limited beam quality.

A monolithic adaptive fiber optics collimator, with a large deflection angle and preserved near-diffraction-limited beam quality, that has been tested at a maximal output power at the 300 W level and a new measurement method of beam quality (M2 factor) is developed.

Realization of large energy proportion in the central lobe by coherent beam combination based on conformal projection system

Experimental results show a large energy proportion in the central lobe is achieved and the residual phase error is lower than λ/27 and the average normalized metric value is improved.

Novel adaptive fiber-optics collimator for coherent beam combination.

A novel design of adaptive fiber-optics collimator (AFOC), which utilizes two levers to enlarge the movable range of the fiber end cap, is experimentally validated and presents a promising structure for tilt aberration control in high power CBC system.

Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique.

Coherent beam combination of a 1.08 kW fiber amplifier array has been demonstrated for the first time and the fringe contrast of the far-field intensity pattern is improved to more than 85%, and the residual phase error is less than λ/15.

1.89 kW all-fiberized and polarization-maintained amplifiers with narrow linewidth and near-diffraction-limited beam quality.

This is the first demonstration of all-fiberized amplifiers with narrow linewidth, near linear polarization, and near-diffraction-limited beam quality at 2 kW power-level and both the polarization extinction ratio and beam quality are maintained well during the power scaling process.

Coherent beam combination with single frequency dithering technique.

Experimental results reveal that the single-dithering technique has great potential in scaling to a large number of beamlets with a simple phase control system and low cost.

Monolithic fiber end cap collimator for high-power free-space fiber-fiber coupling.

Free-space fiber-fiber coupling between two 20/400 μm fibers is achieved based on these collimators, with measured coupling loss lower than 0.3 dB.

High-power fiber lasers based on tandem pumping

Power scaling of fiber lasers is challenged by several factors, such as the brightness of the pump source, the nonlinear effect, modal instability, and so on. Pumping active fibers with

Communication with spatially modulated light through turbulent air across Vienna

Transverse spatial modes of light offer a large state-space with interesting physical properties. For exploiting these special modes in future long-distance experiments, the modes will have to be

Twisted light communication through turbulent air across Vienna

This work experimentally transmits classical information encoded in the intensity patterns of 16 OAM mode superpositions through 3 km of strong turbulence over the city of Vienna and shows that in this method the relative phase between two modes is transmitted in a stable way.