Nonlinear multiplexing holography emerges as a powerful tool to produce structured lights at new wavelengths. In this work, we propose and experimentally demonstrate an angle-multiplexing nonlinear holography in an angular noncritical phase-matching configuration. In experiment, various types of structured light beams, such as vortex beam, Airy beam and Airy vortex beam, are simultaneously output at second-harmonic waves along different paths. Because of the large angular acceptance bandwidth of noncritical phase-matching, one can achieve high conversion efficiency of angle-multiplexing nonlinear holography. Our method has potentially applications in high-capacity holographic storage and security encryption.
We experimentally demonstrate the controllable laser output of cylindrical vector (CV) beams, which feature flexibility, high efficiency, and good beam quality. Particularly, the CV laser beams have negligible radial components, distinguishing themselves from the extra-cavity-generated CV beams. The output state is controlled by an intra-cavity vortex half-wave plate (VWP). By changing the topological charge (l) of VWP, we produce l = 1 and l = 2 CV beams for example. Through rotating the half-wave plate inside the cavity, the laser outputs arbitrary CV beams around the equator of the corresponding high-order Poincaré spheres. For l = 1 and l = 2 CV beams, the polarization purities are as high as 97.8% and 96.7%, the sloping efficiencies are 15.5% and 5.4%, and the beam quality factors are 2.10 and 3.31, respectively. Our result provides a reliable CV laser source for advanced applications in optical imaging and optical manipulation.
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