Method for directly generating multiple vortex beams in a cavity
A vortex beam and multi-vortex technology, applied in the field of laser, can solve the problems of increasing the information carrying capacity of optical communication and the limited amount of information carried, and achieve the effect of high purity and stable transmission
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[0020] A method for directly generating multi-vortex beams in a cavity is characterized in that the method includes the following steps:
[0021] 1) Build as figure 1 The laser structure shown, the laser consists of a pump source 1, a first convex lens 2, a second convex lens 3, a concave mirror 4, a gain crystal 5 and an output coupling mirror 6 (plane end) with circular holes and concentric rings of different sizes on the surface. Mirror) composition. The pump source 1 is a laser diode with an emission wavelength of 808nm, which is collimated and focused into the gain crystal 5 through the first convex lens 2 and the second convex lens 3, and the gain crystal 5 is a neodymium-doped yttrium vanadate crystal (Nd: YV04), The front and back surfaces of the crystal are coated with antireflection coatings with wavelengths of 1064nm and 808nm. The resonant cavity is composed of a concave mirror 4 and an output coupling mirror 6. The radius of curvature of the concave m...
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