Variable aspect ratio beam expanding lens and laser communication terminal comprising same

The invention discloses a variable aspect ratio beam expanding lens and a laser communication terminal comprising the same, and belongs to the technical field of optical equipment.The beam expanding lens is composed of four cylindrical lenses, namely a first concave cylindrical lens and a second concave cylindrical lens form a first group of cylindrical lenses of the beam expanding lens, and a second group of cylindrical lenses of the beam expanding lens form a second group of cylindrical lenses of the beam expanding lens; the convex cylindrical lens I and the convex cylindrical lens II form a second group of cylindrical lenses of the beam expanding lens; each cylindrical lens rotates around the optical axis of the cylindrical lens; when each cylindrical lens rotates around the optical axis of the cylindrical lens, the two cylindrical lenses of the first group of cylindrical lenses are equal in rotation angle and opposite in direction; the two cylindrical lenses of the second group of cylindrical lenses are e