Laser scanning unit, module, laser emitting device and laser radar

The invention discloses a laser scanning unit and module, a laser emitting device and a laser radar, and relates to the technical field of radars. The first lithium niobate layer is laid on the outer side of the first coating layer of the laser scanning unit, so that certain mode distribution also exists in the first lithium niobate layer when light is transmitted in the phase shift waveguide. The first modulation electrode can adjust the refractive index of the first lithium niobate layer by applying an electric field to the first lithium niobate layer. Due to the special property of lithium niobate, the lithium niobate does not need to be doped and has a high photoelectric effect, so that the refractive index of the lithium niobate is controlled through the first modulation electrode, the phase of light is further controlled, and a better control effect is achieved. According to the laser scanning unit, the problem of high optical power loss caused by doping the waveguide in the prior art is solved, and the