Optical system for precise control of hollow beam size

Abstract

The invention discloses an optical system for precisely regulating and controlling the size of a hollow light beam.The optical system comprises an optical platform, a laser is placed on the optical platform, and a collimation and beam expanding system, a diameter-adjustable circular seam, rotary ground glass, a thin lens and an axicon are sequentially placed along the light path of the laser.By means of the optical system, the size of the hollow light beam can be precisely regulated and controlled in the mode of changing the diameter of the circular seam, and a simple and effective new way is provided for acquiring the hollow light beam with the adjustable size.A powerful means is provided for flexibly controlling particles with different sizes.The optical system has the advantages that the number of involved optical elements is small, the structure is simple, constructing and debugging are easy, operation is easy, the size of the hollow light beam is controlled precisely, and therefore the optical system has wide market prospects in practical application.

Description

technical field [0001] The invention relates to the field of optics, in particular to an optical system for precisely regulating the size of a hollow beam. Background technique [0002] A hollow beam is an annular beam with zero intensity in the direction of propagation. When the beam is used for particle trapping, it has the advantages of non-contact, non-damage and low disturbance, so it has attracted widespread attention. In 2013, Eckerskorn et al. proposed the scheme of using a hollow beam as a laser catheter, and successfully achieved the capture and guidance of particles in experiments; in 2015, Porfirev et al. used a hollow beam to successfully realize the trapping of carbon nanoparticles in the air. In 2015, Turpin et al proposed cooling and imprisoning the halo with blue detuning 87 A new scheme for the Bose-Einstein condensate of Rb atoms, which has been verified in related experiments. Therefore, the generation and application of hollow beams have always been a...

AI Technical Summary

Problems solved by technology

At present, there are many ways to generate hollow beams, such as wave plate phase plate method, optical fiber method, spiral phase plate method, biaxial pyramid method, computer holography method, etc., but the size of hollow beams generated by these methods is mostly difficult to control and cannot be captured flexibly. Particles of different sizes than manipulated, limiting their practical applications

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