Device for forming quasi-double half-gauss hollow laser beam

Abstract

The invention discloses a quasi-double semi-gaussian hollow laser beam forming apparatus which realizes the conversion from a gaussian solid laser beam to a quasi-double semi-gaussian hollow laser beam to a certain extent, and belongs to the laser technical field. The prior hollow laser beam forming apparatus adopting the geometrical optics method has the defects that the light intensity of the formed hollow laser beam still has double-gaussian distribution, and the formed laser beam is not a practical hollow laser beam. The quasi-double semi-gaussian hollow laser beam forming apparatus is sequentially composed of a concave spherical reflecting mirror, a normal conical surface reflecting mirror and a positive lens, the three of which are coaxial in optics; the conical surface of the normal conical surface reflecting mirror is opposite to the concave spherical surface of the concave spherical reflecting mirror; an incident hole is formed in the center of the concave spherical reflecting mirror; and the object focal point of the positive lens is coincident to the reflected light convergence dot of the concave spherical reflecting mirror. The light intensity distribution of the hollow laser beam formed by the apparatus is near the quasi-double semi-gaussian distribution state, and the formed laser beam is the quasi-double semi-gaussian hollow laser beam applied to the fields of laser processing, atom cooling, bioengineering and the like.

Description

technical field [0001] The invention relates to a quasi-double-half-Gaussian hollow laser beam forming device, which realizes the conversion of a Gaussian solid laser beam to a double-half-Gaussian hollow laser beam to a certain extent, and belongs to the field of laser technology. Background technique [0002] The ideal hollow laser beam is characterized by a steep light intensity distribution on the inner wall, and the hollow area is completely dark, see figure 1 As shown, it is called a double half-Gaussian hollow laser beam. Hollow laser beams that are close to ideal, that is, practical hollow laser beams, can be used in laser processing, atomic cooling, bioengineering and other fields. So far, a variety of schemes have been proposed for the formation of hollow laser beams, such as transverse mode selection method, geometric optics method, optical holography method, computational holography method, mode conversion method, rotating prism method, etc. These schemes can re...

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Problems solved by technology

This technical effect is consistent with Yong Qian (Qian Yong) and Yuzhu Wang (Wang Yuzhu) in CHINESE OPTICS LETTERS / Vol.2, No.4 / April10, 2004 entitled Theoretical analysis of a collimated hollow-laser-beam generated by a single The double Gaussian distribution analyzed in the paper of axicon using diffractive integral is consistent, and its effect is only to improve the degree of opacity in the hollow area of ​​the hollow laser beam

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