Tunable semiconductor laser optical tweezers system

Abstract

The invention discloses a tunable semiconductor laser optical tweezers system, including an edge-emitting semiconductor laser, and a plano-convex cylindrical lens, a gradient index lens, an axicon, afocusing lens arranged in sequence according to a laser optical path of a laser. The plano-convex cylindrical lens is placed on the position where circular distribution shows in a light outgoing propagation law process of the edge-emitting semiconductor laser. The distance between the focusing lens and the vertex of the axicon should be larger than the focal length of the focusing lens, and be smaller than a maximum non-diffraction distance that emergent light of the edge-emitting semiconductor laser passes through a light beam shaping system and generates Bessel beams through the axicon. Theoptical tweezers system can obtain bottle beams in different sizes as long as moving the distance between the gradient index lens (GRIN) and the plano-convex cylindrical lens, so as to capture and operate particles. The optical tweezers system is convenient for miniature integration, an optical damage problem of particles is not needed to be worried, and a new effective approach is provided for the semiconductor laser optical tweezers system.

Description

technical field [0001] The invention relates to the field of laser beam shaping, in particular to an adjustable semiconductor laser optical tweezers system. Background technique [0002] Optical tweezers are also called single-beam gradient optical traps. Simply put, it uses a three-dimensional potential well formed by a highly concentrated laser to capture and manipulate tiny particles. Optical tweezers is a three-dimensional gradient optical trap formed by the mechanical effect of momentum transfer between light and matter to manipulate particles. The local hollow beam (Bottle beam) is a beam with a local three-dimensional closed dark hollow area along the direction of light transmission. Due to the three-dimensional closed dark hollow region and extremely high intensity gradient, the local hollow beam can be used as a powerful tool such as laser catheter, optical tweezers and optical wrench. Local hollow beam optical tweezers have been successfully applied to the manip...

AI Technical Summary

Problems solved by technology

However, due to the influence of the asymmetric optical waveguide, the output beam of the semiconductor laser is asymmetrical in the direction perpendicular to the junction plane and parallel to the junction plane, the output beam is an astigmatic elliptical Gaussian beam, and the beam quality is not balanced

Therefore, beam shaping methods must be used in practical applications to solve the problems of poor beam quality and low power density

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