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光镊利用强会聚激光对微粒产生的梯度力来捕获微粒,可以进行无损、远程操控,同时具有皮牛精度的测力特性,已经成为物理学、生命科学和胶体化学等研究领域中不可缺少的研究工具。光镊效应可以表现微小的光子动量和角动量,是物理学的重要教学工具。本文根据高斯光束传播和变换规律,设计具有稳定捕获性能的最小化光镊,并给出了典型参数。光镊系统由捕获激光、光束耦合系统、倒置生物显微镜和大数值孔径物镜组成,成像系统由物镜、摄影目镜和CCD相机组成。本光镊系统具有紧凑特性,同时通过保持物镜后瞳充满度来实现稳定捕获。在该最小光镊系统上,可以根据用户需求增加光镊阱位操控系统、刚度调节系统和其他辅助设备以满足不同操控要求,可以很好地满足科研和教学需求。
Optical tweezers capture the particles with the gradient force generated by the strong convergent laser on the particles, allowing non-destructive, remote manipulation and force-measuring characteristics of the accuracy of the bovine calculus, which have become indispensable in the fields of physics, life science and colloid chemistry research tool. Optical tweezers effect can show tiny photon momentum and angular momentum, physics is an important teaching tool. In this paper, based on the Gaussian beam propagation and transformation law, we design a minimum optical tweezers with stable acquisition performance and give typical parameters. The optical tweezers system consists of a capture laser, a beam coupling system, an inverted biological microscope and a large numerical aperture objective. The imaging system consists of an objective, a photographic eyepiece and a CCD camera. The optical tweezers system has a compact nature, and at the same time by keeping the objective pupil fullness to achieve a stable capture. The minimum optical tweezers system, according to user needs to increase optical tweezers well position control system, stiffness adjustment system and other auxiliary equipment to meet different control requirements, can well meet the research and teaching needs.