Common methods of distance adjustment for laboratory optical components include displacement stages, rails and sliders, and other rough methods. Purchase a high precision and long travel displacement platform is expensive. When the intervals between multiple components need to be adjusted synchronously, faceing the space restriction of the platform. If the interval between components is very short, it will cause unavailability. Focusing components can adjust the spatial position of optical elements along the optical axis of the system for users, it provides a series of fast, economical and accurate adjustments for other occasions where focusing applications are needed.