Structural Design Of Optical Imaging Objective Lens For Ion Traps

Quantum computing is based on quantum mechanics,using quantum bits or "qubits" for parallel processing and exhibits data processing capabilities far beyond traditional computers.In quantum computing,controllable quantum systems are used to generate qubits,and any quantum computation can be implemented by combining a series of quantum logic gates and performing gate operations.Currently,quantum systems that can be used for quantum computing include superconducting qubits,ion qubits,semiconductor quantum dots,and nuclear magnetic resonance.Among them,the ion trap system applied to quantum computing has the advantages of long coherence time,high controllability,scalability and legibility,and has become a widely used quantum system.In the ion trap experiments,laser precision control technology is used to efficiently and accurately manipulate ions in the trap.During the operation process,the microscope objective lens used for optical imaging and fluorescence collection plays a crucial role in realizing the manipulation of ions in the ion trap.In addition,a spatial light modulator can be combined with the microscope objective lens to generate a microtrap array for single-atom capture.Based on the goal of manipulating trapped ions in an ion trap system,I designed a microscope objective lens with a long working distance and a higher numerical aperture,eliminating imaging errors caused by glass window with different thicknesses.And I also used a spatial light modulator to generate an optical array to trap the atoms.The specific design of microscope objectives needs to consider the influence of air chamber glass window thickness on beam focusing and imaging.In this thesis,the design of long working distance microscopic objective lenses is mainly as follows: firstly,the factors affecting the performance of the lens system and the method of evaluating the imaging quality are introduced;then,the specific design process of the objective lens is described,where I select an appropriate initial structure of the lens according to the design requirements and optimize the design;subsequently,the assembly and imaging quality evaluation of the long working distance microscope objective lens system are performed;finally,the microscope objective lens system is used for the focusing and imaging the optical array of spatial light modulator.