Photophoretic trap testing rig for volumetric displays

In this Note, we describe a test rig for optimizing the trapping parameters of optical trap displays. This rig allows targeted experimentation on software, hardware, and environmental variables. These variables affect the success and robustness of particle trapping. We demonstrate the operation of the rig in a handful of example experiments while achieving an average standard error of less than 1% and an accuracy of over 98% at a reduced size, user overhead, and cost, allowing for rapid development of optical trap display research.