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Radiant fluence from ray tracing in optical multipass systems
Applied Optics- received 01/28/2024; accepted 04/15/2024; posted 04/15/2024; Doc. ID 520267
- Abstract: Optical multipass cells are used in photochemical reactors and laser excitation of weak transitions. In theseapplications, estimation of the radiation dose in a volume of interest allows to assess the performance andoptimize the design of the cell. We adopt radiant fluence as the figure of merit and employ the radiativetransfer equation to derive analytical expressions for average radiant fluence in a given volume of interest.These expressions involve quantities that are either obtained with Monte Carlo ray tracing methods orapproximated on the grounds of geometry arguments. Furthermore, we compute the spatial distribution offluence by applying either of the two methods to individual volume elements in a rectangular voxel grid.Ray tracing is performed with Zemax OpticsStudio 18.9.