DepositionLaser: Check for FIle Existence

        refractive_index_ = config_.get<double>("refractive_index");

        LOG(DEBUG) << "Setting user-defined optical properties for sensor material";

    } else {

        // Load data

        std::string laser_data_path = ALLPIX_LASER_DATA_DIRECTORY;

        std::ifstream f(std::filesystem::path(laser_data_path) / "silicon_photoabsorption.data");

        // wavelength: {absorption_length, refractive_index}

        std::map<double, std::pair<double, double>> optics_lut;

        double wl = 0;

        double abs_length = 0;

        double refr_ind = 0;

        // Load data

        std::string laser_data_path = ALLPIX_LASER_DATA_DIRECTORY;

        auto file_path = std::filesystem::path(laser_data_path) / "silicon_photoabsorption.data";

        std::ifstream f(file_path);

        LOG(DEBUG) << "Loading optical properties for sensor material from LUT: " << file_path.string();

        if(!f || !std::filesystem::is_regular_file(file_path)) {

            throw ModuleError("Could not open optical properties reference file at \"" + file_path.string() + "\"");

        }

        while(f >> wl >> abs_length >> refr_ind) {

            optics_lut[Units::get(wl, "nm")] = {abs_length, refr_ind};

        }

        LOG(DEBUG) << "Loading optical properties for sensor material from LUT: " << laser_data_path;

        // Find or interpolate absorption depth for given wavelength

        if(optics_lut.count(wavelength_) != 0) {