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As liquid argon (LAr) detectors are made at progressively larger sizes,accurate models of LAr optical properties become increasingly important forsimulating light transport, understanding signals, and developing analyses. Therefractive index, group velocity, and Rayleigh scattering length areparticularly important for vacuum ultraviolet (VUV) and visible photons indetectors with diameters much greater than one meter. While opticalmeasurements in the VUV are sparse, recent measurements of the group velocityof 128 nm photons in LAr provide valuable constraints on these parameters.These calculations are further complicated by the dependence of opticalparameters on thermodynamic properties that might fluctuate or vary throughoutthe argon volume. This manuscript presents the model used by DEAP-3600, a darkmatter direct detection experiment at SNOLAB using a 3.3 tonne LArscintillation counter. Existing data and thermodynamic models are synthesizedto estimate the wavelength-dependent refractive index, group velocity, andRayleigh scattering length within the detector, and parameters' uncertaintiesare estimated. This model, along with in situ measurements of LAr scintillationproperties, is benchmarked against data collected in DEAP-3600, providing amethod for modeling optical properties in large LAr detectors and forpropagating their uncertainties through downstream simulations. Updates arealso presented of the Noble Element Simulation Technique (NEST) software,widely used to model scintillation and ionization signals in argon- andxenon-based detectors.

The DEAP-3600 liquid argon optical model and NEST updates