Can Lumerical simulate two photon absorption (TPA) and spatial hole burning?
Two-photon absorption: Nonlinear effects with respect to the field magnitude are generally taken into account in TWLM by specifying "gain compression factor". This is one of the standard ways in the literature for transmission line laser models (such as TWLM). The definition of this factor, named epsilon, can be found in eq. 11 here:
Spatial hole burning: This effect is taken into account self-consistently in TWLM. Some effects of spatial hole burning are discussed here:
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