The change of the optical interband absorption of non‐conducting crystals in an external electric field is investigated. The degeneracy of the band structure is considered. The modification of the absorption by the electric field is shown to be the superposition of the Stark effect and of the Franz‐Keldysh effect. In particular, the transitions Γ → Γ and X5 → X5 in diamond type crystals are considered. The transition Γ → Γ shows a quadratic Stark effect and the transition X5 → X5 a linear one.
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Enderlein et al. (1969) studied this question.
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