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The tunability of the two photon absorption coefficient (TPAC) is studied in the HgCdTe p-n junction with the external bias voltage. The TPAC in the p-n junction region will strongly manipulated by the build-in field induced Franz- Keldysh (F-K) effect on the energy band structure. The obvious two photon absorption process is clearly observed as the nonlinear enhancement of photo-voltage on the incident...
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