Er 3+ ‐doped CaF 2 polycrystalline ceramic with perfect transparency for mid‐infrared laser

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Abstract
Er 3+ ‐doped CaF 2 transparent ceramics are promising mid‐infrared gain materials because of their utra‐low phonon energy as well as excellent physical, chemical, and optical properties. However, existing hot‐pressed and hot‐formed CaF 2 ceramics are very difficult to be used in practical applications due to residual pores and weak polycrystallization, respectively. Here, we developed the high quality Er 3+ ‐doped CaF 2 transparent polycrystalline ceramic by single crystal ceramization. The sample exhibits obvious polycrystalline structure, good mechanical properties, perfectly transmittance, and excellent mid‐infrared performance, which provides significant and wide‐ranging opportunities for advanced mid‐infrared gain materials.
Funding Information
  • Natural Science Foundation of Shanghai Municipality (19YF1453300)

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