Yb-doped yttrium aluminum perovskite for radiation balanced laser application

Radiation balanced laser (RBL) can be realized by managing the cooling process via the anti-Stokes photoluminescence (PL), the small-signal gain, and the heating processes including the Stokes shifts and the multi-phonon relaxation. Yttrium aluminum perovskite (YAP) shows lower phonon energy than yttrium aluminum garnet (YAG) which the radiation balanced laser was demonstrated. According to the single-frequency phonon model, the low maximum phonon energy of YAP makes the multi-phonon relaxation probability of Yb-doped YAP [(Yb:Y)AP] smaller than Yb-doped YAG [(Yb:Y)AG]. The low multi-phonon relaxation probability of YAP suggests that (Yb:Y)AP is suitable material for RBL. In this work, we evaluated the PL characteristics and estimated the ideal laser cooling efficiency and the small-signal gain of the (Yb:Y)AP (Yb0.1Y0.9AlO3) ceramics fabricated by a solid-state reaction method. We used McCumber’s relationship and referred to the literatures to derive the absorption and the small-signal gain spectra. The fluorescence re-absorption is observed in the PL spectra of (Yb:Y)AP ceramics with a thickness of ~2 mm, whereas the re-absorption is not observed in (Yb:Y)AG(Yb 0.3Y2.7Al5O12). This result indicates the strong absorbance of (Yb:Y)AP. The obtained ideal laser cooling efficiencies of (Yb:Y)AP and (Yb:Y)AG at 300 K were 1.4 and 1.8%, respectively. On the other hand, the maximum small-signal gain of 0.27 cm−1 in (Yb:Y)AP is 3.5 times larger than that of 0.078 cm−1 in (Yb:Y)AG. The large smallsignal gain of (Yb:Y)AP arises from its strong absorbance and intrinsic energy structure.

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