YAlO3(YAP)是优良的激光基质晶体，掺Ho3+的YAP晶体可以实现2.8-3微米的偏振调谐激光输出，在医疗、科研及军事等领域有着重要的应用前景。然而单掺Ho3+的晶体尚不能直接用目前LD泵浦源或闪光灯泵浦。我们初步的光谱实验表明，采用Yb3+敏化的Yb,Ho:YAP，适合940nm或970nm LD泵浦;采用Cr3+,Yb3+共掺敏化的Cr,Yb,Ho:YAP，适合闪光灯泵浦，两种晶体最后都要通过Ho3+离子5I6和5I7两个能级之间的跃迁，实现2.8-3μm调谐的偏振激光输出。初步的实验表明,通过能级耦合,可改善Ho3+激光下能级5I7寿命过长的问题。本项目将采用提拉法生长高光学质量晶体，通过能级耦合降低激光下能级寿命，采用热键合复合晶体减小热透镜效应，提高激光性能，通过优化敏化、激活及能级耦合离子浓度，获得高性能的Ho:YAP激光晶体,为2.9微米附近波长的激光应用奠定基础。

YAlO3 (YAP) is an excellent matrix crystal, the 2.8-3 micrometer wavelength polarization laser can be realized in the Ho:YAP crystal,which has important applications in the medicine, scientific and military fields. However, the single doped Ho3+ laser crystal cannot be pumped by LD pumping source and flash lamp. Our early spectra experiments indicate tnat Yb,Ho:YAP with Ho3+ ions sensitized by Yb3+ ions, which is suitable to be pumped by the 940nm or 970nm LD; the Cr,Yb,Ho:YAP with Ho3+ sensitized by double-doped Cr3+, Yb3+ ions, which is suitable to be pumped by flash lamp. At last, 2.8-3 μm polarization laser can be generated between the energy levels transition of 5I6 and 5I7 of Ho3+ ions. The experiment also suggests that the long laser lower level(5I7) lifetime of Ho3+ can be decreased by energy level coupling.In this project, we will grow the crystals with high optic quality by Czochralski method, to decrease the lifetime of laser low level by energy level coupling, to reduce the thermal lens effect by high temperature thermal-bonding for the purpose of the improvement of laser performance. In further, to optimize the doping concentration of sensitization,activation and energy coupling ions,to obtain the Ho:YAP crystal with high porformance,so that establish a foundation for the application of 2.9 micrometer Ho3+ laser。