Ho:YAP
Ho:YAP crystals have an orthorhombic structure, are negative biaxial crystals, and are optically anisotropic. Compared with Ho:YAG, Ho:YAP has similarly excellent thermodynamic properties, while its intrinsic birefringence can effectively reduce the detrimental effects of thermal depolarization and thermal lensing on beam quality, thereby improving laser output efficiency. In addition, the structural anisotropy of Ho:YAP makes its emission cross section anisotropic; Ho:YAP crystals of different orientations have different lasing functions, output wavelengths, and operating modes. Its excellent thermodynamic and laser-spectroscopic properties make Ho:YAP an important crystal for laser output in the 2µm band.
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