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Growth, thermal, and spectroscopic properties of a Cr,Yb,Ho,Eu:YAP laser Crystal
Authors: Huili Zhang, Dunlu Sun, Jianqiao Luo, Jiakang Chen, Huajun Yang, Jingzhong Xiao, Qingli Zhang, Shaotang Yin
Ref.: Optical Materials 36, 1361-1365 (2014)
Abstract: A new Cr,Yb,Ho,Eu:YAlO3(YAP) laser crystal was successfully grown by the Czochralski method. Thermal properties were investigated along the a, b, and c crystalline axes. Results indicate that the Cr,Yb,Ho,Eu:YAP crystal has large anisotropic thermal expansion and that the suitable crystal growth direction is the b axis. The Debye temperatures were fitted, and the lattice vibration frequencies were calculated. Spectroscopic measurements show that Cr3+ and Yb3+ can be used as sensitizers of Ho3+ ions, and Eu3+ ions can play a role of the deactivator in decreasing the lifetime of laser lower level I-5(7) from 8.69 ms to 1.89 ms, which is beneficial in decreasing laser threshold and increasing laser conversion efficiency. All these findings suggest that the Cr,Yb,Ho,Eu:YAP crystal is a new potential candidate for realizing 2.8-3 mu m laser output pumped by a 970 nm laser diode or pulsed flash lamp. (C) 2014 Elsevier B.V. All rights reserved.
