Chen Yujin, Lin Yanfu, Huang Jianhua, Gong Xinghong, Luo Zundu, Huang Yidong
Opt Express. 2018 Jan 8;26(1):419-427. doi: 10.1364/OE.26.000419.
A composite crystal consisting of a 1.5-mm-thick Er:Yb:YAl(BO) crystal between two 1.2-mm-thick sapphire crystals was fabricated by the thermal diffusion bonding technique. Compared with a lone Er:Yb:YAl(BO) crystal measured under the identical experimental conditions, higher laser performances were demonstrated in the sapphire/Er:Yb:YAl(BO)/sapphire composite crystal due to the reduction of the thermal effects. End-pumped by a 976 nm laser diode in a hemispherical cavity, a 1.55 μm continuous-wave laser with a maximum output power of 1.75 W and a slope efficiency of 36% was obtained in the composite crystal when the incident pump power was 6.54 W. Passively Q-switched by a Co:MgAlO crystal, a 1.52 μm pulse laser with energy of 10 μJ and repetition frequency of 105 kHz was also realized in the composite crystal. Pulse width was 315 ns. The results show that the sapphire/Er:Yb:YAl(BO)/sapphire composite crystal is an excellent active element for 1.55 μm laser.
通过热扩散键合技术制备了一种复合晶体，该复合晶体由两块1.2毫米厚的蓝宝石晶体之间夹着一块1.5毫米厚的铒镱铝硼（Er:Yb:YAl(BO)）晶体组成。与在相同实验条件下测量的单块铒镱铝硼（Er:Yb:YAl(BO)）晶体相比，由于热效应的降低，蓝宝石/铒镱铝硼（Er:Yb:YAl(BO)）/蓝宝石复合晶体展现出了更高的激光性能。在半球形腔中由976纳米激光二极管进行端面泵浦时，当入射泵浦功率为6.54瓦时，复合晶体中获得了波长为1.55微米的连续波激光，其最大输出功率为1.75瓦，斜率效率为36%。通过钴镁铝氧化物（Co:MgAlO）晶体进行被动调Q，复合晶体中还实现了波长为1.52微米、能量为10微焦、重复频率为105千赫兹的脉冲激光。脉冲宽度为315纳秒。结果表明，蓝宝石/铒镱铝硼（Er:Yb:YAl(BO)）/蓝宝石复合晶体是一种用于1.55微米激光的优异有源元件。
