新型电光陶瓷调Q光纤激光器

A Novel Electrooptic Ceramics Q-Switched Fiber Laser

报道了基于OptoCeramic 电光陶瓷材料的新型调Q光纤激光器。采用976nm半导体激光器作为抽运源，电光陶瓷调制器作为Q开关，峰值吸收系数1200dB／m的高掺杂镱纤作为增益介质构成环形腔激光器。增益光纤的高掺杂浓度使得激光器的腔长得到缩短，输出光脉冲的宽度得到压缩。通过调节电光元件的电压，控制材料的折射率，调节谐振腔的损耗，实现Q开关作用。实验中通过改变腔长、抽运功率和重复频率，研究了脉冲的输出特性。获得最窄脉宽104ns，重复频率3～40kHz连续可调的调Q脉冲输出。

A novel Q-switched fiber laser made of OptoCeramic electrooptic ceramics is reported. The ring laser is composed with an electrooptic ceramics modulator as Q-switch, highly Yb-doped fiber （peak absorption coefficient at 976 nm is 1200 dB/m） as the gain medium, and pumped by semiconductor laser of 976 nm wavelength. The adoption of highly doped gain fiber shortened the cavity, and meanwhile the output pulse width was compressed. Q-switch is realized from cavity loss modulation, the material refractive index control, which are depondent on the voltage of OptoCeramic element. The influences on output pulses from cavity length, pumping power and repetition rate are investigated. The laser system generates short pulses about 104 ns, with the repetition rate continuously adjusted from 3 kHz to more than 40 kHz.