全光纤对接损耗调Q激光器  

All-Fiber Q-Switched Laser by Modulating Coupling Loss

作　　者：彭博[1] 柳强[1] 巩马理[1] 闫平[1] 

机构地区：[1]清华大学精密仪器系光子与电子技术研究中心摩擦学国家重点实验室,北京100084

出　　处：《中国激光》2008年第3期343-346,共4页Chinese Journal of Lasers

摘　　要：激光器调Q技术是产生高峰值功率、窄脉冲的最有效方法之一。提出并初步验证了全光纤对接损耗调Q方法,分析了调Q原理以及影响因素,实现调Q脉冲的输出。激光腔内加入两段光纤,两段光纤间相互靠近的一端紧密对接,其中一段粘结在压电陶瓷(PZT)上。通过外部电压变化驱动压电陶瓷,使两光纤端面间出现轴向间隙、径向错位或旋转夹角,改变两段光纤之间的耦合连接损耗,进而调节激光腔的损耗,输出调Q脉冲。采用径向错位方式,可以有效改变光纤之间的耦合连接损耗,重复频率可达10 kHz。该方法实现简单,成本低廉,通过外部条件控制,可进一步提高输出脉冲的稳定性。Q-switched technique is one of the most efficient methods to produce high-peak-power and narrow- duration pulses. An all-fiber Q-switched laser based on the modulation of coupling loss is proposed and the Q- switching principles and relative parameters are analyzed. Two fibers are used in the laser cavity. The neighbor terminals of these fibers are placed end-to-end, one of which is mounted on a piezoelectric actuator （PZT）. When a changed voltage outputted from a driver is applied to the PZT, a corresponding displacement of the fiber is generated. The displacement can be a longitudinal separation, a lateral offset or an axial tilt, which can modulate the coupling loss between the two fibers and change the round-trip loss in the fiber laser cavity as a result. When the lateral-offset mode is applied, Q-switching pulses are obtained up to the repetition rate of 10 kHz by changing the coupling loss efficiently. This method is easy and low cost, and increase its stability by external control.

关 键 词：激光器 光纤激光器 Q开关 对接损耗调Q方法 

分 类 号：TN248.1[电子电信—物理电子学]