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采用遮挡法引入相移制作了掺Yb相移光纤光栅(PS-FBG)。在制作光栅的过程中,将其作为激光器的谐振腔,通过监测激光器的输出功率来确定相移大小。当激光器的输出功率开始下降时,停止曝光,此时引入的相移为π/2。为了使光栅的特性尽快稳定下来需要对光栅进行退火,这将导致引入的相移小于π/2。为了弥补退火过程中引起的相移降低,需要对退火后的光栅进行二次曝光,以使光栅的相移恢复π/2。利用该方法制作了一只光纤光栅激光器。当抽运功率为100 mW时,获得了25 mW的输出功率,信噪比(SNR)为60 dB。在1 h内,输出功率波动小于1%。当光栅的温度在25~30℃之间变化时,激光器单纵模运转。
Yb phase-shift fiber grating (PS-FBG) doped with phase shift was fabricated by using occlusion method. In the process of fabricating the grating, it is used as the cavity of the laser to determine the magnitude of the phase shift by monitoring the output power of the laser. When the output power of the laser begins to drop, the exposure is stopped, and the phase shift introduced at this time is π / 2. In order to stabilize the characteristics of the grating as soon as possible to anneal the grating, which will lead to the introduction of the phase shift is less than π / 2. In order to compensate for the phase shift caused during the annealing process, the annealed grating needs to be double-exposed so as to restore the phase shift of the grating by π / 2. A fiber grating laser was fabricated by this method. At a pumping power of 100 mW, 25 mW of output power was achieved with a signal-to-noise ratio (SNR) of 60 dB. Within 1 h, the output power fluctuation is less than 1%. When the grating temperature changes between 25 ~ 30 ℃, the laser single vertical mode of operation.