短腔Er/Yb光纤光栅激光器

Short Cavity Er/Yb Fiber Grating Laser

报道采用光敏Ｅｒ／Ｙｂ 光纤制作短腔Ｅｒ／Ｙｂ 光纤光栅激光器的实验结果。激光谐振腔由一对直接写在３０ ｍ ｍ 长的Ｅｒ／Ｙｂ 光纤上、长度分别为６ ｍ ｍ 及１０ ｍ ｍ 、反射率分别为９０％ 及９８．６％ 、３ ｄＢ带宽分别为０．２８ ｎｍ 及０．２６ ｎｍ 的光纤布拉格光栅组成， 激光器的泵浦阈值为８ｍ Ｗ， 斜效率约１４％ ， 输出光的信噪比为６１ ｄＢ， 偏振模抑制比为３０ ｄＢ。

A short cavity Er/Yb fiber grating laser is demonstrated. Its resonant cavity is composed by two Bragg gratings which were UV written directly on a 30 mm photosensitive Er/Yb fiber. The two gratings were ~6 mm and 10 mm long, with 90% and 98.6% in reflectivity, 0.28 nm and 0.26 nm in 3 dB bandwidth, respectively. Pumped by a 980 nm diode laser, the associated fiber grating laser exhibits 8 mW thershold, ~14% slope efficieny, 30 dB polarisation mode suppression ratio. About 6 mW output power and 61 dB signal to noise ratio were obtained upon the maximum 50 mW 980 pump power in the experiment.