Kadel Rajesh, Washburn Brian R
Kansas State University, Department of Physics, Manhattan, USA.
Appl Opt. 2012 Sep 20;51(27):6465-70. doi: 10.1364/AO.51.006465.
We have demonstrated a self-starting, passively mode-locked Tm/Ho codoped fiber laser that lases at one of two center wavelengths. An amplified 1.56 μm distributed feedback laser pumps a ring laser cavity which contains 1 m of Tm/Ho codoped silica fiber. Mode locking is obtained via nonlinear polarization rotation using a c-band polarization sensitive isolator with two polarization controllers. The laser is able to pulse separately at either 1.97 or 2.04 μm by altering the intracavity polarization during the initiation of mode locking. The codoped fiber permits pulsing at one of two wavelengths, where the shorter is due to the Tm(3+) emission and the longer due to the Ho(3+) emission. The laser produces a stable pulse train at 28.4 MHz with 25 mW average power, and a pulse duration of 966 fs with 9 nm bandwidth.
我们展示了一种自启动、被动锁模的Tm/Ho共掺杂光纤激光器，它在两个中心波长之一处产生激光。一个放大的1.56μm分布反馈激光器泵浦一个环形激光腔，该腔包含1m的Tm/Ho共掺杂石英光纤。通过使用带有两个偏振控制器的c波段偏振敏感隔离器，利用非线性偏振旋转实现锁模。通过在锁模启动期间改变腔内偏振，该激光器能够在1.97μm或2.04μm处分别产生脉冲。这种共掺杂光纤允许在两个波长之一处产生脉冲，其中较短波长归因于Tm(3+)发射，较长波长归因于Ho(3+)发射。该激光器产生频率为28.4MHz、平均功率为25mW的稳定脉冲序列，脉冲持续时间为966fs，带宽为9nm。
