SBIR Phase I: Watt Level, Narrow Linewidth, Single Frequency Fiber Laser at 1550 nm

这个小型企业创新研究第一阶段项目旨在展示一种紧凑型、瓦级、工作在1550 nm左右的单频光纤激光器。该激光器将利用专有的高度Yb：Er共掺光纤，允许光纤激光器腔的总长度小于5厘米-这是传统光纤方法不可能完成的任务。如此短的腔长特别适合于极其稳定和无模式跳跃的单频工作。高掺杂水平和大的光学模场直径将被用来减少光纤非线性的影响，并允许短而紧凑的线性腔。在人眼安全的波长下，高功率和接近理想的光谱(空间输出)，其中掺Er光纤放大器和其他光纤组件将很容易获得。这将使这种激光器在许多商业应用中非常有吸引力，包括相干激光雷达、分布式温度和压力传感以及频率转换。该项目最终将产生一种可销售的产品，将用于各种民用和军用应用。

This Small Business Innovation Research Phase I project is aimed at the demonstration of acompact, Watt-level, single frequency fiber laser operating around 1550 nm. The laser will take advantage of proprietary, highly Yb: Er co-doped fiber allowing the total length of the fiber-laser cavity to less than 5 cm - a task impossible with conventional fiber approaches. Such a short cavity length is uniquely suited for extremely stable and mode hop free single frequency operation. High doping levels and a large optical mode field diameter will be used in order to reduce the influence of fiber non-linearities and allow for a short and compact linear cavity.The high power and near ideal spectral (spatial output) at an eye-safe wavelength, where Er-doped fiber amplifiers and other fiber-optic components would be readily available. This would make such a laser very attractive for many commercial applications including coherent LADAR, distributed temperature and pressure sensing and frequency conversion. The project should ultimately result in a marketable product that will be used in a variety of civil and military applications.