This proposed single frequency high energy and high peak power fiber laser can be used as innovative lidar component for measurements of the atmosphere and gas contents of the Earth, Mars, the Moon, and other planetary bodies. This laser can also be used for other wavelength generation. Because it is fiber based, this single frequency high energy and high peak power amplifier is compact, efficient, and extremely reliable. There are a number of potential non-NASA commercial applications for high energy and high peak power fiber lasers and amplifiers. This laser source can be used to build commercial lidar for ranging and gas monitoring applications, and as the light source for optical sensing and scientific research. This laser can be used to build single frequency green laser.