There are a number of non-NASA commercial applications for the proposed 1.26-micron single frequency fiber laser. Its narrow linewidth, stable laser output at oxygen absorption wavelength makes it a favorable source for lots of other practical applications, which needs to monitor the gas, especially oxygen NASA's investigation of large-scale environmental processes requires highly accurate measurements of atmospheric parameters from ground-based, airborne, and spaceborne platforms. Coherent Doppler Lidars and Differential Absorption Lidars (DIALs), working with 1.26-micron lasers, enable the measurement of oxygen in the atmosphere. The proposed compact all-fiber based single frequency 1.26-micron fiber laser offers a commercial solution to such applications. Its anti-vibration package and all-fiber cavity design allow a compact, reliable and efficient package for the LIDAR application in ground, airborne and space-borne platform. Most components in the fiber laser and the seed laser have been used for space applications, which means both the fiber laser and seed laser can be qualified for space application.