The narrow linewindth and fast frequency modulation capability make it an ideal laser source used for commercial LIDAR for wind measurement. It also can be used to monitoring the green house gases. It can be a very important part for NOAA to build the CO2 gas monitor network. This type of all-fiber laser can be used for in situ measuring the 13C/12C and 18O/16O isotope ratios in atmospheric CO2 by laser absorption spectrometry. In ecosystem research, isotope ratios of molecules such as CO2 are of interest as they may improve our understanding of the sources and sinks of this important greenhouse gas. Long-term, real time, continuous in situ measurement at ambient concentrations would provide valuable information for atmospheric and environmental research. Laser absorption spectroscopy is one of the most promising tools due to its high sensitivity, species selectivity and spectral resolution. Based on the molecule's spectral fingerprint, laser absorption spectroscopy measurement can be performed on a gaseous sample, without need for pre-sampling and pre-treatment.