A frequency-stabilized laser system based on a hollow-core photonic crystal fiber (HC-PCF) CO 2 gas cell for the space-borne CO 2 light detection and ranging (LIDAR) is proposed. This system will help realize precise measurement of the global atmospheric CO 2 concentrations. The relation between the frequency stability and the temperature of the HC-PCF cell was studied in detail. It is proved that accurate control of the temperature of the HC-PCF cell is very important to realize high stability of the proposed system. The laser is locked to CO 2 gas R18 absorption line at 1572.0179 nm, and its peak-to-peak frequency stability is approximately 485 kHz, satisfying the requirements for the integrated path differential absorption system for CO 2 measurement with an accuracy of <1 ppm over 5 h.
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