高能激光已广泛应用于科研、工业和**领域。由于大气对激光传输过程会产生影响，测量研究高功率激光器远场光束质量一直是困扰研究者的一项难题。 提出了一种远场光束质量相对测量和绝对测量相结合的测试方法，并测量分析了高功率1.4 kW脉冲TEA CO2 激光器在500 m处的光强分布。实验结果 表明,高功率CO2 激光器光束经500 m传输后达到靶面位置的最大功率密度为1.65 W/cm2，光束的横向远场发散角达到0.96 mrad。实验结果为提高系统的优化设计提供了重要的参考依据。

High-energy lasers are widely used in the fields of science, industry and military. Because of the influence of atmosphere on the transmission of a laser, the investigation of far-field beam quality of a high-power laser is always a problem. To obtain the optical intensity distribution of a 1.4 kW pulsed TEA CO2 laser at the distance of 500 m, a relative measurement method combined with absolute measurement is proposed. The measurement data are discussed and analyzed. The experimental result shows that the maximum power density on the target is 1.65 W/cm2 and the divergence angle in the cross direction is up to 0.96 mrad. The result is valuable to the optimization design of laser systems.