演示了高增益谐波发生器式自由电子激光器。我们采用激光种子源的自由电子激光，经纵向相干、放大和傅里叶变换限制在种子源激光的谐波输出。种子源二氧化碳激光在波长10.6靘产生饱和，在二次谐波波长5.3靘输出放大的自由电子激光。实验证明将这种技术和方法应用到光谱的真空紫外区的理论基础，推广这种方法的最终目的是提供产生非常强的高度相干硬X射线源。 Demonstrated high gain harmonic generator free electron lasers. We use free-electron lasers with laser seed sources that limit the harmonic output at the seed source laser by longitudinal coherence, amplification, and Fourier transformation. The seed-source CO2 laser saturates at a wavelength of 10.6 ° and outputs an amplified free-electron laser at a second-harmonic wavelength of 5.3 °. Experiments have proved that applying this technique and method to the theoretical basis of the vacuum ultraviolet region of the spectrum, the ultimate goal of popularizing this method is to provide a very strong highly coherent hard X-ray source.