Improving the intensity and efficiency of compressed echo in rare-earth-ion-doped crystal

Ma Xiu-Rong^{1, 2}, Liang Yu-Qing^{1, †,}, Wang Song¹, Zhang Shuang-Gen^{1, 2}, Shan Yun-Long¹

Diagram for generation of compressed echo. Each chirp laser is regarded as numerous discrete frequency rectangle pulses, where N is the amount of pulses and Δ ω is the frequency step.