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

Relationship between the intensity of 3PE and the delay time of the input pulses. The coherence time T₂ of the crystal is usually 1–100 ms and the population lifetime T₁ of the crystal is usually ∼ 10 ms.