Improving the intensity and efficiency of compressed echo in rare-earth-ion-doped crystal
Ma Xiu-Rong1, 2, Liang Yu-Qing1, †, , Wang Song1, Zhang Shuang-Gen1, 2, Shan Yun-Long1
       

Basic mechanism of 3PE. The first pulse #1 interacts with the medium from t1 to . The next two pulses #2 and #3 are applied from t2 to and from t3 to , respectively. The echo is expected at time .