采用氙灯抽运研究了原子数分数为10%的Er ³⁺掺杂的YAP晶体在2.7~3 μm波段的激光性能,使用3种不同透射率的输出镜,实现了最大输出能量为1173 mJ@1 Hz、1284 mJ@5 Hz、495 mJ@10 Hz、104 mJ@20 Hz的激光输出,对应的斜率效率分别为0.80%、0.99%、0.84%和0.44%。当重复频率为5 Hz,透射率为15%时,该晶体具有最大的输出能量和激光效率,相应的平均输出功率达到了6.42 W,约是目前已报道最好结果的4倍。测量了不同输入功率下Er∶YAP激光的光束质量,随着输入功率的增加,其光束质量逐渐下降。在输出激光中观察到了波长分别为2710,2728,2795,2918 nm的4条激光谱线。因此,Er∶YAP晶体可以实现优良的多波长中红外激光输出。

We demonstrate the laser performances of Er-doped YAP crystals with the atom fraction of Er 3+ of 10% pumped by an xenon lamp in the region of 2.7-3 μm. The output mirrors with three different transmissivities are adopted, and the maximum single pulse energies of 1173 mJ @1 Hz, 1284 mJ @5 Hz, 495 mJ @10 Hz, and 104 mJ @20 Hz with the corresponding slope efficiencies of 0.80%, 0.99%, 0.84% and 0.44% are achieved, respectively. Under the conditions of a repetition rate of 5 Hz and output mirror transmission of 15%, the highest laser output energy and laser efficiency can be obtained in the Er∶YAP crystals and the corresponding average output power is 6.42 W, which is about four times the existing best result reported by literatures. In addition, the laser beam quality of the Er∶YAP solid-state laser with different input powers is measured, which decreases with the increase of input power. Moreover, the four laser spectral lines at 2710, 2728, 2795, and 2918 nm are observed. Therefore, the excellent multi-wavelength mid-infrared laser output can be realized with Er∶YAP crystals.