氙灯抽运Er∶YAP晶体的中红外激光性能

Mid-Infrared Laser Performances of Er∶YAP Crystals Pumped by Xenon Lamp

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2.7～3μm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 Er3+ 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.