氙灯抽运Er∶YAP晶体的中红外激光性能
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摘要
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 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.
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.
引文
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[16] Zhang H L,Sun D L,Luo J Q,et al.Growth,thermal,and spectroscopic properties of a Cr,Yb,Ho,Eu∶YAP laser crystal[J].Optical Materials,2014,36(8):1361-1365.
[17] Quan C,Sun D L,Luo J Q,et al.2.7 μm dual-wavelength laser performance of LD end-pumped Er∶YAP crystal[J].Optics Express,2018,26(22):28421-28428.
[2] Skorczakowski M,Swiderski J,Pichola W,et al.Mid-infrared Q-switched Er∶YAG laser for medical applications[J].Laser Physics Letters,2010,7(7):498-504.
[3] Wang L,Wang J T,Yang J W,et al.2.79 μm high peak power LGS electro-optically Q-switched Cr,Er∶YSGG laser[J].Optics Letters,2013,38(12):2150-2152.
[4] Sun D L,Luo J Q,Xiao J Z,et al.Luminescence and thermal properties of Er∶GSGG and Yb,Er∶GSGG laser crystals[J].Chinese Physics Letters,2012,29(5):054209.
[5] Allik T H,Chandra S,Rines D M,et al.Tunable 7-12-μm optical parametric oscillator using a Cr,Er∶YSGG laser to pump CdSe and ZnGeP2 crystals[J].Optics Letters,1997,22(9):597-599.
[6] Vodopyanov K L,Ganikhanov F,Maffetone J P,et al.ZnGeP2 optical parametric oscillator with 3.8-12.4-μm tunability[J].Optics Letters,2000,25(11):841-844.
[7] Zhang H L,Sun D L,Luo J Q,et al.Growth,structure,and spectroscopic properties of a Cr3+,Tm3+,Ho3+,and Pr3+ co-doped LuYAG single crystal for 2.9 μm laser[J].CrystEngComm,2016,18(31):5826-5831.
[8] Wang Y Z,Duan X M,Ke L,et al.Room temperature efficient continuous wave laser diode-end-pumped Tm∶YAP laser[J].Chinese Journal of Lasers,2009,36(7):1710-1713.王月珠,段小明,柯亮,等.室温下高效率连续波激光二极管端面抽运Tm∶YAP激光器[J].中国激光,2009,36(7):1710-1713.
[9] Massey G A.Criterion for selection of CW laser host materials to increase available power in the fundamental mode[J].Applied Physics Letters,1970,17(5):213-215.
[10] Fang Z Q,Sun D L,Luo J Q,et al.Thermal analysis and laser performance of a GYSGG/Cr,Er,Pr∶GYSGG composite laser crystal operated at 2.79 μm[J].Optics Express,2017,25(18):21349-21357.
[11] Zhang H L,Sun D L,Luo J Q,et al.Growth and spectroscopic investigations of Yb,Ho∶YAP and Yb,Ho,Pr∶YAP laser crystals[J].Journal of Luminescence,2015,158:215-219.
[12] Stalder M,Lüfthy W,Weber H P.Five new 3-μm laser lines in YAlO3∶Er[J].Optics Letters,1987,12(8):602-604.
[13] Zeng R R,Shen H Y,Huang C H,et al.A 2.7 μm Er∶YAP laser[J].Chinese Journal of Lasers,1990,17(S1):60-62.曾瑞荣,沈鸿元,黄呈辉,等.2.7 μm的Er∶YAP激光器[J].中国激光,1990,17(S1):60-62.
[14] You Z Y,Wang Y,Li J F,et al.Study on the properties of infrared laser in YAP crystals[C].Proceedings of National laser conference,2012.游振宇,王燕,李坚富,等.Er∶YAP晶体中波红外激光性能的研究[C].全国激光学术会议,2012.
[15] Chen J K,Sun D L,Luo J Q,et al.Spectroscopic properties and diode end-pumped 2.79 μm laser performance of Er,Pr∶GYSGG crystal[J].Optics Express,2013,21(20):23425-23432.
[16] Zhang H L,Sun D L,Luo J Q,et al.Growth,thermal,and spectroscopic properties of a Cr,Yb,Ho,Eu∶YAP laser crystal[J].Optical Materials,2014,36(8):1361-1365.
[17] Quan C,Sun D L,Luo J Q,et al.2.7 μm dual-wavelength laser performance of LD end-pumped Er∶YAP crystal[J].Optics Express,2018,26(22):28421-28428.