钒酸盐晶体拉曼及其混频可见光波段激光研究进展 
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Research Progress of Raman and Frequency Mixing for Visible Lasers Based on Vanadate Crystals
温州大学激光与光电子技术研究所, 浙江 温州 325035
图 & 表
图 1. YVO4晶体的拉曼频移特性图[16]
Fig. 1. Raman shift characteristic diagram of YVO4 crystal[16]
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图 2. 为实验设计出的两种键合晶体
Fig. 2. Two kinds of bonded crystals designed for experiments
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图 3. 基于自拉曼和选择性混频机制的多波长可选激光运行机制
Fig. 3. Multi-wavelength switchable laser operation mechanism based on self-Raman and selective frequency mixing
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表 1常见拉曼晶体的拉曼性能参数[9]
Table1. Raman performance parameters of common Raman crystals[9]
| Crystal | Ramanshift /cm-1 | Raman linewidth /cm-1 | Raman gain at1064 nm/(cm·GW-1) | Damage threshold /(GW·cm-2) |
|---|
| PbMO4 | 870 | 8 | ~8 | ~0.4 | | BaWO4 | 925 | 1.6 | 8.5 | - | | SrWO4 | 922 | 2.7 | 5 | ~5 | | GdVO4 | 885 | 3.0 | >4.5 | ~1 | | YVO4 | 890 | 2.6 | >4.5 | ~1 | | Ba(NO3)2 | 1047 | 0.4 | 11 | ~0.4 | | KGW | 768 | 6.4 | 4.4 | ~10 | | 901 | 5.4 | 3.5 | |
|
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表 2各晶体性能及能级跃迁参数
Table2. Crystal performance and energy level transition parameters
| Crystal | Tetragonal Nd∶YVO4 | Tetragonal Nd∶GdVO4 | Tetragonal Nd∶LuVO4 |
|---|
| Wavelength of4-I11/2 transition /nm | 1064 | 1063 | 1066 | | Stimulated cross section of4-I11/2 transition /(10-19 cm2) | 12 | 7.6 | 14.6 | | Fluorescence lifetime /μs | 90 | 90 | 129 | | Raman gain@1064 nm /(cm·GW-1) | >4.5 | >4.5 | >3.2 | | Raman shift /cm-1 | 890 | 885 | 900 | | Raman line width /cm-1 | 2.6 | 3.0 | 5.0 | | Thermalconductivity /(W·m-1·K-1) | 5.2 | 11.7 | 9.7 |
|
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表 31176 nm倍频相位匹配参数
Table3. Phase-matching parameters for second harmonic generation at 1176 nm
| Crystal | BBO | LBO | KTP |
|---|
| PM type | CPMI | NCPMI | CPMII | | Temperature /K | 300 | 315 | 300 | | deff /(pm·V-1) | 2 | 0.839 | 3.5 | | PM angle | θ=21.5° | θ=90°,ϕ=0° | θ=69°,ϕ=0° | | Walk-off angle /mrad | 52.87 | 0 | 34.32 |
|
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表 4各波长组合对应不同混频机制的非线性光学晶体相位匹配参数
Table4. Phase-matching parameters of nonlinear optical crystals with different frequency mixing mechanisms corresponding to different wavelength combinations
| Wavelengthconversion | 1064 nmSHG | 1064 nm &1176 nm SFG | 1176 nmSHG | 1176 nm &1313 nm SFG | 1313 nmSHG |
|---|
| Outputwavelength /nm | 532 | 559 | 588 | 620 | 657 | | LBO PM angle | θ=90°,ϕ=11.3° | θ=90°,ϕ=7.9° | θ=90°,ϕ=3.7° | θ=86.7°,ϕ=0° | θ=85.8°,ϕ=0° | | LBO PMtemperature /℃ | 149 | 89 | 41 | 10 | -1 | | BBO PM angle /(°) | 22.9 | 22.1 | 21.5 | 20.9 | 20.4 |
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程梦瑶, 段延敏, 孙瑛璐, 张立, 朱海永. 钒酸盐晶体拉曼及其混频可见光波段激光研究进展[J]. 激光与光电子学进展, 2020, 57(7): 071611. Mengyao Cheng, Yanmin Duan, Yinglu Sun, Li Zhang, Haiyong Zhu. Research Progress of Raman and Frequency Mixing for Visible Lasers Based on Vanadate Crystals[J]. Laser & Optoelectronics Progress, 2020, 57(7): 071611.
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