第四章 Nd:YVO 4 之四能階雷射
4.2 波長 1064nm 及倍頻轉換 532 nm 綠光雷射之特性
mm2，長度 2 mm 的 YVO4配上摻雜釹離子濃度 0.2 at. %、長度 6 mm 的 Nd:YVO4 擴散鍵結(diffusion-bond)晶體所構成。倍頻晶體為長度 10 mm，截面 3×3 mm2的 Type-II KTP 晶體，切角為
90
0， 23.5
0。第一 面鍍上對波長 1064 nm 及波長 532 nm 抗反射鍍膜(AR, R<0.2%)，第二 面鍍膜則鍍上對波長 1064 nm 的高反射率鍍膜(HR, R>99.9%)以及對波 長 532 nm 的高穿透鍍膜(HT, T>97%)。共振腔長度 2.8 cm。激發光源為 OPTO POWER CORPORATION 15-W 808-nm 光纖耦合半導體雷射，可 連接輸出控制器調整連續或脈衝激發雷射的模式。而其輸出光纖芯蕊直Coupling Lens
Laser Diode
1：1 M
3 cm Nd:YVO 4
OC
Laser Diode LUMICS 20 W， Core diameter:200 μm Pumping Spot Size 200 μm
Nd:YVO4 0.4 at. % doped 3*3*6 mm3
S1，S2: AR @ 1064 nm，HT@808 nm M HR@1064 nm,532 nm ，HT@808 nm
0 5 10 15 20 25 0
2 4 6 8 10 12
Output Power (w)
Input Power (w)
圖 4.2.2：波長 1064 nm 雷射輸出功率圖
Laser Diode M
Nd:YVO
4+YVO
42.8cm
KTP 2：1
Laser Diode 1. LUMICS 20 W， Core diameter:200 μm 2. LUMICS 20 W， Core diameter:1000 μm Pumping Spot Size 100 μm
Nd:YVO4+YVO4 3*3*2 mm3 YVO4+3*3*6mm3 Nd:YVO4
0.2 at. % doped
M ROC1= -10 cm，ROC2= 5 cm S1：HT@808 nm
0 4 8 12 16 20 0.0
0.4 0.8 1.2 1.6 2.0
Output Power (w)
Input Power (w)
圖 4.2.4：倍頻綠光雷射輸出功率圖
0 2 4 6 8 440
460 480 500
Ture pulse width ( s)
Input power (W)
100 m 500m
圖 4.2.5：激發光束直徑大小對波長 532 nm 綠光雷射輸出之影響圖
500 μ m 100 μ m
500 μ m 100 μ m
圖 4.2.6：激發光束直徑大小 500 μm 與 100 μm 之綠光雷射脈衝 波形比較圖
第五章 雙波長雷射
為增益介質。Nd:YAG 晶體的第一面鍍上對波長 946 nm 與 473 nm 的高
nm 的雷射共振腔改為共用一面輸出耦合鏡。其架構如圖 5.2.2。除了輸 出耦合鏡外，其他組件皆與前述相同。在此架構下，共振腔腔長 1.5 cm。
Coupling Lens
Laser Diode LUMICS 20W Core diameter：200um Pumping Spot Size 300 μm S2: AR@946nm, 1064 nm
Coupling Lens
5.3 實驗結果與討論
33%。
2.5 3.0 3.5 4.0 4.5 5.0 0.0
1.5 3.0 4.5 6.0
O u tp u t p o w e r ( W)
Cavity length (cm)
Total 1064 nm 946 nm
圖 5.3.1：平面耦合輸出鏡 OC2 為對波長 1064 nm 反射率 R=10%之雷射 輸出功率圖
2 3 4 5 0.0
1.5 3.0 4.5 6.0
Output Power (w)
Cavity Length (cm)
Total 946 nm 1064nm
圖 5.3.2：平面耦合輸出鏡 OC2 為對波長 1064 nm 反射率 R=20%之雷射
3 4 5 6 7 0.0
1.5 3.0 4.5 6.0 7.5
Output Power (w)
Cavity Length (cm)
Total 946 nm 1064nm
圖 5.3.3：平面耦合輸出鏡 OC2 為對波長 1064 nm 反射率 R=30%之雷射 輸出功率圖
0 10 20 30 0
2 4 6
Reflection at 1064 nm (%)
Output Power (w)
Total 946nm 1064nm
圖 5.3.4：平面耦合輸出鏡 OC2 對波長 1064 nm 不同反射率的鍍膜 與雷射輸出功率關係圖
0 4 8 12 16 20 24 0
1 2 3 4 5
Outpower (w)
Input Power (w)
Total 946nm 1064nm
圖 5.3.5：平面輸出耦合鏡對波長 1064 nm 高穿透率鍍膜(T>99%)之 雙波長雷射輸出功率圖
0 4 8 12 16 20 24 0
1 2 3 4 5 6
Output Power (w)
Input Power (w)
Total 946nm 1064nm
圖 5.3.6：平面輸出耦合鏡對波長 1064 nm 部分反射率 R=10%鍍膜之 雙波長雷射輸出功率圖
由以上雙波長的實驗結果可以看出，由於我們選用長度僅 2 mm 的
由以上的實驗結果與討論，充分說明了，此架構是一種相當有效 率、簡單、可調且有實用價值的雙波長雷射架構。對於雙波長雷射在各 方面的應用上，應可提供很大的助益[35-45]。
第六章 結論與展望
雷射是個令人感到興趣的課題[6][12][17]。再者，雙波長的倍頻或合頻 轉換，即波長 946 nm 倍頻轉換為波長 473 nm 藍光雷射，波長 1064 nm 倍頻轉換為波長 532 nm 綠光雷射，或波長 946 nm 加波長 1064 nm 合頻 轉換為波長 501 nm 綠光雷射，亦是值得研究的方向[16-17]。而更進一 步的三波長雷射之研究，更是我們迫不及待想從事的目標。相信以現有 基礎，應可在可預期的將來，對雙波長或三波長雷射的理論與架構，建 立出一套更完整而有系統的模式。
參考文獻
[1]姚健全,徐德剛 , "全固態激光及非線性光學頻率轉換技術" ,科學出版 社(2007)
[2] J. Machan, R. Kurtz, M. Bass, M. Birnbaum, and M. Kokta,
"Simultaneous, multiple wavelength lasing of (Ho,Nd):Y3Al5O12," Appl.
Phys. Lett. 51, 1313-1315 (1987).
[3] W. Q. Shi, R. Kurtz, J. Machan, M. Bass, M. Birnbaum, and M. Kokta,
"Simultaneous, multiple wavelength lasing of (Er, Nd):Y3Al5O12," Appl.
Phys. Lett. 51, 1218-1220 (1987).
[4] H. Y. Shen, R. R. Zeng, Y. P. Zhou, G. F. Yu, C. H. Huang, Z. D. Zeng, W.
J. Zhang, and Q. J. Ye, "Comparison of simultaneuos multiple wavelength lasing in various neodymium host crystal at transition from
4F3/2－4I11/2 and 4F3/2－4I13/2," Appl. Phys. Lett. 56, 1937-1939 (1990).
[5] R. Zhou, W. Wen, Z. Cai, X. Ding, P. Wang, and J. YAO, "Efficient stable simultaneous CW dual-wavelength at 1.319 and 1.338 μm," Chinese Optics Lett. Vol. 3, No. 10, (2005).
[6] J. L. He, J. Du, J. Sun, S. Liu, Y. X. Fan, H. T. Wang, L. H. Zhang, Y.
Hang, "High efficiency single- and dual-wavelength Nd:GdVO4 lasers pumped by a fiber-coupled diode," Appl. Phys. B 79, 301-304 (2004).
[8] Y. F. Lu, X. H. Zhang, J. Xia, G. Y. Jin, J. G. Wang, X. D. Yin, and A. F.
Zhang, "1064 nm Nd:YAG laser intracavity pumped at 946 nm and sum-frequency mixing for an emission at 501 nm," Laser Phys. Lett. 7, 335-338 (2010).
[9] Y. Lu, B. Zhang, E. Li, D. Xu, R. Zhou, X. Zhao, F. Ji, T. Zhang, P. Wang, J. Yao, "High-power simultaneous dual-wavelength emission of an end-pumped Nd:YAG laser using the quasi-three-level and the four-level transition," Optics Communication 262, 241-245 (2006).
[10] N. Pavel, "Simultaneous Dual-Wavelength Emission at 0.90 and 1.06μm in Nd-doped Laser Crystals," Laser Physics 20, 215-221(2010).
[11] P. Li, D. Li, C. Li, and Z. Zhang, "Simultaneous dual-wavelength continuous wave laser operation at 1.06 μm and 946 nm in Nd:YAG and their frequency doubling," Optics Communication 235,169-174 (2004).
[12] 王君偉 ,"準三能階被動式 Q 開關藍光雷射的研究"中山大學碩士論 文(2001)
[13] W. P. Risk and W. Lenth, "Room-temperature, continuous-wave, 946-nm Nd:YAG laser pumped by laser-diode arrays and intracavity
laser with intracavity sum-frequency mixing," Optics Lett. Vol. 27, No. 6 (2002).
[18] W. Koechner, Solid-State Laser Engineering Springer 5th. Herndon, ch 2.
[19] J. E. Geusic, H. M. Marcos, L. G. Van Uitert,"Laser oscillations in Nd-doped yttrium aluminum, yttrium gallium and gadolinium garnets,"
Appl. phys. Lett. 4, 182(1964).
[20] D. Pruss, G. Huber, A. Beimowski, V. V. Laptev,"Efficient Cr3+ sesitized Nd3+: GdScGa-garnet laser at 1.06μm," Appl. Phys. B 28, 355-358 (1982).
[21] R. C. Powell, Physics of Solid-State Laser Materials. New York (1998).
[22] T. Yokozawa, H. Hara,"Laser-diode end-pumped Tm3+:YAG eye-safe laser," Appl. Opt. 35, 1424-1426 (1996)
[23] D.Hargis and A. Earman,"Diode-pumped microlasers promise portable projectors," Laser Focus World, pp. 243-251(1998).
[24] Y. Zhao, S. Fleming and S. Poole,"22 mW blue output power from a Pr3+ fluoride fiber upconversion laser," Optics Communication, Vol. 114, pp. 285-288(1995).
[25] D. Fluck and P. Gunter,"Efficient generation of CW blue light by
KTiOPO4 crystal," Optics Letters, Vol. 24, No. 4, pp. 205-207(1999).
[27] H. Jones-Bey,"Expiring license opens field for solid-state blue laser,"
Laser Focus World, pp. 133-137(2000).
[28] P. Zeller and P. Peuser,"Efficient, multiwatt, continuous-wave laser operation on the 4F3/2-4I9/2 transition of Nd:YVO4 and Nd:YAG," Optics Letters, Vol. 25, No. 1, pp. 34-36(2000).
[29]T. Kellner, F. Heine, V. Ostroumov, G. Huber,"High power diode-pumped intracavity frequency doubled CW Nd:YAG laser at 473 nm," Advanced Solid-state Laser, Vol. 10,(1997).
[30] A. Yariv, Optical Electronics in Modern Communications 5th, HBJ Saunder, ch. 6.
[31] T. Y. Fan and R. L. Byer,"Diode laser-pumped solid-statd lasers," IEEE J. Quantum Electron, Vol. 24, No. 6, pp. 895-912(1998).
[32] P. A. Franken, A. E. Hill, C. W. Peter, and G. Weinreich,"Generation of optical harmonics," Phy. Rev. Lett. Vol. 7, pp. 118(1961).
[33] A. Yariv, Optical Electronics in Modern Communication, New York, Oxford.
Opt. Express 18, 9518-9524 (2010).
[36] H. C. Liang, Y. J. Huang, W. C. Huang, K. W. Su, and Y. F. Chen,
"High-power, diode-end-pumped, multigigahertz self-mode-locked Nd:YVO4 laser at 1342 nm," Opt. Lett. 35, 4-6 (2010).
[37] J. Y. Huang, W. Z. Zhuang, W. C. Huang, K. W. Su, C. Hu, K. F. Huang, and Y. F. Chen, "Comparative studies for Cr4+:YAG crystal and AlGaInAs semiconductor used as a saturable absorber in Q-switched Yb-doped fiber lasers," Opt. Express 17, 20800-20805 (2009).
[38] S. C. Huang, H. L. Cheng, Yi-Fan Chen, K. W. Su, Y. F. Chen, and K. F.
Huang, "Diode-pumped passively mode-locked 1342 nm Nd:YVO4 laser with an AlGaInAs quantum-well saturable absorber,"Opt. Lett. 34, 2348-2350 (2009).
[39] H. C. Liang, H. L. Chang, W. C. Huang, K. W. Su, Y. F. Chen, and Y. T.
Chen, "Self-mode-locked Nd:GdVO4 laser with multi-GHz oscillations:
manifestation of third-order nonlinearity," Appl. Phys. B 97, 451-455 (2009).
[40] J. Y. Huang, W. C. Huang, W. Z. Zhuang, K. W. Su, Y. F. Chen, and K. F.
Huang, "High-pulse-energy, passively Q-switched Yb-doped fiber laser with AlGaInAs quantum wells as a saturable absorber," Opt. Express 16,
4I13/2 transitions," Opt. Express 16, 21155-21160 (2008).
[42] Y.P. Huang, K.W. Su, A. Li, Y.F. Chen, and K.F. Huang,
"High-peak-power passively Q-switched Nd:YAG laser at 946 nm," Appl.
Phys. B 91, 429-432 (2008).
[43] J. Y. Huang, S. C. Huang, H. L. Chang, K. W. Su, Y. F. Chen, and K. F.
Huang, "Passive Q switching of Er-Yb fiber laser with semiconductor saturable absorber," Opt. Express 16, 3002-3007 (2008).
[44] Y. P. Huang, H. C. Liang, J. Y. Huang, K. W. Su, A. Li, Y. F. Chen, and K. F. Huang, "Semiconductor quantum-well saturable absorbers for efficient passive Q switching of a diode-pumped 946 nm Nd:YAG laser,"
Appl. Opt. 46, 6273-6276 (2007).
[45] Y. F. Chen, Y. S. Chen, T. H. Ou, and K. W. Su, "Compact efficient diode-pumped Nd:YVO4 Q-switched blue laser with intracavity frequency tripling," Appl. Phys. B 81, 517-520 (2005).