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采用单端连续抽运方式, 对自由运转的双包层掺镱光纤激光器的输出特性进行了详细的实验研究. 实验中不但观察到了自脉冲, 而且首次在自由运转的光纤激光器中观察到自锁模现象, 对它们产生的物理机理进行了相应的理论分析. 分析表明: 增益光纤的弱(未) 抽运部分对信号光的吸收导致光纤激光器内自脉冲的出现, 轴向模之间的拍频和自相位调制导致自锁模现象的出现, 而受激拉曼散射、 受激布里渊散射等非线性效应使它们进一步增强. 当抽运光功率略高于阈值时, 自脉冲宽度比较宽, 随抽运光功率增加自脉冲的脉宽变窄; 自脉冲包络面内的自锁模脉冲的宽度随抽运光功率增加也变窄, 进一步增加抽运光功率, 自脉冲和自脉冲包络面内的自锁模现象消失. 实验测得自锁模脉冲的间隔为224 ns, 最大(小) 自锁模脉冲的半高全宽约为35.0 ns (6.3 ns); 测得信号光的中心波长为1090 nm, 谱线半高全宽的最大(小) 值约为7.05 nm (2.01 nm).The output characteristics of a continuous-wave diode pumped free-running double-clad ytterbium-doped fiber laser are investigated. In the experiment, not only self-pulsing is observed, but also self-mode-locking is observed for the first time in the free-running fiber laser. The physical mechanism responsible for these phenomena is analyzed. The analysis reveals that the signal is absorbed in the weakly pumped or non-pumped part of the active fiber, which leads the self-pulsing to be present, and self-mode-locking is induced by axial mode beating and self-phase modulation, which are enhanced by nonlinear effects, stimulated Raman scattering, and stimulated Brillouin scattering. The pulse width of self-pulsing decreases as pump power increases. The pulse width of self-mode-locking pulses becomes narrow with the increase of the pump power. When the pump power is higher than 8 W, self-pulsing and self-mode-locking disappear. The interval between adjacent self-mode-locking pulses is 224 ns, corresponding to the cavity round-trip time. The maximum and the minimum durations (full width at half maximum) of self-mode locked pulses are about 35.0 ns and 6.3 ns respectively, and the maximum and minimum spectral widths (full width at half maximum) of signal light are about 7.05 nm and 2.01 nm respectively.
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Keywords:
- fiber laser /
- self-pulsing /
- self-mode-locking
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[2] Rangel-Rojo R, Mohebi M 1997 Opt. Commun. 137 98
[3] Hideur A, Chartier T, Õzkul C, Sanchez F 2000 Opt. Commun. 186 311
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[5] Leblond H, Salhi M, Hideur A, Chartier T, Brunel M, Sanchez F 2002 Phys. Rev. A 65 63811
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[7] Brunet F, Taillon Y, Galarneau P, LaRochelle S 2005 J. Lightwave Technol. 23 2131
[8] Wang Y G, Ma X Y, Fu S G, Fan W D, Li Q, Yuan S Z, Dong X Y, Song Y R, Zhang Z G 2004 Acta Phys. Sin. 53 1810 (in Chinese) [王勇刚, 马骁宇, 付圣贵, 范万德, 李 强, 袁树忠, 董孝义, 宋晏蓉, 张志刚 2004 53 1810]
[9] Li J, Ueda K, Musha M, Shirakawa A, Zhong L 2006 Appl. Phys. B 85 565
[10] Upadhyaya B, Chakravarty U, Kuruvilla A, Oak S, Shenoy M, Thyagarajan K 2010 Opt. Commun. 283 2206
[11] Song Y J, Hu M L, Liu Q W, Li J Y, Chen W, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 5045 (in Chinese) [宋有建, 胡明列, 刘庆文, 李进延, 陈 伟, 柴 路, 王清月 2008 57 5045]
[12] Upadhyaya B, Kuruvilla A, Chakravarty U, Shenoy M, Thyagarajan K, Oak S 2010 Appl. Opt. 49 2316
[13] Jeong Y, Sahu J, Payne D, Nilsson J 2004 Opt. Express 12 6088
[14] Lou Q H, He B, Xue Y H, Zhou J, Dong J X, Wei Y R, Wang W, Li Z, Qi Y F, Du S T 2009 Chin. J. Lasers 36 1277 (in Chinese) [楼祺洪, 何兵, 薛宇豪, 周军, 董景星, 魏运荣, 王炜, 李 震, 漆云凤, 杜松涛 2009 中国激光 36 1277]
[15] Jeong Y C, Boyland A J, Sahu J K, Chung S H, Nilsson J, Payne D N 2009 J. Opt. Soc. Korea 13 416
[16] Tsang Y, King T, Ko D, Lee J 2006 Opt. Commun. 259 236
[17] Colin S, Contesse E, Boudec P, Stephan G, Sanchez F 1996 Opt. Lett. 21 1987
[18] Sanchez F, LeBoudec P, François P L, Stephan G 1993 Phys. Rev. A 48 2220
[19] Chernikov S, Zhu Y, Taylor J, Gapontsev V 1997 Opt. Lett. 22 298
[20] Salhi M, Hideur A, Chartier T, Brunel M, Martel G, Ozkul C, Sanchez F 2002 Opt. Lett. 27 1294
[21] Kir'yanov A, Barmenkov Y 2006 Laser Phys. Lett. 3 498
[22] MartÍnez-Rios A, Torres-Gómez I, Anzueto-Sanchez G, Selvas-Aguilar R 2008 Opt. Commun. 281 663
[23] Upadhyaya B N, Chakravarty U, Kuruvilla A, Nath A K, Shenoy M R, Thyagarajan K 2008 Opt. Commun. 281 146
[24] Upadhyaya B, Chakravarty U, Kuruvilla A, Thyagarajan K, Shenoy M, Oak S 2007 Opt. Express 15 11576
[25] Jun C S, Kim B Y 2011 Opt. Express 19 6290
[26] Agrawal G P 2002 Fiber-Optic Communication Systems (3rd Ed.) (New York: John Wiley and Sons Inc.) pp59--62
[27] Dawson J W, Messerly M J, Beach R J, Shverdin M Y, Stappaerts E A, Sridharan A K, Pax P H, Heebner J E, Siders C W, Barty C 2008 Opt. Express 16 13240
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[1] Myslinski P, Chrostowski J, Koningstein J A K, Simpson J R 1993 Appl. Opt. 32 286
[2] Rangel-Rojo R, Mohebi M 1997 Opt. Commun. 137 98
[3] Hideur A, Chartier T, Õzkul C, Sanchez F 2000 Opt. Commun. 186 311
[4] Jackson S 2002 Electron. Lett. 38 1640
[5] Leblond H, Salhi M, Hideur A, Chartier T, Brunel M, Sanchez F 2002 Phys. Rev. A 65 63811
[6] Wang Y, Martinez-Rios A, Po H 2003 Opt. Commun. 224 113
[7] Brunet F, Taillon Y, Galarneau P, LaRochelle S 2005 J. Lightwave Technol. 23 2131
[8] Wang Y G, Ma X Y, Fu S G, Fan W D, Li Q, Yuan S Z, Dong X Y, Song Y R, Zhang Z G 2004 Acta Phys. Sin. 53 1810 (in Chinese) [王勇刚, 马骁宇, 付圣贵, 范万德, 李 强, 袁树忠, 董孝义, 宋晏蓉, 张志刚 2004 53 1810]
[9] Li J, Ueda K, Musha M, Shirakawa A, Zhong L 2006 Appl. Phys. B 85 565
[10] Upadhyaya B, Chakravarty U, Kuruvilla A, Oak S, Shenoy M, Thyagarajan K 2010 Opt. Commun. 283 2206
[11] Song Y J, Hu M L, Liu Q W, Li J Y, Chen W, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 5045 (in Chinese) [宋有建, 胡明列, 刘庆文, 李进延, 陈 伟, 柴 路, 王清月 2008 57 5045]
[12] Upadhyaya B, Kuruvilla A, Chakravarty U, Shenoy M, Thyagarajan K, Oak S 2010 Appl. Opt. 49 2316
[13] Jeong Y, Sahu J, Payne D, Nilsson J 2004 Opt. Express 12 6088
[14] Lou Q H, He B, Xue Y H, Zhou J, Dong J X, Wei Y R, Wang W, Li Z, Qi Y F, Du S T 2009 Chin. J. Lasers 36 1277 (in Chinese) [楼祺洪, 何兵, 薛宇豪, 周军, 董景星, 魏运荣, 王炜, 李 震, 漆云凤, 杜松涛 2009 中国激光 36 1277]
[15] Jeong Y C, Boyland A J, Sahu J K, Chung S H, Nilsson J, Payne D N 2009 J. Opt. Soc. Korea 13 416
[16] Tsang Y, King T, Ko D, Lee J 2006 Opt. Commun. 259 236
[17] Colin S, Contesse E, Boudec P, Stephan G, Sanchez F 1996 Opt. Lett. 21 1987
[18] Sanchez F, LeBoudec P, François P L, Stephan G 1993 Phys. Rev. A 48 2220
[19] Chernikov S, Zhu Y, Taylor J, Gapontsev V 1997 Opt. Lett. 22 298
[20] Salhi M, Hideur A, Chartier T, Brunel M, Martel G, Ozkul C, Sanchez F 2002 Opt. Lett. 27 1294
[21] Kir'yanov A, Barmenkov Y 2006 Laser Phys. Lett. 3 498
[22] MartÍnez-Rios A, Torres-Gómez I, Anzueto-Sanchez G, Selvas-Aguilar R 2008 Opt. Commun. 281 663
[23] Upadhyaya B N, Chakravarty U, Kuruvilla A, Nath A K, Shenoy M R, Thyagarajan K 2008 Opt. Commun. 281 146
[24] Upadhyaya B, Chakravarty U, Kuruvilla A, Thyagarajan K, Shenoy M, Oak S 2007 Opt. Express 15 11576
[25] Jun C S, Kim B Y 2011 Opt. Express 19 6290
[26] Agrawal G P 2002 Fiber-Optic Communication Systems (3rd Ed.) (New York: John Wiley and Sons Inc.) pp59--62
[27] Dawson J W, Messerly M J, Beach R J, Shverdin M Y, Stappaerts E A, Sridharan A K, Pax P H, Heebner J E, Siders C W, Barty C 2008 Opt. Express 16 13240
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