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由于超短脉冲激光器的谐振腔大都采用多镜折叠的形式, 像散已成为影响锁模激光器性能优劣的重要问题. 本文提出了一种基于传播圆补偿像散的被动锁模激光器谐振腔设计方法, 该方法简单、直观、高效, 容易找到补偿像散的最佳位置. 理论研究表明, 当SESAM位于子午和弧矢传播圆交汇处附近时, SESAM处的子午光斑和弧矢光斑大小几乎相等, 像散得到补偿. 该谐振腔对外界干扰引起的腔镜振动和热透镜焦距的变化均不敏感, 谐振腔的抗干扰性很强. 实验研究表明, 当SESAM位于子午和弧矢传播圆交汇处附近时,锁模激光器可获得稳定连续的锁模激光脉冲, 且激光器的抗干扰性很强. 本文的理论研究与实验结果相一致.The cavities of ultrashort pulsed lasers are mostly based on folded resonators with multi-mirrors. Astigmatism is an important issue to affect the performance of the mode-locked laser. An effective method of astigmatic ally compensating a continuous-wave passively mode-locked laser is presented in this paper. This method, in which the resonator propagation circle graphic theory is used, is easy and intuitive to seek the optimal location of the semiconductor saturable absorber mirror (SESAM), where the astigmatism can be compensated. Theoretical results show that the tangential and the sagittal spot size at the SESAM are equal and that the astigmatism can be compensated, when an SESAM is located at the tangential and the sagittal propagation circle intersection. The mode-locked resonator is insensitive to external perturbation including the vibration and the change of the thermal lens focal length, which leads to the instability of the mode locking operation. The antijamming ability of the resonator is outstanding. The experimental results indicate that the mode-locked laser works in a stabilized continuous-wave mode locking state and operates extremely steadily, when the SESAM is located at the tangential and the sagittal propagation circle intersection. The experimental results of the mode locking lasers show good agreement with the theoretical studies.
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Keywords:
- continues wave mode-locked /
- astigmatic compensation /
- semiconductor saturable absorber mirror /
- propagation circle
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[2] Torben S, Thomas M, Kjartan F, Soren L F, Christian P 2005 J. Opt. A: Pure Appl. Opt. 7 645
[3] Huang K G, Lee W K, Wong S P, Zhou J Y, Yu Z X 1996 J. Opt. Soc. Am. B: Opt. Phys. 13 2863
[4] Wen Q, Sun L Q, Wang Y G, Zhang E Y, Tian Q 2009 Opt. Express 11 8956
[5] Zhang G Y, Guo S G 2003 Graphic Analysis and Design Method of Optical Resonator (Beijing: National Defence Industry Press) pp1-10 (in Chinese) [张光寅, 郭曙光 2003 光学谐振腔的图解分析与设计方法(北京:国防工业出版社) 第1–10页]
[6] Geng A C, Zhao C, Bo Y, Lu Y F, Xu Z Y 2008 Acta Phys. Sin. 57 6987 (in Chinese) [耿爱丛, 赵慈, 薄勇, 鲁远甫, 许祖彦 2008 57 6987]
[7] Song F, Zhang C B, Ding X,Xu J J, Zhang G Y, Leigh M, Peyghambarian N 2002 Appl. Phys. Lett. 81 2145
[8] L B D 2003 Laser Optics-Beam Characterization, Propagation and Transformation, Resonator Technology and Physics (3th Ed.) (Beijin:Higher Education Press) p390 (in Chinese) [吕百达 2003 激光光学–光束描述、传输变换与光腔技术物理(第三版)(北京:高等教育出版社) 第390页]
[9] Koechner W 2006 Solid-State Laser Engineering (Sixth Edition) (New York: Springer Science+Business Media)
[10] Magni V 1986 Appl. Optics 25 107
[11] Lancaster D G, Dawes J M 1998 Opt. Laser Technol. 30 103
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[1] Keller U, Miller D A B, Boyd G D, Chiu T H, Ferguson J F, Asom M T 1992 Opt. Lett. 17 505
[2] Torben S, Thomas M, Kjartan F, Soren L F, Christian P 2005 J. Opt. A: Pure Appl. Opt. 7 645
[3] Huang K G, Lee W K, Wong S P, Zhou J Y, Yu Z X 1996 J. Opt. Soc. Am. B: Opt. Phys. 13 2863
[4] Wen Q, Sun L Q, Wang Y G, Zhang E Y, Tian Q 2009 Opt. Express 11 8956
[5] Zhang G Y, Guo S G 2003 Graphic Analysis and Design Method of Optical Resonator (Beijing: National Defence Industry Press) pp1-10 (in Chinese) [张光寅, 郭曙光 2003 光学谐振腔的图解分析与设计方法(北京:国防工业出版社) 第1–10页]
[6] Geng A C, Zhao C, Bo Y, Lu Y F, Xu Z Y 2008 Acta Phys. Sin. 57 6987 (in Chinese) [耿爱丛, 赵慈, 薄勇, 鲁远甫, 许祖彦 2008 57 6987]
[7] Song F, Zhang C B, Ding X,Xu J J, Zhang G Y, Leigh M, Peyghambarian N 2002 Appl. Phys. Lett. 81 2145
[8] L B D 2003 Laser Optics-Beam Characterization, Propagation and Transformation, Resonator Technology and Physics (3th Ed.) (Beijin:Higher Education Press) p390 (in Chinese) [吕百达 2003 激光光学–光束描述、传输变换与光腔技术物理(第三版)(北京:高等教育出版社) 第390页]
[9] Koechner W 2006 Solid-State Laser Engineering (Sixth Edition) (New York: Springer Science+Business Media)
[10] Magni V 1986 Appl. Optics 25 107
[11] Lancaster D G, Dawes J M 1998 Opt. Laser Technol. 30 103
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