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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
[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 物理学报 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 物理学报 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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