Red-Shift Conical Emission by Femtosecond Pulses at Low Input Power
LI Yue-Xun, JI Zhong-Gang, ZENG Zhi-Nan, LIU Jian-Sheng, GE Xiao-Chun, LI Ru-Xin, XU Zhi-Zhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai 201800
Red-Shift Conical Emission by Femtosecond Pulses at Low Input Power
LI Yue-Xun, JI Zhong-Gang, ZENG Zhi-Nan, LIU Jian-Sheng, GE Xiao-Chun, LI Ru-Xin, XU Zhi-Zhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai 201800
摘要Red-shift conical emission (CE) is observed by femtosecond laser pulse propagating in BK7 at a low input power (compared to those input powers for generation of blue-shift CE). With the increasing input power the blue-shift CE begins to appear whereas the red-shift CE ring (902nm in our experiment) disappears accompanied by the augment of the central white spot size synchronously. The disappearing of red-shift CE in our experiment is explained such that the increase of axial intensity is much higher than that of ring emission and the augment of the central white spot size with the increasing input laser power.
Abstract：Red-shift conical emission (CE) is observed by femtosecond laser pulse propagating in BK7 at a low input power (compared to those input powers for generation of blue-shift CE). With the increasing input power the blue-shift CE begins to appear whereas the red-shift CE ring (902nm in our experiment) disappears accompanied by the augment of the central white spot size synchronously. The disappearing of red-shift CE in our experiment is explained such that the increase of axial intensity is much higher than that of ring emission and the augment of the central white spot size with the increasing input laser power.
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2008, Vol. 25 
