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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

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Front Optoelec Chin    2011, Vol. 4 Issue (4) : 407-410    https://doi.org/10.1007/s12200-011-0147-8
RESEARCH ARTICLE
Angular feature of conical emission in an isotropic amorphous medium pumped by femtosecond pulses
Jie BI1,2()
1. School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China; 2. Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

Broadband parametric upconverted conical emission (CE) has been investigated in an isotropic amorphous medium pumped by femtosecond laser pulses, which covers a broad range from 470 to 630 nm. Three theoretical models were analyzed to interpret the angular beam of CE. The CE spectra and their angular positions have been experimentally measured, which can be explained well by nonlinear X-wave model and Cerenkov type phase matching model rather than four-wave mixing (FWM) model.
Keywords conical emission (CE)      femtosecond laser pulses      four-wave mixing (FWM)      Cerenkov type process      X-wave model     
Corresponding Author(s): BI Jie,Email:feelingbj@hotmail.com   
Issue Date: 05 December 2011
 Cite this article:   
Jie BI. Angular feature of conical emission in an isotropic amorphous medium pumped by femtosecond pulses[J]. Front Optoelec Chin, 2011, 4(4): 407-410.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-011-0147-8
https://academic.hep.com.cn/foe/EN/Y2011/V4/I4/407
Fig.1  (a) Setup employed in the experiment. HW, a half-wave plate in 800 nm; P, polarizer; L, lens with focus length of 20 cm; G, 1 cm-thick BK-7 glass; I, an iris with 0.5 mm diameter; (b) a typical picture of colored CE around SC
Fig.2  Measured CE spectra from 470 to 630 nm at different conical angles
Fig.3  Schematic representation of FWM process
Fig.4  Schematic representation of Cerenkov type phase matching process
Fig.5  CE angular spectra experimentally measured are compared with those of three theoretical models in BK-7 glass
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