Superposition of orbital angular momentum of photons by a combined computer-generated hologram fabricated in silica glass with femtosecond laser pulses
Guo Zhong-Yi (郭忠义)ab, Qu Shi-Liang (曲士良)b, Sun Zheng-He (孙正和)b, Liu Shu-Tian (刘树田)ab
aDepartment of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
Abstract This paper introduces a novel method to realize the superposition of orbital angular momentum of photons by combined computer-generated hologram (CCGH) fabricated in silica glass with femtosecond laser pulses. Firstly, the two computer-generated holograms (CGH) of optical vortex were obtained and combined as a CCGH according to the design. Then the CCGH was directly written inside glass by femtosecond laser pulses induced microexplosion without any pre- or post-treatment of the material. The vortex beams with different vortex topological charges (including new topological charges) have been restructured using a collimated He--Ne laser beam incidence to the CCGH normally. A theoretical and experimental explanation has been presented for the generations of the new topological charges.
Received: 25 February 2008
Revised: 19 March 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10674038 and
10604042), National Basic Research Program of China (Grant No
2006CB302901), the Multidiscipline Scientific Research Foundation of
Harbin Institute of Technology, China (Grant No HIT.MD2003.22), and
the Foundation of Harbin Institute of Technology at Weihai of China
(Grant No HIT(WH).2005.20).
Cite this article:
Guo Zhong-Yi (郭忠义), Qu Shi-Liang (曲士良), Sun Zheng-He (孙正和), Liu Shu-Tian (刘树田) Superposition of orbital angular momentum of photons by a combined computer-generated hologram fabricated in silica glass with femtosecond laser pulses 2008 Chin. Phys. B 17 4199
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