中国物理B ›› 2008, Vol. 17 ›› Issue (11): 4199-4203.doi: 10.1088/1674-1056/17/11/040

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Superposition of orbital angular momentum of photons by a combined computer-generated hologram fabricated in silica glass with femtosecond laser pulses

曲士良1, 孙正和1, 郭忠义2, 刘树田3   

  1. (1)Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China; (2)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China; (3)Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
  • 收稿日期:2008-02-25 修回日期:2008-03-19 出版日期:2008-11-20 发布日期:2008-11-20
  • 基金资助:
    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).

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   

  1. a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
  • Received:2008-02-25 Revised:2008-03-19 Online:2008-11-20 Published:2008-11-20
  • Supported by:
    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).

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摘要： 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.

关键词: femtosecond laser, micro-structure, optical vortices, CGH

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.

Key words: femtosecond laser, micro-structure, optical vortices, CGH

中图分类号:  (Computer-generated holograms)

  • 42.40.Jv
42.40.Eq (Holographic optical elements; holographic gratings) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 42.70.Ce (Glasses, quartz)