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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 |
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| Authors: | Guo Zhong-Yi Qu Shi-Liang Sun Zheng-He and Liu Shu-Tian |
| Institution: | Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China; Department of Physics, Harbin Institute of Technology, Harbin 150001, China;Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China; Department of Physics, Harbin Institute of Technology, Harbin 150001, China;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. |
| Keywords: | femtosecond laser micro-structure optical vortices CGH |
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