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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 Liu Shu-Tian |
| Affiliation: | 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 oforbital angular momentum of photons by combined computer-generatedhologram (CCGH) fabricated in silica glass with femtosecond laserpulses. Firstly, the two computer-generated holograms (CGH) ofoptical vortex were obtained and combined as a CCGH according to thedesign. Then the CCGH was directly written inside glass byfemtosecond laser pulses induced microexplosion without any pre- orpost-treatment of the material. The vortex beams with differentvortex topological charges (including new topological charges) havebeen restructured using a collimated He--Ne laser beam incidence tothe CCGH normally. A theoretical and experimental explanation hasbeen presented for the generations of the new topological charges. |
| Keywords: | femtosecond laser micro-structure optical vortices CGH |
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