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

作者：Guo Zhong Yi^*; Qu Shi Liang; Sun Zheng He; Liu Shu Tian

来源：Chinese Physics B, 2008, 17(11): 4199-4203.

DOI：10.1088/1674-1056/17/11/040

• femtosecond laser
• micro-structure
• optical vortices
• CGH

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.

• 出版日期2008-11
• 单位哈尔滨工业大学