In-phased second harmonic wave array generation with intra-Talbot-cavity frequency-doubling

Kenichi Hirosawa, Fumio Shohda, Takayuki Yanagisawa, Fumihiko Kannari

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The Talbot cavity is one promising method to synchronize the phase of a laser array. However, it does not achieve the lowest array mode with the same phase but the highest array mode with the anti-phase between every two adjacent lasers, which is called out-phase locking. Consequently, their far-field images exhibit 2-peak profiles. We propose intra-Talbot-cavity frequency-doubling. By placing a nonlinear crystal in a Talbot cavity, the Talbot cavity generates an out-phased fundamental wave array, which is converted into an in-phase-locked second harmonic wave array at the nonlinear crystal. We demonstrate numerical calculations and experiments on intra-Talbot-cavity frequency-doubling and obtain an in-phase-locked second harmonic wave array for a Nd:YVO<inf>4</inf> array laser.

Original languageEnglish
Pages (from-to)7703-7712
Number of pages10
JournalOptics Express
Issue number6
Publication statusPublished - 2015 Mar 23


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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