title: In-phased second harmonic wave array generation with intra-Talbot-cavity frequency-doubling.
abstract: 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:YVO₄ array laser.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hirosawa
authors.forename: Fumio
authors.initials: F
authors.lastname: Shohda
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yanagisawa
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kannari