Open AccessIn-phased second harmonic wave array generation with intra-Talbot-cavity frequency-doubling
Author(s) -
Kenichi Hirosawa,
Fumio Shohda,
Takayuki Yanagisawa,
Fumihiko Kannari
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.007703
Subject(s) - talbot effect , optics , phased array , phase (matter) , physics , second harmonic generation , laser , harmonic , high harmonic generation , diffraction , acoustics , telecommunications , quantum mechanics , computer science , antenna (radio)
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.