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Generation of tunable blue–green light using ZnO periodically poled lithium niobate crystal fiber by self-cascaded second-order nonlinearity

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Abstract

Using a novel self-cascaded first-order second-harmonic generation (SHG) and third-order sum-frequency generation (SFG) in a ZnO periodically poled lithium niobate crystal fiber, tunable blue–green light was demonstrated. At a domain pitch of 15.45μm, the SHG signal and its fundamental signal at 1423.9nm can satisfy the third-order SFG quasi-phase-matched (QPM) condition. The measured SHG power at 714.2nm was 12.25mW under 100mW input power, and the estimated nonlinear coefficient (d33) achieved was 25.3pmV. The self-cascaded SHG+SFG power measured at 477.1nm was 700μW under 350mW input power. The maximum internal efficiency of the SHG is 14.84%. The tuning range of the self-cascaded SHG and SFG generated tunable blue–green light was more than 40nm, from 471.3 to 515nm. The maximum simulated 3dB bandwidth achieved using a gradient-period QPM structure is 196nm, which is from 1476 to 1672nm. The gain-bandwidth product of the self-cascaded SHG and SFG processes decreases drastically as the bandwidth is broadened.

© 2007 Optical Society of America

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