Abstract
Using a novel self-cascaded first-order second-harmonic generation (SHG) and third-order sum-frequency generation (SFG) in a periodically poled lithium niobate crystal fiber, tunable blue–green light was demonstrated. At a domain pitch of , the SHG signal and its fundamental signal at can satisfy the third-order SFG quasi-phase-matched (QPM) condition. The measured SHG power at was under input power, and the estimated nonlinear coefficient achieved was . The self-cascaded power measured at was under 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 , from 471.3 to . The maximum simulated bandwidth achieved using a gradient-period QPM structure is , which is from 1476 to . 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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