Efficiency pedestal in quasi-phase-matching devices with random duty-cycle errors |
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Authors: | Pelc J S Phillips C R Chang D Langrock C Fejer M M |
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Affiliation: | E L Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. jpelc@stanford.edu |
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Abstract: | It is shown that random duty-cycle errors in quasi-phase-matching (QPM) nonlinear optical devices enhance the efficiency of processes far from the QPM peak. An analytical theory is shown to agree well with numerical solutions of second-harmonic generation (SHG) in disordered QPM gratings. The measured efficiency of 1550?nm band SHG in a periodically poled lithium niobate (PPLN) waveguide away from the QPM peak agrees with observations of domain disorder in a PPLN wafer by Zygo interferometry. If suppression of parasitic nonlinear interactions is important in a specific application of QPM devices, control of random duty-cycle errors is critical. |
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