Abstract
Nonlinear frequency conversion is an attractive technique for extending the spectral range of solid-state coherent sources. Waveguide interactions are useful to increase the efficiency of devices based on low-power pump lasers, e.g. second harmonic generation (SHG) of the output of AlGaAs laser diodes to produce blue light. While the large nonlinear susceptibility and well-developed waveguide technologies available in LiNbO3 are attractive for device design, LiNbO3 does not have adequate birefringence for phasematching SHG of blue light. Compensating for phase-velocity mismatch by reversing the sign of the nonlinear susceptibility with a period equal to the coherence length, quasi-phase-matching (QPM), allows phase-matching of any interaction within the transparency range of the crystal using the large d33 nonlinear coefficient. QPM has been investigated in LiNbO3 waveguides, where the sign changes were due to periodic reversal of the orientation of the ferroelectric domains accomplished by a patterned doping process.1-3 We have succeeded in generating green and blue light by QPM SHG of the output of infrared lasers in such waveguides.
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