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We have theoretically demonstrated the simultaneous generation of red (R), green (G), and blue (B) wavelengths by employing the type-0 quasi-phase-matched (QPM) difference frequency generation (DFG) process in congruent LiNbO3 crystal. Various domain-engineered QPM structures are presented and analysed, aiming to achieve an excellent spectral response. The RGB emissions were observed to vary from 632 nm to 656 nm for red, 504 nm to 532 nm for green, and 449 nm to 484 nm for blue, respectively, for different configurations of input pump, operating temperature, and phase matching periods. A maximum shift of about 10 nm to 20 nm was noticed in the spectral position of the DFG peaks when the operating temperature varies from 25 °C to 60 °C. We have also investigated the effect of pump detuning and random domain fluctuations over the phase matching point on the DFG spectrum. Further, we have addressed the advantages of introducing a phase shifter (PS) domain in the periodically poled lithium niobate (PPLN) to produce excellent equal intensity RGB peaks in a single device for their potential application in a laser-based projection display system. [ABSTRACT FROM AUTHOR]

The presence of fabrication errors in domain engineered quasi-phase-matching (QPM) device directly affects its performance in a nonlinear optical process. The existence of error in the aspect ratio affects the conversion efficiency factor. In this paper, we theoretically analyzed the effect of aspect ratio errors in QPM device. Further, the effect of duty cycle error and incomplete domain inversion on conversion efficiency is also studied for various grating profiles like under-poled, rectangular, and blazed. Their generalized phase profile equations representing the nonlinear optical coefficient have been derived and their corresponding second harmonic efficiency factors are calculated. [ABSTRACT FROM AUTHOR]