ANALYSIS OF SIMULTANEOUS Q-SWITCHING AND FREQUENCY-DOUBLING IN KTP

Simultaneous Q-switching and second harmonic generation in KTP is anal ysed numerically. In this mode of operation, the phase matching condit ion for second harmonic generation and the half-wave voltage for Q-swi tching are interrelated. In this paper, this coupled numerical problem is solved iteratively until a self-consistent solution is obtained. T he effective refractive index and effective electro-optical coefficien t along the phase matching direction are defined and calculated in ord er to estimate the half-wave voltage for Q-switching with KTP. Additio nally, the application of temperature and wavelength dispersion tuning to compensate for the constant retardation in this biaxial crystal is also studied. It is found that the operating temperature of the KTP c rystal should be stable to within 0.1 degrees C for exact retardation compensation.