Abstract

We demonstrate the use of an engineered aperiodically poled (APP) crystal grating to generate a high-efficiency second-harmonic radiation of about 66% at 50 W of fundamental power at room temperature. By embedding several phase compensators along the propagation direction, it is shown that such structure is capable of compensating thermal de-phasing and Gouy phase shift without the need for a controllable oven for the crystal. Compared to a temperature-optimized conventional PP crystal, an APP device can produce second-harmonic generation light by a factor of about two times. Moreover, a multipath structure of an APP is theoretically investigated to decrease the sensitivity of the device to the pumping power variation. Eventually, the acceptance bandwidth of an APP scheme is found to be enhanced by 3.3°C and 0.5°C compared with temperature-optimized PP crystal.

© 2016 Optical Society of America

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