Advance in field poling of QPM

When QPM devices for frequency conversion was invented, the poling was processed by means of proton-exchange an thickness of QPM devices was limited with the order of micro-meters. Therefore, QPM technology was able to be applicable for only waveguide type devices. Invention of the field poling technoque is the starting point of both QPM power devices and micro-domain stractural control.

However, field poling process was still limited by the coercive field in QPM host materials. Our group discovered that this coercivefield depends on its temperare, and demonstrated thick QPM device during the field poling under controlled temperature. This "temperature-elevated field poling" and the high power output from QPM devices with large aperture opened the door to giant-microphotonics.

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