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提出周期极化铌酸锂晶体电控宽带光栅,并利用耦合波理论,推导出电控光栅的衍射光光强分布解析表达式。数值结果表明,该电控光栅的衍射光谱可被外加电场调控。在310 V的外加电压下,1.21~1.83 mm波段的1级光衍射效率达到60%以上,在1.5 mm的1级衍射光衍射效率为70%;而在165 V的外加电压下,0.68~0.92 mm波段的1级光衍射效率达到60%以上,在0.8 mm的1级衍射效率为81%。该电控光栅响应时间短,故有望在高速光开关、波分复用器或调制器方面有重要应用。
An electronically controlled broadband grating with periodically poled lithium niobate crystal is proposed. Based on the coupled wave theory, the analytical expression of the light intensity distribution of the diffracted light of the electronically controlled grating is deduced. The numerical results show that the EDS diffraction spectrum can be controlled by the applied electric field. Under the applied voltage of 310 V, the diffraction efficiency of the first order light in the band of 1.21-1.83 mm reaches more than 60% and the diffraction efficiency of the first order diffracted light of 1.5 mm is 70%; while the applied voltage of 165 V is 0.68-0.92 The first-order diffraction efficiency of the mm band reaches more than 60%, and the first-order diffraction efficiency of 0.8 mm is 81%. The electronic control grating response time is short, it is expected in high-speed optical switches, wavelength division multiplexers or modulators have important applications.