CAJ | 학술논문

通过控制平台移动速度来控制紫外曝光量和2次曝光的方法实现任意变迹光纤布拉格光栅的制备.该方法采用连续氩离子激光作为紫外光源,不需要光强掩模板,通过对移动平台速度的编程控制可以获得任意的光栅结构参数,如长度、变迹包络、平均折射率改变量等.在2次曝光过程中,由于对2次紫外曝光量的精确控制,整个光栅的总平均折射率变化保持不变,从而避免了由此引起的啁啾而可以获得无旁瓣窄带宽的反射光栅.采用该方法制备了一根2 cm长的高斯变迹光栅,其反射带宽达到了0.15 nm,反射率约为95%.
통과공제평태이동속도래공제자외폭광량화2차폭광적방법실현임의변적광섬포랍격광책적제비.해방법채용련속아리자격광작위자외광원,불수요광강엄모판,통과대이동평태속도적편정공제가이획득임의적광책결구삼수,여장도、변적포락、평균절사솔개변량등.재2차폭광과정중,유우대2차자외폭광량적정학공제,정개광책적총평균절사솔변화보지불변,종이피면료유차인기적조추이가이획득무방판착대관적반사광책.채용해방법제비료일근2 cm장적고사변적광책,기반사대관체도료0.15 nm,반사솔약위95%.
A double-exposure fabrication method without any intensity shadow mask to fabricate arbitrarily apodized fiber Bragg gratings(FBGs)with narrow bandwidth is demonstrated by controlling the total ultra violet(UV)irradiation along the graung by varymg the speed of a translation stage.The UV source used is a stable continuous intracavity frequency-doubled argon-ion laser.The parameters(such as length,apodization profle,average index change)of FBGs Can be easily changed with this method.The total UV irradiation is kept constant in the double-exposure process because of the precise control of the exposure time,which ensures that the apodized FBG'S bandwidth can be extremely narrow.Thhe full width at half maximum(FWHM)bandwidth of the 2-cm.long apodized FBG fabricated by this method is 0.15 nm with a maxilnuln reflectivity of more than 95%.