光电工程
光電工程
광전공정
OPTO-ELECTRONIC ENGINEERING
2008年
3期
77-83
,共7页
占生宝%赵尚弘%余侃民%胥杰%楚兴春%吴卓亮%王蜀一
佔生寶%趙尚弘%餘侃民%胥傑%楚興春%吳卓亮%王蜀一
점생보%조상홍%여간민%서걸%초흥춘%오탁량%왕촉일
反射体光栅%光栅参数%布拉格衍射%衍射效率%频谱组束
反射體光柵%光柵參數%佈拉格衍射%衍射效率%頻譜組束
반사체광책%광책삼수%포랍격연사%연사효솔%빈보조속
reflecting volume Bragg grating%grating parameter%Bragg diffraction%diffraction efficiency%spectral beam combining
基于耦合波理论,提出了一种推导反射体布拉格光栅衍射效率方程的新方法.在被推导的衍射效率方程基础上,获得了平面单色和高斯光束反射体布拉格光栅衍射的详细理论模型,分析了平面单色、发散单色和多色光束的衍射效率.结果表明:平面单色波的角和谱选择性随光栅厚度和空间频率而变化,角选择性的范围从低于0.01mrad到超过100mrad,谱选择性的范围从低于0.1nm到超过100nm;当光束的角发散或谱宽等于光栅的角选择或谱选择性时,光栅能提供超过88%的衍射效率;当光束的角发散或谱宽远小于光栅的角选择或谱选择性时,光栅衍射效率下降不明显,不到平面单色波的1%.
基于耦閤波理論,提齣瞭一種推導反射體佈拉格光柵衍射效率方程的新方法.在被推導的衍射效率方程基礎上,穫得瞭平麵單色和高斯光束反射體佈拉格光柵衍射的詳細理論模型,分析瞭平麵單色、髮散單色和多色光束的衍射效率.結果錶明:平麵單色波的角和譜選擇性隨光柵厚度和空間頻率而變化,角選擇性的範圍從低于0.01mrad到超過100mrad,譜選擇性的範圍從低于0.1nm到超過100nm;噹光束的角髮散或譜寬等于光柵的角選擇或譜選擇性時,光柵能提供超過88%的衍射效率;噹光束的角髮散或譜寬遠小于光柵的角選擇或譜選擇性時,光柵衍射效率下降不明顯,不到平麵單色波的1%.
기우우합파이론,제출료일충추도반사체포랍격광책연사효솔방정적신방법.재피추도적연사효솔방정기출상,획득료평면단색화고사광속반사체포랍격광책연사적상세이론모형,분석료평면단색、발산단색화다색광속적연사효솔.결과표명:평면단색파적각화보선택성수광책후도화공간빈솔이변화,각선택성적범위종저우0.01mrad도초과100mrad,보선택성적범위종저우0.1nm도초과100nm;당광속적각발산혹보관등우광책적각선택혹보선택성시,광책능제공초과88%적연사효솔;당광속적각발산혹보관원소우광책적각선택혹보선택성시,광책연사효솔하강불명현,불도평면단색파적1%.
Based on coupled-wave theory,a new approach of deriving diffraction efficiency equation on reflecting volume Bragg gratings Was proposed,On the basis of the deriVed equation,the detailed theoretical modeling for diffraction of plane and Gaussian beams on reflecting volume Bragg gratings were obtained,and the diffraction efficiencies including plane monochromatic,divergent monochromatic,and polychromatic beams were analyzed.Numerical results show that the angular selectivity could be varied from more than 100 mrad to less than 0.01 mrad.and spectral selectivity could also be varied from more than 100 am to less than 0.1 nm.When angular divergence or spectral width equals the angular or spectral selectivity,the grating Can provide maximal diffraction efficiency of more than 88%.When angular divergence or spectral width is far less than the angular or spectral selectivity,the decrease of diffraction efficiency is insignificant,which is less.than 1% of plane monochromatic wave.