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Mode decoupling in solid state ring laser based on stimulated Raman effect in polar crystals 下载免费PDF全文
In this paper we study the gain saturation induced mode-coupling control in solid state ring laser devices based on the stimulated Raman effect of the polar crystals in order to realize solid state ring laser gyroscopes.We theoretically investigate the mode coupling induced by gain saturation between clockwise (CW) and counterclockwise (CCW) propagating laser modes.Because the CW and CCW running waves are pumped with counter-propagating lasers respectively,the independent coexistence can be ensured. 相似文献
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Group velocity (GV) of eigenmode is a crucial parameter to
explain the extraordinary phenomena about light propagation in
photonic crystals (PhCs). To study relationships between group
velocity and symmetry of PhCs, a new general expression of GV in
PhCs made up of non-dispersive material is introduced. Based on
this, the GVs of eigenmodes of PhCs, especially those of degenerate
eigenmodes at highly symmetric points in the first Brillouin zone,
are discussed. Some interesting results are obtained. For example,
the summation of degenerate eigenmodes' GVs is invariant under the
operations of wave vector ${{\bm K}}$-group $M_{{\bm K}} $. In
addition, some numerical results are presented to verify them. 相似文献
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光子晶体的非严格周期性对其传输特性的影响 总被引:4,自引:4,他引:4
将时域有限差分法(FDTD)用于光子晶体传输特性研究。以二维方格子光子晶体TM模为研究对象。分别讨论了光子晶体制作过程中圆柱半径和品格常量误差对光子晶体传输特性和光子晶体器件性能的影响。研究表明。圆柱半径和品格常量的误差越大。光子晶体的带隙效果越差。在一定的误差范围里,光子晶体的传输特性能够被很好地保持;由于误差的存在,光子晶体点缺陷所形成的微腔的共振频率位置与理想情况发生了漂移;加工精度误差对光子晶体器件性能有较大影响。 相似文献
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