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    • 9. 发明授权
    • Two-dimensional photonic crystal surface emitting laser
    • 二维光子晶体表面发射激光器
    • US08855158B2
    • 2014-10-07
    • US13820436
    • 2011-09-14
    • Yasuhiro NagatomoShoichi Kawashima
    • Yasuhiro NagatomoShoichi Kawashima
    • H01S5/00H01S5/10H01S5/34B82Y20/00H01S5/343H01S5/18H01S5/20
    • H01S5/105B82Y20/00H01S5/18H01S5/187H01S5/2009H01S5/34H01S5/34333H01S2301/185
    • Provided is a two-dimensional photonic crystal surface emitting laser that enables easy laser oscillation with two-dimensionally symmetric intensity distribution, using a photonic crystal of a lattice structure having different lengths of primitive translation vectors in plane, realized in a two-dimensional photonic crystal surface emitting laser including an active layer, and a two-dimensional photonic crystal having a two-dimensionally periodic refractive index profile disposed in a vicinity of the active layer. The two-dimensional photonic crystal has a lattice structure where two primitive translation vectors in plane have different lengths, a shape of a member forming lattice points included in a unit cell of the lattice structure has anisotropy with respect to directions of the two primitive translation vectors, and the anisotropy of the shape of the member permits a difference of a coupling coefficient to be smaller than a case where the shape of the member is isotropic.
    • 提供一种二维光子晶体表面发射激光器,其使用在平面中具有不同长度的原始平移矢量的晶格结构的光子晶体,能够容易地进行具有二维对称强度分布的激光振荡,在二维光子晶体 包括有源层的表面发射激光器和具有设置在有源层附近的具有二维周期性折射率分布的二维光子晶体。 二维光子晶体具有晶格结构,其中平面中的两个原始平移向量具有不同的长度,形成格子结构的单位单元中的晶格点的成员的形状相对于两个原始翻译矢量的方向具有各向异性 ,并且构件的形状的各向异性允许耦合系数的差异小于构件的形状各向同性的情况。
    • 10. 发明授权
    • Surface emitting laser
    • 表面发射激光
    • US08379685B2
    • 2013-02-19
    • US13284069
    • 2011-10-28
    • Shoichi KawashimaYasuhiro Nagatomo
    • Shoichi KawashimaYasuhiro Nagatomo
    • H01S3/098H01S5/00
    • H01S5/105H01S5/125H01S5/18H01S5/32341H01S2301/14H01S2301/166
    • A surface emitting laser emitting a laser beam in a single transverse mode irrespective of an emission area while one-dimensionally aligning polarization of the output beam, including a two-dimensional photonic crystal, having resonance modes in directions of the primitive translation vector a1 and a2, lengths |a1| and |a2| of the primitive translation vectors a1 and a2 satisfied |a1|=p×(λ1/2neff1), |a2|=λ2/2neff2 described by a resonance wavelengths λ1 and λ2 in the resonance modes in the a1 and a2 directions, effective refractive indexes neff1 and neff2 determined by the resonance modes in the a1 and a2 directions, an integer p of 2 or more, the resonance wavelengths λ1 and λ2 satisfy λ2≦2×(neff2/(nout+neff2))×λ1 described by the effective refractive index neff2 and a refractive index nout of an external medium located out of the surface emitting laser.
    • 在与原始平移矢量a1和a2的方向上具有谐振模式的包括二维光子晶体的输出光束的一维排列极化的同时,以单一横向模式发射激光束的表面发射激光器,而不管发射区域 ,长度| a1 | 和| a2 | 在a1和a2方向的共振模式中,通过共振波长λ1和λ2描述的原始转换矢量a1和a2满足| a1 | = p×(λ1/ 2neff1),| a2 | =λ2/ 2neff2,有效折射率 neff1和neff2由a1和a2方向的谐振模式确定,整数p为2或更大,谐振波长λ1和λ2满足λ2≦̸ 2×(neff2 /(nout + neff2))×λ1,由有效折射率 指数neff2和位于表面发射激光器外部的外部介质的折射率nout。