公开(公告)号：EP2006965A2

公开(公告)日：2008-12-24

申请号：EP07736997.3

申请日：2007-03-30

申请人： Kyoto University ,  Rohm Co., Ltd.

发明人： NODA, Susumu ,  KUROSAKA, Yoshitaka ,  MIYAI, Eiji ,  OHNISHI, Dai ,  KUNISHI, Wataru

IPC分类号： H01S5/18

CPC分类号： H01S5/183 ,  H01S5/105

摘要： A two-dimensional photonic crystal surface emitting laser light source according to the present invention includes a two-dimensional photonic crystal made of a plate-shaped body material provided with a periodic arrangement of identically-shaped holes 242A and an active layer provided on one side of the two-dimensional photonic crystal. The hole 242A is not located on a first half-line 251 extending from the gravity center G1 of the hole in a direction within the plane of the two-dimensional photonic crystal, while the hole 242A is located at least on a portion of a second half-line 252 extending from the gravity center G1 in the direction opposite to the first half-line 251. Injecting electric charges into the active layer generates light, which creates an electric field that encircles the gravity center G1 within the two-dimensional photonic crystal. For a given point on the second half-line 252 at which the hole 242A is located, there is no hole at a point that is symmetrical to the aforementioned point with respect to the gravity center G1, so that there is a difference in the refractive index between the two points. Thus, the electric field vectors at the two points are prevented from canceling each other due to destructive interference, so that the resultant laser light is stronger than conventional examples.

摘要翻译： 根据本发明的二维光子晶体发射激光光源包括由板状主体材料制成的二维光子晶体，该二维光子晶体设置有相同形状的孔242A和设置在一侧的活性层的周期性排列 的二维光子晶体。 孔242A不位于从二维光子晶体的平面内的孔的重心G1延伸的第一半线251上，而孔242A至少位于二次光子晶体的一部分上 从重心G1沿着与第一半线251相反的方向延伸的半线252.向有源层注入电荷产生光，其产生围绕二维光子晶体内的重心G1的电场 。 对于孔242A所在的第二半线252上的给定点，在相对于重心G1与上述点对称的点处没有孔，因此折射率 两点之间的指标。 因此，防止两点处的电场矢量由于相消干涉而彼此抵消，使得所得到的激光比传统示例更强。

公开(公告)号：EP1998420A1

公开(公告)日：2008-12-03

申请号：EP07736925.4

申请日：2007-03-20

申请人： Kyoto University ,  Rohm Co., Ltd.

发明人： SAKAI, Kyosuke ,  MIYAI, Eiji ,  NODA, Susumu ,  OHNISHI, Dai ,  KUNISHI, Wataru

IPC分类号： H01S5/18

CPC分类号： H01S5/18 ,  B82Y20/00 ,  G11B7/127 ,  H01S5/0425 ,  H01S5/105 ,  H01S5/125 ,  H01S5/2027 ,  H01S5/34313 ,  H01S2301/14 ,  H01S2301/18

摘要： An objective of the present invention is to provide a surface emitting laser capable of selectively generating a laser oscillation in the fundamental mode and thereby emitting a single-wavelength laser light. In a surface emitting laser including an active layer and a two-dimensional photonic crystal provided on one side of the active layer, a reflector 45 or 46 is provided at least at a portion of the circumference of the two-dimensional photonic crystal. The reflector has a reflectance distribution in which the reflectance has a maximum value at a position where the amplitude envelope of the fundamental mode of an internal resonance light created within the two-dimensional photonic crystal. This design strengthens the fundamental mode while suppressing the second mode, thus enabling the laser oscillation in the fundamental mode to be selectively obtained, so that a single-wavelength laser light can be emitted.

摘要翻译： 本发明的目的是提供一种能够选择性地在基模中产生激光振荡并由此发射单波长激光的表面发射激光器。 在包括有源层和设置在有源层的一侧上的二维光子晶体的表面发射激光器中，至少在二维光子晶体的圆周的一部分处提供反射器45或46。 反射器具有反射率分布，其中反射率在二维光子晶体内产生的内部共振光的基模的振幅包络的位置具有最大值。 该设计在抑制第二模式的同时强化基本模式，从而能够选择性地获得基模中的激光振荡，从而可以发射单波长激光。

公开(公告)号：EP4131677A1

公开(公告)日：2023-02-08

申请号：EP21781958.0

申请日：2021-03-17

申请人： Kyoto University ,  MITSUBISHI ELECTRIC CORPORATION

发明人： NODA, Susumu ,  DE ZOYSA, Menaka ,  ISHIZAKI, Kenji ,  KUNISHI, Wataru ,  ENOKI, Kentaro

IPC分类号： H01S5/183 ,  H01S5/18

摘要： A two-dimensional photonic-crystal laser 10 includes: a substrate 11 made of an n-type semiconductor; a p-type cladding layer (p-type semiconductor layer) 131 provided on an upper side of the substrate 11 and made of a p-type semiconductor; an active layer 14 provided on an upper side of the p-type cladding layer 131; a two-dimensional photonic-crystal layer 16 provided on an upper side of the active layer 14 and including a plate-shaped base body 161 made of an n-type semiconductor in which modified refractive index areas 162 whose refractive index differs from the base body 161 are periodically arranged; a first tunnel layer 121 provided between the substrate 11 and the p-type cladding layer 131 and made of an n-type semiconductor having a carrier density higher than a carrier density of the substrate 11; a second tunnel layer 122 provided in contact with the first tunnel layer 121 between the first tunnel layer 121 and the p-type cladding layer 131, and made of a p-type semiconductor having a carrier density higher than a carrier density of the p-type semiconductor layer; a first electrode 181 provided on a lower side of the substrate 11 or in the substrate 11; and a second electrode 182 provided on an upper side of the two-dimensional photonic-crystal layer 16.

公开(公告)号：EP1998419A1

公开(公告)日：2008-12-03

申请号：EP07736924.7

申请日：2007-03-20

申请人： Rohm Co., Ltd.

发明人： NODA, Susumu ,  MIYAI, Eiji ,  SAKAI, Kyosuke ,  OHNISHI, Dai ,  KUNISHI, Wataru

IPC分类号： H01S5/18 ,  G02B27/28 ,  G11B7/125

CPC分类号： H01S5/18355 ,  G11B7/127 ,  H01S5/026 ,  H01S5/105

摘要： An objective of the present invention is to provide a laser capable of producing a radially polarized laser beam with an annular cross section. A laser oscillator 60 including an active layer 53 and two-dimensional photonic crystal 55 with circular holes 552 arranged in a square lattice pattern is provided between two electrodes 571 and 572. A first polarization control layer 581, which functions as a half-wave plate, and a second polarization control layer 582, which functions as a half-wave plate with a fast axis 592 extending at an angle of 45° to that of the first polarization control layer 581, are located on the laser oscillator 60. When a voltage is applied between the electrodes, a circumferentially polarized annular laser beam is emitted from the laser oscillator 60. When passing through the first polarization control layer 581 and the second polarization control layer 582, the laser beam is converted to a radially polarized beam. The resultant laser beam can be converged by a focusing lens to achieve a diameter smaller than the diffraction limit. Such a narrow beam is suitable for an optical pickup or many other devices.

摘要翻译： 本发明的目的是提供一种能够产生具有环形横截面的径向偏振激光束的激光器。 在两个电极571和572之间设置包括活性层53和具有以正方形格子图案排列的圆形孔552的二维光子晶体55的激光振荡器60.第一偏振控制层581用作半波片 ，并且作为半波片的第二偏光控制层582位于激光振荡器60上，该半波片具有与第一偏振控制层581成45°的角度延伸的快轴592。 施加在电极之间，从激光振荡器60发射周向极化的环形激光束。当通过第一偏振控制层581和第二偏振控制层582时，将激光束转换成径向偏振光束。 所得到的激光束可以被聚焦透镜会聚，以获得小于衍射极限的直径。 这种窄光束适用于光学拾取器或许多其他装置。