公开(公告)号：US06804272B2

公开(公告)日：2004-10-12

申请号：US10257680

申请日：2003-03-14

申请人： James Christopher O'Gorman ,  Paul McEvoy ,  Stephen Anthony Lynch ,  Pascal Michel Landais

发明人： James Christopher O'Gorman ,  Paul McEvoy ,  Stephen Anthony Lynch ,  Pascal Michel Landais

IPC分类号： H01S313

CPC分类号： H01S5/223 ,  H01S5/0658 ,  H01S5/20 ,  H01S5/204 ,  H01S5/2205 ,  H01S5/2231

摘要： A semiconductor self-pulsating laser diode (1) comprises a wave guiding layer (2) sandwiched between lower and upper cladding layers (4, 5). A current blocking layer (8) defining a slot (10) through which pumping current is directed through the laser diode between upper and lower contact plates (5, 6) defines an active wave guiding region (15). The current blocking layer (8) is shaped by the formation of longitudinally extending recesses (12) for defining the active wave guiding region (15) such that a central pulse light generating region (17) is formed surrounded by an outer light propagating region (18). As the laser diode is continuously pumped, an effective step change in refractive index between the wave guiding layer (2) and the outer light propagating region (18) is formed, and the carrier density and refractive index profiles across the active wave guiding region (15) vary as each light pulse cycle progresses. Initially, the carrier density in the central pulse light generating region 17 rises relative to the carrier density in the light propagating region 18 until the difference between the refractive index of the pulse light generating region 17 and the refractive index of the light propagating region 18 is at its greatest, and the carrier density of the pulse light generating region 17 reaches its lasing threshold value. At this stage lasing commences in the active wave guiding region 15. Lasing in the pulse light generating region 17 progressively reduces the carrier density therein, which in turn progressively reduces the relative difference between the refractive index of the pulse light generating region 17 and the light propagating region 18 until the refractive index of the pulse light generating region 17 approaches the refractive index of the light propagating region 18, thereby increasing guiding of lasing light into the pulse light generating region 17 for emission of the light pulse therefrom. At that stage the carrier density of the active wave guiding region 15 falls below its lasing threshold value, thus extinguishing the lasing light, and the next light pulse cycle commences.

公开(公告)号：US06978057B1

公开(公告)日：2005-12-20

申请号：US10088758

申请日：2000-09-25

申请人： James Christopher O'Gorman ,  Paul McEvoy ,  David McDonald ,  Frederick Paul Logue ,  Pascal Michel Landais

发明人： James Christopher O'Gorman ,  Paul McEvoy ,  David McDonald ,  Frederick Paul Logue ,  Pascal Michel Landais

IPC分类号： G02B6/00 ,  G02B6/10 ,  G02F1/00 ,  H01S5/10 ,  H01S5/40

CPC分类号： H01S5/4031 ,  H01S5/0654 ,  H01S5/10 ,  H01S5/1017 ,  H01S5/4087

摘要： A laser diode (1) having an optical path (15) defined in an active layer (2) which is sandwiched between a substrate layer (3) and a top layer (4) and defined by a ridge (14) formed in the top layer (4) outputs laser light of a single predetermined wavelength. Refractive index altering grooves (21) extending transversely in the top layer (4) are provided at spaced apart locations for altering the refractive index of the active layer (2) along the optical path at partial reflecting locations (20) for causing partial longitudinal reflections of the laser light generated in the optical path (15) so that standing waves or harmonics thereof of the single predetermined wavelength are set up between the respective partial reflecting locations (20) and a first mirror facet (8) in the optical path (15). In order that the standing waves set up between the partial reflecting locations (20) and the first mirror facet (8) are harmonics of the predetermined single wavelength, the refractive index altering grooves (21) are located along the ridge (14) for forming the reflecting locations (20) at distances from the first mirror facet (8) which correspond to the effective length of the optical path (15) resulting from the affect of the inclusion of the reflecting locations (20) rather than at locations corresponding to the actual length of the light path (15).

摘要翻译： 一种激光二极管（1），其具有限定在有源层（2）中的光路（15），该有源层（2）夹在基板层（3）和顶层（4）之间，并由形成在顶部 层（4）输出单个预定波长的激光。 在间隔开的位置处提供横向延伸在顶层（4）中的折射率改变槽（21），用于在部分反射位置（20）处沿着光路改变有源层（2）的折射率，以使局部纵向反射 在所述光路（15）中产生的激光的每个部分反射位置（20）和所述光路（15）中的第一镜面（8）之间建立其单个预定波长的驻波或谐波 ）。 为了在部分反射位置（20）和第一镜面（8）之间建立的驻波是预定单波长的谐波，折射率改变槽（21）沿着脊（14）定位成形 距离第一镜面（8）的距离对应于由包含反射位置（20）的影响而导致的光路（15）的有效长度的反射位置（20），而不是对应于 光路的实际长度（15）。