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170 条记录 (耗时 0.03 秒)

    Double-clad optical fiber with improved inner cladding geometry
    22.
    发明授权
    Double-clad optical fiber with improved inner cladding geometry 失效
    双包层光纤具有改进的内包层几何形状

    公开(公告)号：US6157763A

    公开(公告)日：2000-12-05

    申请号：US050386

    申请日：1998-03-30

    申请人： Stephen G. Grubb ,  David F. Welch

    发明人： Stephen G. Grubb ,  David F. Welch

    IPC分类号： G02B6/036 ,  H01S3/067 ,  G02B6/22

    CPC分类号： G02B6/03622 ,  H01S3/06708 ,  H01S3/06729

    摘要： A double-clad optical fiber has an inner cladding with a cross-sectional shape that is non-circular, but that maintains a good end-coupling profile. The cross-sectional shape of the inner cladding is such that two perpendicular distances across the shape, each of which passes through a geometric center of a core of the fiber, are equal for all angular positions. Thus, while mode mixing within the inner cladding is enhanced, the inner cladding does not suffer any oblong distortions of its shape, and is therefore more easily coupled to conventional fibers. The cross-sectional cladding shape may include various regions along its outer surface that do not conform to a circular geometry about a center of the core. These regions may include flat regions, or concave or convex regions. The overall cross-sectional shape of the inner cladding may also be octagonal or star-shaped. In an alternative embodiment of the invention, the inner cladding may have a circular cross section, but has a torsional stress induced within it during manufacture. By rotating the fiber preform prior to curing of the inner cladding layer, a physical stress may be permanently imparted to the inner cladding which interacts with pump energy within the inner cladding layer to encourage mode mixing.

    摘要翻译： 双包层光纤具有内包层，其截面形状为非圆形，但是保持良好的端耦合曲线。 内包层的横截面形状使得跨越形状的两个垂直距离通过纤维的芯的几何中心，对于所有角度位置是相等的。 因此，当在内包层内的模式混合被增强时，内包层不会遭受其形状的任何长方形变形，因此更容易地耦合到常规的纤维。 横截面包层形状可以包括沿着其外表面的不符合围绕芯的中心的圆形几何形状的各种区域。 这些区域可以包括平坦区域或凹或凸区域。 内包层的整个横截面形状也可以是八边形或星形。 在本发明的替代实施例中，内包层可以具有圆形横截面，但在制造期间具有在其内引起的扭转应力。 通过在内包层固化之前旋转纤维预制件，物理应力可以永久地施加到与包层内的泵浦能量相互作用的内包层，以促进模式混合。

    Semiconductor optical amplifying media with reduced self-focusing
    26.
    发明授权
    Semiconductor optical amplifying media with reduced self-focusing 失效
    具有减少自聚焦的半导体光放大介质

    公开(公告)号：US5657157A

    公开(公告)日：1997-08-12

    申请号：US494255

    申请日：1995-06-23

    申请人： Robert J. Lang ,  Julian S. Osinski ,  David F. Welch

    发明人： Robert J. Lang ,  Julian S. Osinski ,  David F. Welch

    IPC分类号： H01S5/06 ,  H01S5/10 ,  H01S5/20 ,  H01S5/50 ,  H01S3/00

    CPC分类号： H01S5/10 ,  H01S5/20 ,  H01S5/50 ,  H01S5/0618 ,  H01S5/1057

    摘要： A semiconductor light amplifying medium has reduced self-focusing and optical filamentation for providing higher power coherent outputs in broad-area laser and amplifier devices. In one embodiment, a longitudinally inhomogeneous active region has alternating segments of first gain portions and second compensating portions. The compensating portions have a negative self-focusing parameter [.differential.n/.differential.P] and may be light absorbing (negative gain) regions with negative antiguiding factor .alpha. or light amplifying (positive gain) regions with positive antiguiding factor .alpha.. The .alpha.-parameter is defined as the ratio of refractive index change per change in gain, as a function of carrier density. In a second embodiment, the medium may have longitudinally varying peak filament period so that filaments beginning to form in one portion of the active region are subsequently dispersed in a succeeding portion, slowing filament growth. In addition to self-focusing compensation, media with a lower .alpha.-parameter are provided by increasing the barrier height in quantum well active regions, straining or p-doping the active region, or a combination of these methods.

    摘要翻译： 半导体光放大介质具有减少的自聚焦和光纤光栅，用于在广域激光和放大器装置中提供更高功率的相干输出。 在一个实施例中，纵向不均匀有源区具有第一增益部分和第二补偿部分的交替段。 补偿部分具有负自聚焦参数[差分n /差分P]，并且可以是具有正抗抗原因子α的负抗原因子α或光放大（正增益）区域的吸光（负增益）区域。 α参数定义为每增益变化的折射率变化率，作为载流子密度的函数。 在第二实施例中，介质可以具有纵向变化的峰值丝线周期，使得在有源区域的一部分中开始形成的长丝随后分散在随后的部分中，从而减慢长丝生长。 除了自聚焦补偿之外，通过增加量子阱活性区域中的势垒高度，对活性区域进行应变或p掺杂或者这些方法的组合来提供具有较低α参数的介质。

    Frequency converted laser diode and lens system therefor
    29.
    再颁专利
    Frequency converted laser diode and lens system therefor 失效
    变频激光二极管及其透镜系统

    公开(公告)号：USRE35215E

    公开(公告)日：1996-04-23

    申请号：US307174

    申请日：1994-09-16

    申请人： Robert G. Waarts ,  David F. Welch ,  Donald R. Scifres ,  Robert J. Lang ,  Derek W. Nam

    发明人： Robert G. Waarts ,  David F. Welch ,  Donald R. Scifres ,  Robert J. Lang ,  Derek W. Nam

    IPC分类号： G02F1/37 ,  H01S3/00 ,  H01S5/00 ,  H01S5/026 ,  H01S5/0625 ,  H01S5/10 ,  H01S5/12 ,  H01S5/14 ,  H01S5/187 ,  H01S5/40 ,  H01S5/50 ,  H01S3/08 ,  H01S3/10

    CPC分类号： H01S5/50 ,  G02F1/37 ,  H01S5/0265 ,  H01S5/005 ,  H01S5/0092 ,  H01S5/026 ,  H01S5/06256 ,  H01S5/1064 ,  H01S5/1215 ,  H01S5/141 ,  H01S5/187 ,  H01S5/4025 ,  H01S5/4031 ,  H01S5/4068 ,  H01S5/4087

    摘要： A compact semiconductor laser light source providing short wavelength (ultraviolet, blue or green) coherent light by means of frequency doubling of red or infrared light from a high power diode heterostructure. The high power diode heterostructure is a MOPA device having a single mode laser oscillator followed by a multimode, preferably flared, optical power amplifier. A tunable configuration having an external rear reflector grating could also be used. A lens could be integrated with the MOPA to laterally collimate the light before it is emitted. Straight or curved, surface emitting gratings could also be incorporated. An astigmatism-correcting lens system having at least one cylindrical lens surface is disposed in the path of the output from the MOPA to provide a beam with substantially equal lateral and transverse beam width dimensions and beam divergence angles. A nonlinear optical crystal or waveguide is placed in the path of the astigmatism-free symmetrized beam to double the frequency of the light. Single pass or multipass configurations with reflectors could be used, as well as external resonator and segmented, periodically poled waveguide configurations.

    摘要翻译： 一种紧凑的半导体激光光源，通过从高功率二极管异质结构的红色或红外光的倍频提供短波长（紫外线，蓝色或绿色）相干光。 高功率二极管异质结构是具有单模激光振荡器的MOPA器件，其后是多模，优选为扩展的光功率放大器。 也可以使用具有外部后反射器光栅的可调构造。 透镜可以与MOPA集成，以在发射光之前对光进行横向准直。 还可以结合直的或弯曲的表面发射光栅。 具有至少一个柱面透镜表面的散光校正透镜系统设置在来自MOPA的输出的路径中，以提供具有基本相等的横向和横向波束宽度尺寸和光束发散角的光束。 将非线性光学晶体或波导放置在无散光对称光束的路径中，将光的频率加倍。 可以使用具有反射器的单通或多通道配置，以及外部谐振器和分段的周期性极化波导配置。

    Method and apparatus for detecting the presence and location of an object in a field
    30.
    发明授权
    Method and apparatus for detecting the presence and location of an object in a field 失效
    用于检测场中物体的存在和位置的方法和装置

    公开(公告)号：US5493112A

    公开(公告)日：1996-02-20

    申请号：US487409

    申请日：1995-06-07

    申请人： David F. Welch

    发明人： David F. Welch

    IPC分类号： F41J5/02 ,  G01S17/00 ,  G01S17/89 ,  G01V8/18 ,  G01V8/26 ,  H01J40/14

    CPC分类号： G01V8/26 ,  F41J5/02 ,  G01S17/00 ,  G01S17/89 ,  G01V8/18

    摘要： An optical system and method for detecting the presence and location of at least one stationary or moving object in a field. The optical system has at least one light source to generate a beam, which beam is scanned by at least one first reflecting surface to generate a plurality of beams. The beams are overlapped across the field by at least one second reflecting surface and their intensity is measured by at least one detection means.

    摘要翻译： 一种用于检测场中至少一个静止或移动物体的存在和位置的光学系统和方法。 光学系统具有至少一个光源以产生光束，该光束被至少一个第一反射表面扫描以产生多个光束。 光束通过至少一个第二反射表面在场上重叠，并且它们的强度由至少一个检测装置测量。