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    Differentially pumped optical amplifer and mopa device
    14.
    发明授权
    Differentially pumped optical amplifer and mopa device 失效
    差分泵浦光学放大器和mopa器件

    公开(公告)号：US5539571A

    公开(公告)日：1996-07-23

    申请号：US202359

    申请日：1994-02-28

    申请人： David F. Welch ,  Donald R. Scifres ,  Robert G. Waarts ,  David G. Mehuys ,  Amos A. Hardy ,  Ross A. Parke

    发明人： David F. Welch ,  Donald R. Scifres ,  Robert G. Waarts ,  David G. Mehuys ,  Amos A. Hardy ,  Ross A. Parke

    IPC分类号： H01S5/026 ,  H01S5/042 ,  H01S5/062 ,  H01S5/10 ,  H01S5/12 ,  H01S5/125 ,  H01S5/16 ,  H01S5/187 ,  H01S5/20 ,  H01S5/50 ,  H01S3/00

    CPC分类号： H01S5/0425 ,  H01S5/026 ,  H01S5/20 ,  H01S5/50 ,  H01S2301/163 ,  H01S2301/166 ,  H01S5/0267 ,  H01S5/0422 ,  H01S5/06243 ,  H01S5/1014 ,  H01S5/1053 ,  H01S5/1064 ,  H01S5/1085 ,  H01S5/12 ,  H01S5/125 ,  H01S5/16 ,  H01S5/187 ,  H01S5/2036 ,  H01S5/5018

    摘要： An optical amplifier semiconductor device which is differentially pumped and a master oscillator power amplifier (MOPA) device employing such an amplifier. The amplifier allows the light propagating therein to diverge along at least part of its length, and may be a flared amplifier having a gain region that increases in width toward its output at a rate that equals or exceeds the divergence of the light. The amplifier is pumped with a current density at its input end which is smaller than the current density used to pump the output end for maintaining coherence of the beam to high power levels. Differential pumping may be both longitudinal and lateral within the amplifier. A single mode preamplifier section may be optically coupled to the input end of the amplifier. The amplifier input may have a width which is the same as or wider than that of the preamplifier output. The preamplifier may have a constant mode width or may be tapered to alter the divergence of the beams provided to the amplifier section. The laser oscillator in the MOPA device may be a single mode DBR laser diode monolithically integrated on the same substrate as the optical amplifier. Laser sources external to an amplifier chip may also be used. The input portion of the amplifier or the preamplifier section, if present, may be modulated. The laser oscillator might also be modulated if it has a high Q cavity. Tunable laser oscillators are also disclosed.

    摘要翻译： 差分泵浦的光放大器半导体器件和采用这种放大器的主振荡器功率放大器（MOPA）器件。 放大器允许其中传播的光沿其长度的至少一部分发散，并且可以是具有增益区域的扩张放大器，该增益区域以等于或超过光的发散度的速率朝向其输出增加。 放大器在其输入端以电流密度泵送，该电流密度小于用于泵浦输出端的电流密度，以将光束的相干性保持在高功率水平。 差分泵浦可以在放大器内部纵向和横向两者。 单模前置放大器部分可以光耦合到放大器的输入端。 放大器输入可以具有与前置放大器输出的宽度相同或更宽的宽度。 前置放大器可以具有恒定的模式宽度，或者可以是锥形的，以改变提供给放大器部分的光束的发散度。 MOPA器件中的激光振荡器可以是单模DBR激光二极管，其单片集成在与光放大器相同的衬底上。 还可以使用放大器芯片外部的激光源。 放大器或前置放大器部分的输入部分（如果存在）可以被调制。 如果激光振荡器具有高Q腔，则也可能会被调制。 还公开了可调谐激光振荡器。

    Broad-area MOPA device with leaky waveguide beam expander
    15.
    发明授权
    Broad-area MOPA device with leaky waveguide beam expander 失效
    具有泄漏波导束扩展器的广域MOPA器件

    公开(公告)号：US5349602A

    公开(公告)日：1994-09-20

    申请号：US31684

    申请日：1993-03-15

    申请人： David G. Mehuys ,  Stephen O'Brien ,  David F. Welch

    发明人： David G. Mehuys ,  Stephen O'Brien ,  David F. Welch

    IPC分类号： G02B6/12 ,  G02B6/125 ,  G02B6/30 ,  H01S3/00 ,  H01S5/00 ,  H01S5/026 ,  H01S5/10 ,  H01S5/12 ,  H01S5/125 ,  H01S5/187 ,  H01S5/50 ,  H01S3/08

    CPC分类号： H01S5/026 ,  G02B6/12004 ,  G02B6/125 ,  G02B6/305 ,  H01S5/10 ,  H01S3/005 ,  H01S5/005 ,  H01S5/0264 ,  H01S5/1021 ,  H01S5/1215 ,  H01S5/125 ,  H01S5/187 ,  H01S5/50

    摘要： A coherent light source, such as a laser oscillator and a monolithic MOPA device, and a broad area light amplifying device, all characterized by having a leaky waveguide beam expander coupled thereto for expanding a single mode beam into a wide light beam in a coherent manner. The beam expander comprises an elongated antiguide core of a first refractive index and a radiated-wave receiving region of a higher refractive index to receive lightwaves laterally radiated from the antiguide core. This beam expander can be located at an output end of a single mode laser oscillator to receive and expand the beam, at an input end of a broad area optical power amplifier to allow the amplifier to accept a narrow input beam, or between the laser oscillator and power amplifier in a MOPA device. The beam expander elements can also be located partially or entirely within the resonant optical cavity of a laser oscillator.

    摘要翻译： 相干光源，例如激光振荡器和单片MOPA器件，以及广域光放大器件，其特征在于具有耦合到其上的泄漏波导束扩展器，用于以一致的方式将单模光束扩展成宽光束 。 光束扩展器包括具有第一折射率的细长防反射芯和较高折射率的辐射波接收区，用于接收从抗磁核心横向辐射的光波。 该光束扩展器可以位于单模激光振荡器的输出端，以在广域光功率放大器的输入端处接收和扩展光束，以允许放大器接受窄输入光束，或激光振荡器 和功率放大器在MOPA设备。 光束扩展器元件也可以部分地或完全地位于激光振荡器的谐振光学腔内。

    Antiguided semiconductor laser array with edge reflectors
    16.
    发明授权
    Antiguided semiconductor laser array with edge reflectors 失效
    具有边缘反射器的反射半导体激光器阵列

    公开(公告)号：US5159604A

    公开(公告)日：1992-10-27

    申请号：US737463

    申请日：1991-07-29

    申请人： David G. Mehuys ,  Amos A. Hardy ,  David F. Welch ,  Robert G. Waarts ,  Donald R. Scifres

    发明人： David G. Mehuys ,  Amos A. Hardy ,  David F. Welch ,  Robert G. Waarts ,  Donald R. Scifres

    IPC分类号： H01S5/40

    CPC分类号： H01S5/4031

    摘要： In a semiconductor laser array structure in which antiguided regions between high effective refractive index waveguide regions experience greater gain then the waveguide regions, structures introduced at the sides of the array, next to the edgemost waveguides and not on the array period, reflect laterally transmitted radiation back toward the center of the array. The edge reflecting structures may be waveguide regions having widths of (m'+1/2) half-wavelengths, where "m'" is zero or a positive integer, compared to array waveguides with width m, where "m" is an integer not necessarily equal to "m'". The edge reflecting structures may also be stacks of such waveguides, where the regions between the edge waveguides are of a width substantially equal to (n'+1/2) half-wavelengths, compared to antiguide element widths of n half-wavelengths. The two integers n and n' may be, but are not necessarily, equal. Alternatively, the edge reflectors can be mirrors fabricated at the side edges of the array or by disordering the active region beyond the edgemost waveguides to form a refractive index step. The mirrors should be positioned a distance substantially a/2 from the edgemost emitters, where "a" is the array period.

    摘要翻译： 在半导体激光器阵列结构中，其中高有效折射率波导区域之间的防护区域具有更大的增益，然后波导区域，引导在阵列侧面的结构，在边缘波导旁边，而不是阵列周期，反射横向透射辐射 回到阵列的中心。 与具有宽度m的阵列波导相比，边缘反射结构可以是宽度为（m'+ 1/2）半波长的波导区域，其中“m”为零或正整数，其中“m”为整数 不一定等于“m”。 边缘反射结构也可以是这样的波导的堆叠，其中边缘波导之间的区域的宽度基本上等于（n'+ 1/2）个半波长，与n个半波长的防卫元件宽度相比。 两个整数n和n'可以是但并不一定相等。 或者，边缘反射器可以是在阵列的侧边缘处制造的反射镜，或者通过使有源区域超出边缘波导的方式来形成折射率步骤。 镜子应该与edgemost发射器的距离基本上为1/2，其中“a”是阵列周期。

    Integrated laser-amplifier with steerable beam
    17.
    发明授权
    Integrated laser-amplifier with steerable beam 失效
    具有可转向光束的集成式激光放大器

    公开(公告)号：US5003550A

    公开(公告)日：1991-03-26

    申请号：US494620

    申请日：1990-03-09

    申请人： David F. Welch ,  Robert G. Waarts ,  David G. Mehuys ,  Richard R. Craig

    发明人： David F. Welch ,  Robert G. Waarts ,  David G. Mehuys ,  Richard R. Craig

    IPC分类号： H01S5/026 ,  H01S5/062 ,  H01S5/0625 ,  H01S5/10 ,  H01S5/125 ,  H01S5/187 ,  H01S5/40 ,  H01S5/42 ,  H01S5/50

    CPC分类号： H01S5/42 ,  H01S5/50 ,  H01S5/026 ,  H01S5/06243 ,  H01S5/06256 ,  H01S5/1064 ,  H01S5/125 ,  H01S5/187 ,  H01S5/4068 ,  H01S5/4075

    摘要： A monolithic integrated master oscillator power amplifier (MOPA) device including a single mode diode laser with distributed Bragg reflectors, an amplifier in tandem with the laser, lateral phase controllers and a detuned second order grating surface output coupler, all on a common substrate. The amplifier is a flared waveguide in one embodiment, and a branching network of single mode waveguides followed by an array of single mode gain waveguides in another embodiment. The diode laser is tunable by means of a separate tuning current applied to the rear Bragg reflector. Tuning the laser wavelength provides, in conjunction with the output coupler, a longitudinal steering of the output beam. The lateral phase controllers are an array of separately addressable electrodes that adjust the optical path length to compensate for phase variation in the amplifiers and also to provide lateral steering of the output beam. An additional embodiment includes a chain of amplifiers and grating output couplers for providing multiple output beams.

    摘要翻译： 单片集成主振荡器功率放大器（MOPA）器件，包括具有分布式布拉格反射器的单模二极管激光器，与激光器串联的放大器，横向相位控制器和失谐的二阶光栅表面输出耦合器，均在公共衬底上。 在一个实施例中，放大器是扩口波导，在另一实施例中是单模波导的分支网络，之后是单模增益波导阵列。 二极管激光器可以通过施加到后布拉格反射器的单独的调谐电流来调节。 调谐激光波长与输出耦合器一起提供输出光束的纵向转向。 横向相位控制器是单独可寻址电极的阵列，其调节光路长度以补偿放大器中的相位变化，并且还提供输出光束的横向转向。 附加实施例包括用于提供多个输出光束的放大器链和光栅输出耦合器链。

    Semiconductor laser with integral spatial mode filter
    18.
    再颁专利
    Semiconductor laser with integral spatial mode filter 有权
    具有积分空间模式滤波器的半导体激光器

    公开(公告)号：USRE37354E1

    公开(公告)日：2001-09-04

    申请号：US09418905

    申请日：1999-10-15

    申请人： David F. Welch ,  David G. Mehuys ,  Donald R. Scifres

    发明人： David F. Welch ,  David G. Mehuys ,  Donald R. Scifres

    IPC分类号： H01S319

    CPC分类号： H01S5/1014 ,  G02B6/12004 ,  G02B6/305 ,  H01S3/0818 ,  H01S3/113 ,  H01S5/026 ,  H01S5/0286 ,  H01S5/0425 ,  H01S5/0625 ,  H01S5/06256 ,  H01S5/065 ,  H01S5/0655 ,  H01S5/10 ,  H01S5/1003 ,  H01S5/1064 ,  H01S5/1082 ,  H01S5/1085 ,  H01S5/1215 ,  H01S5/125 ,  H01S5/14 ,  H01S5/141 ,  H01S5/146 ,  H01S5/18 ,  H01S5/187 ,  H01S5/20 ,  H01S5/2036 ,  H01S5/2063 ,  H01S5/4025 ,  H01S5/4062 ,  H01S5/4087 ,  H01S5/50 ,  H01S2301/166

    摘要： A semiconductor laser having a light amplifying diode heterostructure with a flared gain region in an external resonant cavity. The flared gain region has a narrow aperture end which may be coupled to a single mode waveguide and a wide output end. A light emitting surface of the heterostructure proximate to the wide end of the flared gain region is partially reflective and combines with an external reflector to form a resonant cavity that is effectively unstable. The intracavity light-emitting surface proximate to the narrow aperture end is antireflection coated. The external reflector may be a planar mirror or a grating reflector. A lens or an optical fiber may couple the aperture end of the flared gain region to the external reflector. Frequency-selective feedback is provided by orienting the grating reflector or providing a prism in the cavity in front of the external planar mirror. Other filtering elements may also be placed in the external cavity. The flared gain region and waveguide may be differentially pumped or modulated with current provided by separate contacts.

    摘要翻译： 一种具有在外部谐振腔中具有扩张增益区的光放大二极管异质结构的半导体激光器。 扩口增益区域具有窄孔径端，其可以耦合到单模波导和宽输出端。 接近扩张增益区域的宽端的异质结构的发光表面是部分反射的，并且与外部反射器组合以形成有效不稳定的谐振腔。 靠近窄孔径的腔内发光表面是抗反射涂层的。 外部反射器可以是平面镜或光栅反射器。 透镜或光纤可将扩张增益区域的孔径端耦合到外部反射器。 通过定向光栅反射器或在外部平面镜的前面的空腔中提供棱镜来提供频率选择反馈。 其它过滤元件也可以放置在外部空腔中。 扩张增益区域和波导可以通过由单独的触点提供的电流进行差分泵浦或调制。