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    • 5. 发明授权
    • Integrated laser-amplifier with steerable beam
    • 具有可转向光束的集成式激光放大器
    • US5003550A
    • 1991-03-26
    • US494620
    • 1990-03-09
    • David F. WelchRobert G. WaartsDavid G. MehuysRichard R. Craig
    • David F. WelchRobert G. WaartsDavid G. MehuysRichard R. Craig
    • H01S5/026H01S5/062H01S5/0625H01S5/10H01S5/125H01S5/187H01S5/40H01S5/42H01S5/50
    • H01S5/42H01S5/50H01S5/026H01S5/06243H01S5/06256H01S5/1064H01S5/125H01S5/187H01S5/4068H01S5/4075
    • 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.
    • 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。
    • 6. 发明授权
    • Spectrally stable laser diode with internal reflector
    • 具有内部反射器的光谱稳定型激光二极管
    • US5185754A
    • 1993-02-09
    • US737194
    • 1991-07-29
    • Richard R. CraigDavid F. WelchErik P. ZuckerDonald R. ScifresWilliam J. Gignac
    • Richard R. CraigDavid F. WelchErik P. ZuckerDonald R. ScifresWilliam J. Gignac
    • H01S5/062H01S5/10H01S5/12H01S5/16
    • H01S5/1021H01S5/06213H01S5/10H01S5/12H01S5/16
    • A laser diode construction having internal reflectors within the laser cavity to provide a stable spectral mode of laser operation. The laser includes a plurality of contiguous semiconductor layers disposed on a substrate to form a semiconductor body with at least one layer forming an active region. Electrically conductive contacts bias the heterostructure to inject current into the active region and produce lightwaves. Feedback means define two or more tandem resonant optical cavities to achieve lasing operation. The feedback means includes at least one internal light reflector within the semiconductor body. In a preferred embodiment, a pair of spaced apart internal reflectors are provided with the region between the pair also being electrically pumped to define an active internal etalon. Other embodiments have multiple periodic reflectors or combine internal reflectors with feedback gratings or passive windows at the end facets of the body.
    • 激光二极管结构在激光腔内具有内部反射器,以提供激光器操作的稳定光谱模式。 激光器包括设置在基板上的多个连续的半导体层,以形成具有形成有源区的至少一个层的半导体本体。 导电触点偏置异质结构以将电流注入有源区域并产生光波。 反馈意味着定义两个或多个串联谐振光学腔以实现激光操作。 反馈装置包括半导体本体内的至少一个内部光反射器。 在优选实施例中,设置一对间隔开的内部反射器,其间的区域也被电泵浦以限定活动的内标准器。 其他实施例具有多个周期性反射器或将内部反射器与身体的端面处的反馈光栅或无源窗口组合。
    • 8. 发明授权
    • Upconversion fiber laser
    • 上变频光纤激光器
    • US5677920A
    • 1997-10-14
    • US572029
    • 1995-12-14
    • Robert G. WaartsDavid F. WelchSteven SandersDonald R. Scifres
    • Robert G. WaartsDavid F. WelchSteven SandersDonald R. Scifres
    • G02B6/036G02B6/42H01S3/067H01S3/094H01S3/0941H01S5/10H01S5/40H01S3/30
    • G02B6/03638G02B6/03605G02B6/03633H01S3/06708H01S3/094003C03B2201/82C03B2203/12C03B2203/32G02B6/4204H01S3/06729H01S3/0675H01S3/094069H01S3/094092H01S3/0941H01S5/1064H01S5/4025
    • An upconversion fiber laser uses a pump source which may be another fiber laser, such as a high power, diode-laser-pumped, fiber laser. The upconversion fiber laser includes an optical fiber whose core region is doped with an active lasing ionic species capable when optically pumped of undergoing upconversion excitation, such as certain rare earth ionic species, and which is embedded in a cladding of the optical fiber. Use of a fiber pump laser can improve coupling of pump light into the optical fiber, thereby achieving higher pump intensities in the core region and improved upconversion efficiency. The upconversion fiber laser's resonant laser cavity is defined by feedback means which can include at least one reflective grating formed in the optical fiber, as well as a reflective end face of the optical fiber. Any portion of the optical fiber that lies outside of the resonant laser cavity, such as any portion beyond the integral reflective grating, may act as an optical power amplifier for the upconverted laser output. The disclosure includes other embodiments in which pump brightness can be further increased with multiple pump sources.
    • 上转换光纤激光器使用可以是另一种光纤激光器的泵浦源,例如高功率,二极管激光泵浦的光纤激光器。 上转换光纤激光器包括光纤,其核心区域掺杂有当被泵浦经历上转换激发的活性激光离子物质,例如某些稀土离子物质,并且嵌入在光纤的包层中。 使用纤维泵浦激光器可以改善泵浦光与光纤的耦合,从而在芯区域实现更高的泵浦强度,并提高上转换效率。 上变频光纤激光器的谐振激光腔由反射装置限定,该反馈装置可以包括形成在光纤中的至少一个反射光栅以及光纤的反射端面。 位于谐振激光腔外部的光纤的任何部分,例如整个反射光栅之外的任何部分,都可以作为上变频激光输出的光功率放大器。 本公开包括其中可以使用多个泵浦源进一步增加泵亮度的其他实施例。
    • 10. 发明授权
    • Optical amplifier with complementary modulation signal inputs
    • 具有互补调制信号输入的光放大器
    • US5657153A
    • 1997-08-12
    • US408030
    • 1995-03-21
    • John EndrizDavid F. WelchRobert G. WaartsSteven SandersDonald R. Scifres
    • John EndrizDavid F. WelchRobert G. WaartsSteven SandersDonald R. Scifres
    • H04B10/17H01S3/00H04B10/04
    • H04B10/291H04B10/2912H01S3/005H01S3/06712H01S3/06754H01S3/10015H01S3/2383H01S5/06216H01S5/4087
    • In an optical transmission medium, such as a fiber amplifier, two optically distinguishable signals with complementary modulation are both inputted into the amplifying medium for encoding information, particularly a serial stream of digital data, or alternatively, redundant encoding of pulses. The gain profile in the medium is preferably maintained approximately constant at all times, so that whichever amplified signal is used as the primary information carrier, its output intensity will be substantially stable from pulse to pulse, independent of recent pulse history. The two complementary signals may have different orthogonal linear polarizations or wavelengths with the same stimulated emission cross-section, so that the population inversion profile stays constant, whichever signal happens to be on at a given moment. The two signals may be derived from separate intensity modulated laser diode signal sources, from a single laser diode signal source switched between two emission wavelengths, or from a single laser diode with constant emission coupled to a directional coupler directing two complementary polarized light signals into the fiber amplifying medium.
    • 在诸如光纤放大器的光传输介质中,具有互补调制的两个光学可区分信号都被输入到用于对信息进行编码的放大媒体,特别是串行数字数据流,或备选地,脉冲的冗余编码。 介质中的增益分布优选总是保持近似恒定,因此无论使用哪个放大信号作为主信息载体,其输出强度将基本上与脉冲相比稳定,与最近的脉冲历史无关。 两个互补信号可以具有不同的具有相同受激发射横截面的正交线性偏振或波长,使得群体反转谱保持恒定,无论哪个信号在给定时刻发生什么信号。 两个信号可以从单独的强度调制的激光二极管信号源获得,来自在两个发射波长之间切换的单个激光二极管信号源,或者来自具有恒定发射的单个激光二极管耦合到定向耦合器,其将两个互补偏振光信号引入到 光纤放大介质。