公开(公告)号：US10951007B2

公开(公告)日：2021-03-16

申请号：US16409272

申请日：2019-05-10

Applicant: Axsun Technologies, Inc.

Inventor： Bartley C. Johnson ,  Walid A. Atia ,  Peter S. Whitney ,  Mark E. Kuznetsov ,  Edward J. Mallon

IPC: H01S5/183 ,  H01S5/04 ,  H01S5/50 ,  H01S5/022 ,  H01S5/22 ,  H01S5/30 ,  H01S5/343

Abstract: An optically pumped tunable VCSEL swept source module has a VCSEL and a pump, which produces light to pump the VSCEL, wherein the pump is geometrically isolated from the VCSEL. In different embodiments, the pump is geometrically isolated by defocusing light from the pump in front of the VCSEL, behind the VCSEL, and/or by coupling the light from the pump at an angle with respect to the VCSEL. In the last case, angle is usually less than 88 degrees. There are further strategies for attacking pump noise problems. Pump feedback can be reduced through (1) Faraday isolation and (2) geometric isolation. Single frequency pump lasers (Distributed feedback lasers (DFB), distributed Bragg reflector lasers (DBR), Fabry-Perot (FP) lasers, discrete mode lasers, volume Bragg grating (VBG) stabilized lasers can eliminate wavelength jitter and amplitude noise that accompanies mode hopping.

公开(公告)号：US20210050712A1

公开(公告)日：2021-02-18

申请号：US16993953

申请日：2020-08-14

Applicant: Axsun Technologies, Inc.

Inventor： Bartley C. Johnson ,  Mark E. Kuznetsov ,  Peter S. Whitney

IPC: H01S5/183 ,  H01S5/04 ,  H01S5/343

Abstract: A vertical cavity surface emitting laser (VCSEL) has a shortened overall laser cavity by combining the gain section with a distributed Bragg reflector (DBR). The overall cavity length can be contracted by placing gain structures inside the DBR. This generally applies to a number of semiconductor material systems and wavelength bands, but this scheme is very well suited to the AlGaAs/GaAs material system with strained InGaAs quantum wells as a gain medium, for example.

公开(公告)号：US20190386461A1

公开(公告)日：2019-12-19

申请号：US16446303

申请日：2019-06-19

Applicant: Axsun Technologies, Inc.

Inventor： Bartley C. Johnson ,  Mark E. Kuznetsov ,  Walid A. Atia ,  Peter S. Whitney

IPC: H01S5/068 ,  H01S5/183 ,  H01S5/343 ,  H01S5/34

Abstract: Quantum well designs for tunable VCSELs are disclosed that are tolerant of the wavelength shift. Specifically, the active region has even number of substantially uniformly spaced (¼ of the center wavelength in the semiconducting material) quantum wells.

公开(公告)号：US20180259441A1

公开(公告)日：2018-09-13

申请号：US15914221

申请日：2018-03-07

Applicant: Axsun Technologies, Inc.

Inventor： Bartley C. Johnson ,  Joseph Paul Little, III ,  Robert K. Jenner

IPC: G01N15/14 ,  G01N15/06 ,  G01N15/02 ,  G01N21/45 ,  G01N33/28

CPC classification number: G01N15/1434 ,  G01N15/0205 ,  G01N15/0227 ,  G01N15/06 ,  G01N15/1459 ,  G01N21/4133 ,  G01N21/45 ,  G01N33/2835 ,  G01N2015/0693 ,  G01N2015/1075 ,  G01N2015/144 ,  G01N2015/1454 ,  G01N2015/1493

Abstract: A fluid sample is analysed in-line by OCT techniques. The density, size, velocity and other attributes of particles present in a fluid, oil, for example, that is flowing through a conduit.

公开(公告)号：US09593934B2

公开(公告)日：2017-03-14

申请号：US14175158

申请日：2014-02-07

Applicant: Axsun Technologies, Inc.

Inventor： Brian Goldberg ,  Dale C. Flanders ,  Walid A. Atia ,  Bartley C. Johnson ,  Mark E. Kuznetsov

IPC: G01B9/02 ,  G01N21/47 ,  H01S5/14 ,  A61B5/00 ,  H01S5/022 ,  H01S5/40

CPC classification number: G01B9/02091 ,  A61B5/0066 ,  A61B5/0075 ,  G01N21/4795 ,  H01S5/02216 ,  H01S5/02248 ,  H01S5/02284 ,  H01S5/141 ,  H01S5/4012 ,  H01S5/4062 ,  H01S5/4068

Abstract: An optical coherence analysis system comprising: a first swept source that generates a first optical signal that is tuned over a first spectral scan band, a second swept source that generates a second optical signal that is tuned over a second spectral scan band, a combiner for combining the first optical signal and the second optical signal for form a combined optical signal, an interferometer for dividing the combined optical signal between a reference arm leading to a reference reflector and a sample arm leading to a sample, and a detector system for detecting an interference signal generated from the combined optical signal from the reference arm and from the sample arm. In embodiments, the swept sources are tunable lasers that have shared laser cavities.

Abstract translation: 一种光学相干分析系统，包括：第一扫描光源，其产生在第一光谱扫描带上调谐的第一光信号，产生在第二光谱扫描带上调谐的第二光信号的第二扫描光源， 组合第一光信号和第二光信号以形成组合的光信号，用于将导通到参考反射器的参考臂与通向样本的采样臂之间的组合光信号分开的干涉仪，以及用于检测 由来自参考臂和来自采样臂的组合光信号产生的干扰信号。 在实施例中，扫描光源是具有共享激光腔的可调激光器。

公开(公告)号：US20140152997A1

公开(公告)日：2014-06-05

申请号：US14175158

申请日：2014-02-07

Applicant: Axsun Technologies, Inc.

Inventor： Brian Goldberg ,  Dale C. Flanders ,  Walid A. Atia ,  Bartley C. Johnson ,  Mark E. Kuznetsov

IPC: G01B9/02

CPC classification number: G01B9/02091 ,  A61B5/0066 ,  A61B5/0075 ,  G01N21/4795 ,  H01S5/02216 ,  H01S5/02248 ,  H01S5/02284 ,  H01S5/141 ,  H01S5/4012 ,  H01S5/4062 ,  H01S5/4068

Abstract: An optical coherence analysis system comprising: a first swept source that generates a first optical signal that is tuned over a first spectral scan band, a second swept source that generates a second optical signal that is tuned over a second spectral scan band, a combiner for combining the first optical signal and the second optical signal for form a combined optical signal, an interferometer for dividing the combined optical signal between a reference arm leading to a reference reflector and a sample arm leading to a sample, and a detector system for detecting an interference signal generated from the combined optical signal from the reference arm and from the sample arm. In embodiments, the swept sources are tunable lasers that have shared laser cavities.

Abstract translation: 一种光学相干分析系统，包括：第一扫描光源，其产生在第一光谱扫描带上调谐的第一光信号，产生在第二光谱扫描带上调谐的第二光信号的第二扫描光源， 组合第一光信号和第二光信号以形成组合的光信号，用于将导通到参考反射器的参考臂与通向样本的采样臂之间的组合光信号分开的干涉仪，以及用于检测 由来自参考臂和来自采样臂的组合光信号产生的干扰信号。 在实施例中，扫描光源是具有共享激光腔的可调激光器。

公开(公告)号：US20140125986A1

公开(公告)日：2014-05-08

申请号：US13670935

申请日：2012-11-07

Applicant: Axsun Technologies, Inc.

Inventor： Bartley C. Johnson ,  Dale C. Flanders

IPC: G01B9/02

CPC classification number: G01B9/02091 ,  G01B9/02004 ,  G01B9/02069

Abstract: An OCT system and particularly its clock system generates a k-clock signal but also generates an optical frequency reference sweep signal that, for example, indicates the start of the sweep or an absolute frequency reference associated with the sweep at least for the purposes of sampling of the interference signal and/or processing of that interference signal into the OCT images. The clock system is also tunable to allow the control or flexibility over the relationship between the scanning of the swept optical signal and the sampling of the interference signal by the data acquisition system. Specifically, the absolute frequencies of the swept optical signal at which the k-clock signals are generated can be adjusted. Also, the absolute frequency of the swept optical signal at which sampling of the interference signal is initiated can also be changed or stabilized. Moreover, optical frequency sampling interval defined by the k-clock signal can be changed under user control or simply stabilized.

Abstract translation: OCT系统，特别是其时钟系统产生k时钟信号，但是还产生光频参考扫描信号，其例如指示扫描的开始或与扫描相关联的绝对频率参考至少为了采样的目的 的干扰信号和/或将该干扰信号处理到OCT图像中。 时钟系统也是可调谐的，以允许对扫描光信号的扫描与数据采集系统对干扰信号的采样之间的关系的控制或灵活性。 具体地说，可以调整产生k时钟信号的扫描光信号的绝对频率。 此外，也可以改变或稳定干扰信号的采样开始的扫描光信号的绝对频率。 此外，由k时钟信号定义的光频采样间隔可以在用户控制下简单地稳定化。

公开(公告)号：US20140119397A1

公开(公告)日：2014-05-01

申请号：US14150122

申请日：2014-01-08

Applicant: Axsun Technologies, Inc.

Inventor： Peter S. Whitney ,  Dale C. Flanders

IPC: H01S5/026 ,  G01B9/02

CPC classification number: H01S5/026 ,  G01B9/02091 ,  H01S5/022 ,  H01S5/02216 ,  H01S5/0222 ,  H01S5/02224 ,  H01S5/02248 ,  H01S5/02284 ,  H01S5/02415 ,  H01S5/02438 ,  H01S5/068 ,  H01S5/06825 ,  H01S5/141 ,  H01S5/183

Abstract: Dry oxygen, dry air, or other gases such as ozone are hermetically sealed within the package of the external cavity laser or ASE swept source to avoid packaging-induced failure or PLF. PIF due to hydrocarbon breakdown at optical interfaces with high power densities is believed to occur at the SLED and/or SOA facets as well as the tunable Fabry-Perot reflector/filter elements and/or output fiber. Because the laser is an external cavity tunable laser and the configuration of the ASE swept sources, the power output can be low while the internal power at surfaces can be high leading to PIF at output powers much lower than the 50 mW.

Abstract translation: 干氧，干燥空气或其他气体如臭氧气密封在外腔激光器或ASE扫频源的封装内，以避免包装引起的故障或PLF。 相信在SLED和/或SOA面以及可调谐法布里 - 珀罗反射器/滤波器元件和/或输出光纤处发生由于在具有高功率密度的光学接口处的烃破坏引起的PIF。 因为激光器是外部可调谐激光器和ASE扫频源的配置，所以功率输出可能很低，而表面的内部功率可能很高，导致PIF的输出功率远低于50 mW。

公开(公告)号：US20140016135A1

公开(公告)日：2014-01-16

申请号：US14028873

申请日：2013-09-17

Applicant: Axsun Technologies, Inc.

Inventor： Dale C. Flanders ,  Walid A. Atia ,  Bartley C. Johnson ,  Mark E. Kuznetsov ,  Carlos R. Melendez

IPC: G01B9/02

CPC classification number: G01B9/02091 ,  G01B9/02004 ,  G01B9/02044 ,  G01B9/02059 ,  G01B9/02069 ,  G01B2290/25 ,  H01S3/08013 ,  H01S3/08054 ,  H01S3/1067 ,  H01S5/02248 ,  H01S5/02415 ,  H01S5/068 ,  H01S5/141 ,  H01S5/146

Abstract: A frequency swept laser source for TEFD-OCT imaging includes an integrated clock subsystem on the optical bench with the laser source. The clock subsystem generates frequency clock signals as the optical signal is tuned over the scan band. Preferably the laser source further includes a cavity extender in its optical cavity between a tunable filter and gain medium to increase an optical distance between the tunable filter and the gain medium in order to control the location of laser intensity pattern noise. The laser also includes a fiber stub that allows for control over the cavity length while also controlling birefringence in the cavity.

Abstract translation: 用于TEFD-OCT成像的频率扫描激光源包括具有激光源的光学台上的集成时钟子系统。 当光信号在扫描带上调谐时，时钟子系统产生频率时钟信号。 优选地，激光源还包括在可调谐滤波器和增益介质之间的光腔中的腔体延长器，以增加可调谐滤波器和增益介质之间的光学距离，以便控制激光强度图案噪声的位置。 该激光器还包括一个纤维短截线，其允许控制腔体长度，同时还控制空腔中的双折射。

公开(公告)号：US20030202190A1

公开(公告)日：2003-10-30

申请号：US10440838

申请日：2003-05-16

Applicant: Axsun Technologies, Inc.

Inventor： Walid A. Atia ,  Randal A. Murdza

IPC: G01B009/02

CPC classification number: G02B6/4246 ,  G02B6/29358 ,  G02B6/29395 ,  G02B6/4222

Abstract: A process for tunable filter train alignment comprises detecting a spectral response of the filter train and aligning an optical fiber that transmits an input optical signal to the filter train during operation. Further, the tunable filter is moved relative to the filter train in response to a spectral response of the filter train. As a result, the alignment and spectral response of the tunable filter train are optimized. In the preferred embodiment, the alignment and SMSR optimization occur simultaneously with respect to each other.

Abstract translation: 可调谐过滤器排列的过程包括检测过滤器系列的光谱响应并使在操作期间将输入光信号传输到过滤器列的光纤对准。 此外，响应于过滤器列的频谱响应，可调谐滤波器相对于滤波器序列移动。 结果，优化了可调滤波器串的对准和光谱响应。 在优选实施例中，对齐和SMSR优化相对于彼此同时发生。