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11.发明申请公开(公告)号：US20200096311A1
公开(公告)日：2020-03-26
申请号：US16580847
申请日：2019-09-24
Applicant: Axsun Technologies, Inc.
Inventor： Bartley C. Johnson , Timothy N. Ford , Seungbum Woo , Walid A. Atia
IPC: G01B9/02
Abstract: Methods and systems for increasing resolution and mitigating sidelobe artifacts on point spread functions in optical coherence tomography systems by addressing (1) the swept source's power variation across the scan band, (2) errors in sampling instances, and (3) window function selection.
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公开(公告)号：US20190027895A1
公开(公告)日：2019-01-24
申请号：US16129856
申请日：2018-09-13
Applicant: Axsun Technologies, Inc.
Inventor： Dale C. Flanders , Mark E. Kuznetsov , Walid A. Atia , Bartley C. Johnson
Abstract: A microelectromechanical systems (MEMS)-tunable vertical-cavity surface-emitting laser (VCSEL) in which the MEMS mirror is bonded to the active region. This allows for a separate electrostatic cavity that is outside the laser's optical resonant cavity. Moreover, the use of this cavity configuration allows the MEMS mirror to be tuned by pulling the mirror away from the active region. This reduces the risk of snap down. Moreover, since the MEMS mirror is now bonded to the active region, much wider latitude is available in the technologies that are used to fabricate the MEMS mirror. This is preferably deployed as a swept source in an optical coherence tomography (OCT) system.
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公开(公告)号：US10184783B2
公开(公告)日：2019-01-22
申请号：US15785142
申请日：2017-10-16
Applicant: Axsun Technologies, Inc.
Inventor： Dale C. Flanders , Walid A. Atia , Bartley C. Johnson , Mark E. Kuznetsov , Carlos R. Melendez
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.
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公开(公告)号：US20180051978A1
公开(公告)日：2018-02-22
申请号：US15785142
申请日：2017-10-16
Applicant: Axsun Technologies, Inc.
Inventor： Dale C. Flanders , Walid A. Atia , Bartley C. Johnson , Mark E. Kuznetsov , Carlos R. Melendez
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.
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公开(公告)号：US08836953B2
公开(公告)日：2014-09-16
申请号：US13670938
申请日：2012-11-07
Applicant: Axsun Technologies, Inc.
Inventor： Bartley C. Johnson
CPC classification number: G01B9/02 , G01B9/02004 , G01B9/02069 , G01B9/02091
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. This optical frequency reference sweep signal is generated at exactly the same frequency of the swept optical signal from sweep to sweep of that signal. This ensures that the sampling of the interference signal occurs at the same frequencies, sweep to sweep. Such a system is relevant to a number of applications in which it is important that successive sweeps of the swept optical signal be very stable with respect to each other.
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。 这个光频参考扫描信号在扫描光信号的扫描到扫描的完全相同的频率上产生。 这确保干扰信号的采样以相同的频率发生，扫掠扫描。 这样的系统与许多应用相关，其中重要的是扫描光信号的连续扫描相对于彼此非常稳定。
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Patent Agency Ranking
公开(公告)号：US20140125991A1
公开(公告)日：2014-05-08
申请号：US13670938
申请日：2012-11-07
Applicant: Axsun Technologies, Inc
Inventor： Bartley C. Johnson
IPC: G01B9/02
CPC classification number: G01B9/02 , G01B9/02004 , G01B9/02069 , G01B9/02091
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. This optical frequency reference sweep signal is generated at exactly the same frequency of the swept optical signal from sweep to sweep of that signal. This ensures that the sampling of the interference signal occurs at the same frequencies, sweep to sweep. Such a system is relevant to a number of applications in which it is important that successive sweeps of the swept optical signal be very stable with respect to each other. One specific example is phase sensitive OCT. This requires that the sampling of the interference signal occurs at exactly the same frequency/wavelength on every axial line (A-line). Such phase sensitive OCT has particular applications in Doppler OCT, synthetic aperture imaging, and in the subtraction of background noise sources from the OCT image.
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。 这个光频参考扫描信号在扫描光信号的扫描到扫描的完全相同的频率上产生。 这确保干扰信号的采样以相同的频率发生，扫掠扫描。 这样的系统与许多应用相关，其中重要的是扫描光信号的连续扫描相对于彼此非常稳定。 一个具体的例子是相位敏感OCT。 这要求干扰信号的采样在每个轴线（A线）上以完全相同的频率/波长发生。 这种相位敏感OCT在多普勒OCT，合成孔径成像以及从OCT图像中减去背景噪声源方面具有特殊应用。
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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
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.
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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
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.
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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
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.
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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
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.
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