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公开(公告)号：US10359551B2
公开(公告)日：2019-07-23
申请号：US13964169
申请日：2013-08-12
Applicant: Axsun Technologies, Inc.
Inventor： Mark E. Kuznetsov , Ranko Galeb
Abstract: The present invention concerns the use of hybrid metal-dielectric optical coatings as the end reflectors of laser cavities and/or in the mirror structures used in other optical resonators, such as Fabry-Perot tunable filters, along with the use of such Fabry-Perot tunable filters in wavelength swept sources such as lasers. Hybrid metal-dielectric optical coatings have reflectivity spectra that can be broader than pure dielectric coatings, offer optical reflectivities higher than metal, as high as pure dielectric coatings, eliminate mirror transmission that can cause parasitic light reflections, and use fewer layers and thus have lower mass and higher mechanical resonant frequency for movable mirror applications An important characteristic of these coatings concerns the non-reflected light. Pure dielectric coatings offer high reflectivity, while the non-reflected portion of the light is transmitted by the coating to the substrate, for example. When metal is added to the optical coating, the non-reflected portion of the light is absorbed by the metal and is not transmitted to the substrate or outside the cavity. Hybrid metal-dielectric coatings have broader and more uniform spectral reflection. Tunable lasers with performance enhanced by the hybrid metal-dielectric coatings can be used in optical coherence tomography and spectroscopic analysis applications.
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公开(公告)号：US09696471B2
公开(公告)日：2017-07-04
申请号：US13847616
申请日：2013-03-20
Applicant: Axsun Technologies, Inc.
Inventor： Dale C. Flanders , Walid A. Atia , Mark E. Kuznetsov
CPC classification number: G02B5/22 , G01B9/02004 , G01B9/02091 , G01J3/10 , G01J3/26 , G01J3/4338 , G01N21/4795
Abstract: An integrated swept wavelength optical source uses a filtered ASE signal with an optical amplifier and tracking filter. This source comprises a micro optical bench, a source for generating broadband light, a first tunable Fabry Perot filter, installed on the bench, for spectrally filtering the broadband light from the broadband source to generate a narrowband tunable signal, an amplifier, installed on the bench, for amplifying the tunable signal, and a second tunable Fabry Perot filter, installed on the bench, for spectrally filtering the amplified tunable signal from the amplifier. A self-tracking arrangement is also possible where a single tunable filter both generates the narrowband signal and spectrally filters the amplified signal. In some examples, two-stage amplification is provided. The use of a single bench implementation yields a low cost high performance system. For example, polarization control between components is no longer necessary.
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公开(公告)号：US10855053B2
公开(公告)日：2020-12-01
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：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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Patent Agency Ranking
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：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
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。
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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。
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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。
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公开(公告)号：US10951009B2
公开(公告)日：2021-03-16
申请号：US16409295
申请日：2019-05-10
Applicant: Axsun Technologies, Inc.
Inventor： Bartley C. Johnson , Mark R. Malonson , Walid A. Atia , Mark E. Kuznetsov , James W. Getz , Peter S. Whitney
Abstract: A design and method for introducing asymmetric crystal strain to control polarization in a tunable VCSEL, either optically or electrically pumped. The invention is especially relevant to wafer- or die-bonded tunable VCSELs. Then, mechanical stress is applied to the half VCSEL device by asymmetric arrangement of metal bond pads.
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