Patents by Inventor Vijaysekhar Jayaraman
Vijaysekhar Jayaraman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9915520Abstract: An optical instrument including at least a first and second wavelength swept vertical cavity laser (VCL) sources. The wavelength sweeping ranges spanned by the first and second VCL sources may differ with a region of spectral overlap. The first and second VCL sources may be operable under different modes of operation, wherein the modes of operation differ in at least one of: sweep repetition rate, sweep wavelength range, sweep center wavelength, and sweep trajectory. A VCL source may also exhibit sweep-to-sweep variation. Apparatus and methods are described for aligning sample signal data from the first VCL and sample signal data from the second VCL to generate output digital data. The output digital data is aligned with respect to at least one of: wavelength, wavenumber, and interferometric phase. The apparatus and methods can also be used to phase stabilize successive sweeps from the same VCL source or wavelength swept source.Type: GrantFiled: September 14, 2016Date of Patent: March 13, 2018Assignees: Thorlabs, Inc., Praevium Research, Inc.Inventors: Alex Cable, Vijaysekhar Jayaraman, James Jiang, Benjamin Potsaid
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Publication number: 20170373469Abstract: A high-speed, single-mode, high power, reliable and manufacturable wavelength-tunable light source operative to emit wavelength tunable radiation over a wavelength range contained in a wavelength span between about 950 nm and about 1150 nm, including a vertical cavity laser (VCL), the VCL having a gain region with at least one compressively strained quantum well containing Indium, Gallium, and Arsenic.Type: ApplicationFiled: August 22, 2017Publication date: December 28, 2017Inventors: Vijaysekhar Jayaraman, Christopher Burgner, Demis John, Peter Heim, Alex Ezra Cable
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Patent number: 9843159Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.Type: GrantFiled: July 26, 2013Date of Patent: December 12, 2017Assignees: Thorlabs, Inc., Praevium Research, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Patent number: 9774166Abstract: A high-speed, single-mode, high power, reliable and manufacturable wavelength-tunable light source operative to emit wavelength tunable radiation over a wavelength range contained in a wavelength span between about 950 nm and about 1150 nm, including a vertical cavity laser (VCL), the VCL having a gain region with at least one compressively strained quantum well containing Indium, Gallium, and Arsenic.Type: GrantFiled: March 14, 2014Date of Patent: September 26, 2017Assignees: Praevium Research, Inc., Thorlabs, Inc.Inventors: Vijaysekhar Jayaraman, Christopher Burgner, Demis John, Peter Heim, Alex Ezra Cable
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Publication number: 20170256910Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.Type: ApplicationFiled: May 19, 2017Publication date: September 7, 2017Inventors: Alex Ezra CABLE, Vijaysekhar JAYARAMAN, Benjamin Michael POTSAID
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Publication number: 20170205223Abstract: An agile optical imaging system for optical coherence tomography imaging using a tunable source comprising a wavelength tunable VCL laser is disclosed. The tunable source has long coherence length and is capable of high sweep repetition rate, as well as changing the sweep trajectory, sweep speed, sweep repetition rate, sweep linearity, and emission wavelength range on the fly to support multiple modes of OCT imaging. The imaging system also offers new enhanced dynamic range imaging capability for accommodating bright reflections. Multiscale imaging capability allows measurement over orders of magnitude dimensional scales. The imaging system and methods for generating the waveforms to drive the tunable laser in flexible and agile modes of operation are also described.Type: ApplicationFiled: April 3, 2017Publication date: July 20, 2017Inventors: Alex Ezra CABLE, Vijaysekhar Jayaraman, James JIANG, Benjamin Potsaid
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Patent number: 9696132Abstract: A system for swept source optical coherence tomography, the system including a light source emitting multiplexed wavelength-swept radiation over a total wavelength range, the light source including N wavelength-swept vertical cavity lasers (VCL) emitting N tunable VCL outputs having N wavelength trajectories, a combiner for combining the N tunable VCL optical outputs into a common optical path to create the multiplexed wavelength-swept radiation, a splitter for splitting the multiplexed wavelength-swept radiation to a sample and a reference path, an optical detector for detecting an interference signal created by an optical interference between a reflection from the sample and light traversing the reference path, and a signal processing system which uses the interference signal to construct an image of the sample, wherein at least one of the N wavelength trajectories differs from another of the N wavelength trajectories with respect to at least one parameter.Type: GrantFiled: March 14, 2014Date of Patent: July 4, 2017Assignees: Praevium Research, Inc., Thorlabs, Inc.Inventors: Vijaysekhar Jayaraman, Christopher Burgner, Demis John, Benjamin Michael Potsaid, Alex Ezra Cable
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Publication number: 20170074640Abstract: An optical instrument including at least a first and second wavelength swept vertical cavity laser (VCL) sources. The wavelength sweeping ranges spanned by the first and second VCL sources may differ with a region of spectral overlap. The first and second VCL sources may be operable under different modes of operation, wherein the modes of operation differ in at least one of: sweep repetition rate, sweep wavelength range, sweep center wavelength, and sweep trajectory. A VCL source may also exhibit sweep-to-sweep variation. Apparatus and methods are described for aligning sample signal data from the first VCL and sample signal data from the second VCL to generate output digital data. The output digital data is aligned with respect to at least one of: wavelength, wavenumber, and interferometric phase. The apparatus and methods can also be used to phase stabilize successive sweeps from the same VCL source or wavelength swept source.Type: ApplicationFiled: September 14, 2016Publication date: March 16, 2017Inventors: Alex Cable, Vijaysekhar Jayaraman, James Jiang, Benjamin Potsaid
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Publication number: 20160301189Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.Type: ApplicationFiled: July 26, 2013Publication date: October 13, 2016Applicants: Praevium Research, Inc., Thorlabs, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Patent number: 9413133Abstract: An amplified tunable source includes a short-cavity laser coupled to an optical amplifier for high power, spectrally shaped operation. The short-cavity laser is coupled to a quantum well semiconductor optical amplifier with two quantum states for broadened gain. Two preferred wavelength ranges of the amplified tunable source include 1200-1400 nm and 800-1100 nm. Also disclosed is the short cavity tunable laser coupled to a fiber amplifier. Various combinations of tunable optical filters with the amplified tunable source to reduce noise or improve spectral purity are presented.Type: GrantFiled: October 8, 2015Date of Patent: August 9, 2016Assignee: Thorlabs, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Patent number: 9397468Abstract: Optical systems employ a tunable source which includes a short cavity laser with a large free spectral range cavity, fast tuning response, and single transverse and longitudinal mode operation. Systems for optical spectroscopy with optimized scanning, a system for optical beam steering and a system for a tunable local oscillator are disclosed.Type: GrantFiled: October 8, 2015Date of Patent: July 19, 2016Assignees: Thorlabs, Inc., Praevium Research, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Patent number: 9391422Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. A short cavity laser with a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation is disclosed. Methods for obtaining polarization stable operation of the tunable source are presented.Type: GrantFiled: October 8, 2015Date of Patent: July 12, 2016Assignee: Thorlabs, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman
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Publication number: 20160028207Abstract: An amplified tunable source includes a short-cavity laser coupled to an optical amplifier for high power, spectrally shaped operation. The short-cavity laser is coupled to a quantum well semiconductor optical amplifier with two quantum states for broadened gain. Two preferred wavelength ranges of the amplified tunable source include 1200-1400 nm and 800-1100 nm. Also disclosed is the short cavity tunable laser coupled to a fiber amplifier. Various combinations of tunable optical filters with the amplified tunable source to reduce noise or improve spectral purity are presented.Type: ApplicationFiled: October 8, 2015Publication date: January 28, 2016Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Publication number: 20160028208Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. A short cavity laser with a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation is disclosed. Methods for obtaining polarization stable operation of the tunable source are presented.Type: ApplicationFiled: October 8, 2015Publication date: January 28, 2016Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Publication number: 20160028212Abstract: Optical systems employ a tunable source which includes a short cavity laser with a large free spectral range cavity, fast tuning response, and single transverse and longitudinal mode operation. Systems for optical spectroscopy with optimized scanning, a system for optical beam steering and a system for a tunable local oscillator are disclosed.Type: ApplicationFiled: October 8, 2015Publication date: January 28, 2016Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
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Publication number: 20140268169Abstract: A high-speed, single-mode, high power, reliable and manufacturable wavelength-tunable light source operative to emit wavelength tunable radiation over a wavelength range contained in a wavelength span between about 950 nm and about 1150 nm, including a vertical cavity laser (VCL), the VCL having a gain region with at least one compressively strained quantum well containing Indium, Gallium, and Arsenic.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicants: Thorlabs, Inc., Praevium Research, Inc.Inventors: Vijaysekhar Jayaraman, Christopher Burgner, Demis John, Peter Heim, Alex Ezra Cable
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Publication number: 20140268050Abstract: A system for swept source optical coherence tomography, the system including a light source emitting multiplexed wavelength-swept radiation over a total wavelength range, the light source including N wavelength-swept vertical cavity lasers (VCL) emitting N tunable VCL outputs having N wavelength trajectories, a combiner for combining the N tunable VCL optical outputs into a common optical path to create the multiplexed wavelength-swept radiation, a splitter for splitting the multiplexed wavelength-swept radiation to a sample and a reference path, an optical detector for detecting an interference signal created by an optical interference between a reflection from the sample and light traversing the reference path, and a signal processing system which uses the interference signal to construct an image of the sample, wherein at least one of the N wavelength trajectories differs from another of the N wavelength trajectories with respect to at least one parameter.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicants: Thorlabs, Inc., Praevium Research, Inc.Inventors: Vijaysekhar Jayaraman, Christopher Burgner, Demis John, Benjamin Michael Potsaid, Alex Ezra Cable
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Publication number: 20140028997Abstract: An agile optical imaging system for optical coherence tomography imaging using a tunable source comprising a wavelength tunable VCL laser is disclosed. The tunable source has long coherence length and is capable of high sweep repetition rate, as well as changing the sweep trajectory, sweep speed, sweep repetition rate, sweep linearity, and emission wavelength range on the fly to support multiple modes of OCT imaging. The imaging system also offers new enhanced dynamic range imaging capability for accommodating bright reflections. Multiscale imaging capability allows measurement over orders of magnitude dimensional scales. The imaging system and methods for generating the waveforms to drive the tunable laser in flexible and agile modes of operation are also described.Type: ApplicationFiled: July 26, 2013Publication date: January 30, 2014Applicants: Praevium Research, Inc., Thorlabs, Inc.Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid, Peter Heim, Scott Barry, James Yi Jiang, Anjul Davis
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Patent number: 7880882Abstract: The invention discloses a system for optical spectroscopy comprising a multi-wavelength semiconductor light source comprising a plurality of semiconductor light sources disposed on a silicon sub-carrier and emitting a plurality of radiation components spanning a wavelength range. The radiation components are coupled to a waveguide array disposed on the same silicon subcarrier. Output from the waveguide array provides a compact multi-wavelength laser source with wide tuning range via a plurality of laser sources. The system further comprises means for directing radiation components to a sample, and an optical detector configured to detect one of a radiation reflected from and transmitted through said sample. The system can be used in a variety of applications including the analysis of in-vivo human tissue, agricultural samples, and pharmaceutical samples. Typical wavelength ranges are 650-1000 nm, 700-1700 nm, and 1100-2500 nm.Type: GrantFiled: June 6, 2008Date of Patent: February 1, 2011Assignee: Praevium Research, Inc.Inventors: Vijaysekhar Jayaraman, Timothy Andrew Strand, Devin Blaine Leonard
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Patent number: 7671997Abstract: A superluminescent diode according the present invention employs a uniform AlGaInAs quantum well on an InP substrate, emitting in a range of 1100 to 1800 nm. The favorable conduction band: valence band offset ratio of this material system enables superluminescent diodes which simultaneously provide high power and large optical bandwidth. A recent reduction to practice of the present invention simultaneously demonstrates output power exceeding 100 mW and bandwidth exceeding 100 nm. A preferred embodiment of this invention uses multiple uniform AlGaInAs quantum wells with two confined quantum states and energetic separation in a range of 100-130 nm. An alternate preferred embodiment uses non-uniform wells, with each well having two confined quantum states. The present invention is particularly useful in time domain and spectral domain optical coherence tomography systems, providing increased resolution and tissue penetration for in-vivo imaging.Type: GrantFiled: October 30, 2007Date of Patent: March 2, 2010Inventors: Vijaysekhar Jayaraman, Eric Hall