1. Dale Flanders

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    1. Mentioned In 52 Articles

    2. Optical coherence tomography (OCT) system having integrated detector and analysis systems

      Optical coherence tomography (OCT) system having integrated detector and analysis systems
      An optical detector system comprises a hermetic optoelectronic package, an optical bench installed within the optoelectronic package, a balanced detector system installed on the optical bench. The balanced detector system includes at least two optical detectors that receive interference signals. An electronic amplifier system installed within the optoelectronic package amplifies an output of at least two optical detectors. Also disclosed is an integrated optical coherence tomography system. Embodiments are provided ...
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    3. Laser swept source with controlled mode locking for OCT medical imaging

      Laser swept source with controlled mode locking for OCT medical imaging
      An optical coherence analysis system uses a laser swept source that is constrained to operate in a mode locked condition. This is accomplished by synchronously changing the laser cavity's gain and/or phase based on the round trip travel time of light in the cavity. Many high-speed wavelength swept laser sources emit pulses synchronized with the round trip time of the cavity as part of a nonlinear optical frequency ...
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    4. OCT swept laser with cavity length compensation

      OCT swept laser with cavity length compensation
      An optical coherence tomography system utilizes an optical swept laser that has cavity length compensator that changes an optical length of the laser cavity for different optical frequencies to increase the length of the laser cavity for lower optical frequencies. Specifically, a spectral separation between longitudinal cavity modes of the laser cavity is shortened or alternatively lengthened as a passband of a cavity tuning element sweeps through a scanband of ...
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    5. Long-to-short wavelength swept source

      Long-to-short wavelength swept source
      Most swept external cavity diode lasers tune in the short-to-long wavelength direction (red tuning). Lower relative intensity noise (RIN) and higher output power are typically possible in this direction. We show here that long-to-short tuning (blue tuning) is possible for a short, linear cavity laser that has both low noise and high power. This mode of operation is made possible by nonlinear frequency broadening in the semiconductor optical amplifier (SOA ...
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    6. OCT system with bonded MEMS tunable mirror VCSEL swept source

      OCT system with bonded MEMS tunable mirror VCSEL swept source
      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 ...
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    7. Integrated optical coherence analysis system

      Integrated optical coherence analysis system
      Optical coherence tomography (OCT) probe and system designs are disclosed that minimize the effects of mechanical movement and strain to the probe to the OCT analysis. It also concerns optical designs that are robust against noise from the OCT laser source. Also integrated OCT system-probes are included that yield compact and robust electro-opto-mechanical systems along with polarization sensitive OCT systems.
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    8. Integrated dual swept source alternating same scan band for OCT medical imaging

      Integrated dual swept source alternating same scan band for OCT medical imaging
      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 to form a combined optical signal, an interferometer for dividing the combined optical ...
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    9. Coherence properties of short cavity swept lasers

      Coherence properties of short cavity swept lasers
      It has been shown theoretically and experimentally that short cavity swept lasers are passively mode locked. We develop a mathematical model of these lasers and the light field solutions are used to predict the coherence length and coherence revival behavior. The calculations compare favorably with data from a 9901100 nm laser swept at 100 kHz suitable for optical coherence tomography applications.
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    10. SNR of swept SLEDs and swept lasers for OCT

      SNR of swept SLEDs and swept lasers for OCT
      A back-to-back comparison of a tunable narrow-band-filtered SLED (TSLED) and a swept laser are made for OCT applications. The two sources are similar in terms of sweep speed, tuning range and coherence length. A fundamental issue with a TSLED is that the RIN is proportional to 1/linewidth, meaning that the longer the coherence length, the higher the RIN and clock jitter. We show that the TSLED has an SNR ...
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    11. Swept frequency laser for FD-OCT with intracavity element and method of operation

      Swept frequency laser for FD-OCT with intracavity element and method of operation
      A frequency swept laser source that generates an optical signal that is tuned over a spectral scan band at single discrete wavelengths associated with longitudinal modes of the swept laser source. Laser hopping over discrete single cavity modes allows long laser coherence length even under dynamic very high speed tuning conditions. A ramp drive to the laser is used to linearize laser frequency tuning. A beam splitter is used to ...
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    12. OCT swept laser with high coherence signal extraction

      OCT swept laser with high coherence signal extraction
      An optical coherence tomography system utilizes an optical swept laser that has improved coherence length in the swept optical signal. This is accomplished using an intra-cavity element that extracts the tunable optical signal at the optimal location within the laser's resonant cavity. Generally this location is between the intracavity tuning element and the cavity's gain element so that light coming from the tuning element is extracted. In general ...
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    13. Multi-speed OCT swept source with optimized k-clock

      Multi-speed OCT swept source with optimized k-clock
      An optical coherence tomography system utilizes an optical swept source that frequency scans at least two different sweep rates. In this way, the system can perform large depth scans of the sample and then the same system can perform shorter depth high precision scans, in one specific example. In order to optimally use the analog to digital converter that samples the interference signal, the system further samples the interference signals ...
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    14. Integrated OCT detector system with transimpedance amplifier

      Integrated OCT detector system with transimpedance amplifier
      An optical detector system comprises a hermetic optoelectronic package, an optical bench installed within the optoelectronic package, a balanced detector system installed on the optical bench. The balanced detector system includes at least two optical detectors that receive interference signals. An electronic amplifier system installed within the optoelectronic package amplifies an output of at least two optical detectors. Also disclosed is an integrated optical coherence tomography system. Embodiments are provided ...
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    15. Analysis of a spinning polygon wavelength swept laser

      Analysis of a spinning polygon wavelength swept laser
      It has been known for quite some time that spinning polygon, and similar, swept lasers used in OCT favor the short to long wavelength sweep direction because of four wave mixing in the gain medium. Here we have reformulated the problem in the time domain and show experimentally and through numerical simulation that these lasers are pulsed. The emitted pulses modulate the gain medium refractive index to red shift the ...
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    16. OCT System With Bonded Mems Tunable Mirror Vcsel Swept Source

      OCT System With Bonded Mems Tunable Mirror Vcsel Swept Source
      A microelectromechanical systems (MEMS)-tunable vertical-cavity surface emitting laser (VCSEL) in which the MEMS mirror is a 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 ...
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    17. 1-15 of 52 1 2 3 4 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Dale Flanders

    Dale Flanders

    Dale C. Flanders, Ph.D, is Founder, Pesident and CEO, Chairman of the Board of Axsun Technologies.  Dr. Flanders joined Axsun from Lasertron, Inc, where he served in several key technical roles, including Vice President of Engineering and Chief Technology Officer from 1985 to 1998. Prior to Lasertron, he performed research at Bell Labs and at MIT's Lincoln Laboratory. Dr. Flanders received a B.S., M.S. and Ph.D. in Electrical Engineering from MIT, and is the holder of 40 patents.

  3. Quotes

    1. It's been very interesting. We've gone from the same technology as for telecommunications to manufacturing and now medical imaging.
      In A high-tech homecoming: Entrepreneur returns to Maine with an eye toward economic development ‘the right way’
    2. Axsun has developed an entirely new class of tunable optical engines based upon our unique MEMS based technology platform. It is clear that medical imaging represents one of the largest growth markets in which to fully exploit this technology. Our capability of precise imaging is delivered with a level of performance and on a scale of miniaturization and at a cost that should enable significant expansion of varied market opportunities in a number of medical specialties. We are also pleased to merge with a company with the resources and managerial strength of Volcano to help us build on our leadership position in the communications and industrial spectroscopy markets.
      In Medical imaging company acquires Axsun Technologies for its OCT expertise