1. Articles from Dennis Derickson

    1-6 of 6
    1. System and method of dynamic and adaptive creation of a wavelength continuous and prescribed wavelength versus time sweep from a laser

      System and method of dynamic and adaptive creation of a wavelength continuous and prescribed wavelength versus time sweep from a laser

      A system (10, 20) and method including a wavelength tuning mechanism and a laser path length tuning mechanism for reducing discontinuities in a sweep range. A processor (14) is coupled to a wavelength monitoring device (18) and the tuning mechanisms. The processor analyzes data from the wavelength monitor to adjust the wavelength tuning and cavity length tuning at discontinuities in the wavelength sweep to reduce the discontinuities.

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    2. System and method for generating an optimum side-mode suppression ratio continuous tuning path for a semiconductor tunable laser

      System and method for generating an optimum side-mode suppression ratio continuous tuning path for a semiconductor tunable laser

      A system and method to determine data sets of front mirror current, back mirror current and phase current that change the wavelength output by a semiconductor laser in a prescribed trajectory versus time, while maintaining the maximum side-mode suppression ratio at each point during the sweep.

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    3. All-semiconductor high-speed akinetic swept-source for OCT

      All-semiconductor high-speed akinetic swept-source for OCT

      A novel swept-wavelength laser for optical coherence tomography (OCT) using a monolithic semiconductor device with no moving parts is presented. The laser is a Vernier-Tuned Distributed Bragg Reflector (VT-DBR) structure exhibiting a single longitudinal mode. All-electronic wavelength tuning is achieved at a 200 kHz sweep repetition rate, 20 mW output power, over 100 nm sweep width and coherence length longer than 40 mm. OCT point-spread functions with 45- 55 dB dynamic range are demonstrated; lasers at 1550 nm, and now 1310 nm, have been developed. Because the laser's long-term tuning stability allows for electronic sample trigger generation at equal ...

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    4. High-speed concatenation of frequency ramps using sampled grating distributed Bragg reflector laser diode sources for OCT resolution enhancement

      High-speed concatenation of frequency ramps using sampled grating distributed Bragg reflector laser diode sources for OCT resolution enhancement

      Wavelength tunable sampled grating distributed Bragg reflector (SG-DBR) lasers used for telecommunications applications have previously demonstrated the ability for linear frequency ramps covering the entire tuning range of the laser at 100 kHz repetition rates1. An individual SG-DBR laser has a typical tuning range of 50 nm. The InGaAs/InP material system often used with SG-DBR lasers allows for design variations that cover the 1250 to 1650 nm wavelength range. This paper addresses the possibility of concatenating the outputs of tunable SGDBR lasers covering adjacent wavelength ranges for enhancing the resolution of OCT measurements. This laser concatenation method is demonstrated ...

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      Mentions: Dennis Derickson
    5. 100 kHz axial scan rate swept-wavelength OCT using sampled grating distributed Bragg reflector lasers

      100 kHz axial scan rate swept-wavelength OCT using sampled grating distributed Bragg reflector lasers

      Fast wavelength tunable sampled grating distributed Bragg reflector (SG-DBR) lasers are used to generate fast, linear, continuous wavelength sweeps. High resolution wavelength sweeps in excess of 45 nm are demonstrated at a 100 kHz repetition rate. The front mirror, back mirror and phase segment tun ... [Proc. SPIE 7168, 716825 (2009)] published Fri Feb 20, 2009.

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      Mentions: Dennis Derickson
    6. SGDBR single-chip wavelength tunable lasers for swept source OCT

      SGDBR single-chip wavelength tunable lasers for swept source OCT

      Sampled Grating Distributed Bragg Reflector (SGDBR) monolithic tunable lasers are now entering the production phase in telecommunications applications. These tunable lasers are unique in that they offer wide wavelength tuning (1525 to 1565 nm), fast wavelength tuning (5 ns) and high speed amplitude modulation all on the same monolithic chip 1,2,3,4 . This work studies the applicability of SGDBR monolithic tunable laser diodes for biomedical imaging using swept-wavelength or Fourier domain optical coherence tomography. This paper will present our work involved with utilizing the strengths (table 1) of this SGDBR laser class and mitigating the weaknesses (table 2 ...

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      Mentions: Dennis Derickson
    1-6 of 6
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    1. (6 articles) Dennis Derickson
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    SGDBR single-chip wavelength tunable lasers for swept source OCT 100 kHz axial scan rate swept-wavelength OCT using sampled grating distributed Bragg reflector lasers High-speed concatenation of frequency ramps using sampled grating distributed Bragg reflector laser diode sources for OCT resolution enhancement All-semiconductor high-speed akinetic swept-source for OCT System and method for generating an optimum side-mode suppression ratio continuous tuning path for a semiconductor tunable laser System and method of dynamic and adaptive creation of a wavelength continuous and prescribed wavelength versus time sweep from a laser Measurement of the Shrinkage of Natural and Simulated Lesions on Root Surfaces using CP-OCT Optic-Net: A Novel Convolutional Neural Network for Diagnosis of Retinal Diseases from Optical Tomography Images Double layer sign: A new optical coherence tomography finding in active tubercular serpiginous-like choroiditis to monitor activity Influence of Epiretinal Membranes on the Retinal Nerve Fiber Layer Thickness Measured by Spectral Domain Optical Coherence Tomography in Glaucoma High signal-to-noise ratio reconstruction of low bit-depth optical coherence tomography using deep learning New Method of Quantitative Analysis of Hard Exudate Using Optical Coherence Tomography: Application in Diabetic Macular Edema