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  • 1
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    Fiber laser development for LISA (2010)
    Institute of Physics
    Details
    Publication Date: 2010-05-01
    Print ISSN: 1742-6588
    Electronic ISSN: 1742-6596
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    Fiber Laser Development for LISA (2009)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We have developed a linearly-polarized Ytterbium-doped fiber ring laser with single longitudinal-mode output at 1064nm for LISA and other space applications. Single longitudinal-mode selection was achieved by using a fiber Bragg grating (FBG) and a fiber Fabry-Perot (FFP). The FFP also serves as a frequency-reference within our ring laser. Our laser exhibits comparable low frequency and intensity noise to Non-Planar Ring Oscillator (NPRO). By using a fiber-coupled phase modulator as a frequency actuator, the laser frequency can be electro-optically tuned at a rate of 100kHz. It appears that our fiber ring laser is promising for space applications where robustness of fiber optics is desirable.
    Keywords: Lasers and Masers
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Error Reduction Methods for Integrated-path Differential-absorption Lidar Measurements (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We report new modeling and error reduction methods for differential-absorption optical-depth (DAOD) measurements of atmospheric constituents using direct-detection integrated-path differential-absorption lidars. Errors from laser frequency noise are quantified in terms of the line center fluctuation and spectral line shape of the laser pulses, revealing relationships verified experimentally. A significant DAOD bias is removed by introducing a correction factor. Errors from surface height and reflectance variations can be reduced to tolerable levels by incorporating altimetry knowledge and "log after averaging", or by pointing the laser and receiver to a fixed surface spot during each wavelength cycle to shorten the time of "averaging before log".
    Keywords: Astrophysics; Optics
    Type: GSFC-E-DAA-TN9924 , Optics Express; 20; 14; 15589-15609
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Fiber Lasers and Amplifiers for Space-based Science and Exploration (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We present current and near-term uses of high-power fiber lasers and amplifiers for NASA science and spacecraft applications. Fiber lasers and amplifiers offer numerous advantages for the deployment of instruments on exploration and science remote sensing satellites. Ground-based and airborne systems provide an evolutionary path to space and a means for calibration and verification of space-borne systems. NASA fiber-laser-based instruments include laser sounders and lidars for measuring atmospheric carbon dioxide, oxygen, water vapor and methane and a pulsed or pseudo-noise (PN) code laser ranging system in the near infrared (NIR) wavelength band. The associated fiber transmitters include high-power erbium, ytterbium, and neodymium systems and a fiber laser pumped optical parametric oscillator. We discuss recent experimental progress on these systems and instrument prototypes for ongoing development efforts.
    Keywords: Lasers and Masers
    Type: GSFC-E-DAA-TN9927 , Proceedings of. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications; 8237; 823713
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Fiber-Based Laser Transmitter at 1.57 Micrometers for Remote Sensing of Atmospheric Carbon Dioxide from Satellites (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Over the past 20 years, NASA Goddard has successfully developed space-based lidar for remote sensing studies of the Earth and planets. The lidar in all missions to date have used diode pumped Nd:YAG laser transmitters. Recently we have been concentrating work on developing integrated path differential absorption (IPDA) lidar to measure greenhouse gases, with the goal of measurements from space. Due to the absorption spectrum of CO2 a fiber-based master oscillator power amplifier (MOPA) laser with a tunable seed source is an attractive laser choice. Fiber-based lasers offer a number of potential advantages for space, but since they are relatively new, challenges exist in developing them. In order to reduce risks for new missions using fiber-based lasers, we developed a 30- month plan to mature the technology of a candidate laser transmitter for space-based CO2 measurements to TRL-6. This work is also intended to reduce development time and costs and increase confidence in future mission success.
    Keywords: Lasers and Masers; Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN26580 , Advanced Solid State Laser (ASSL) Conference; Oct 04, 2015 - Oct 09, 2015; Berlin; Germany
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    NASA TECHNICAL REPORTS
  • 6
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    Precision and Fast Wavelength Tuning of a Dynamically Phase-Locked Widely-Tunable Laser (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We report a precision and fast wavelength tuning technique demonstrated for a digital-supermode distributed Bragg reflector laser. The laser was dynamically offset-locked to a frequency-stabilized master laser using an optical phase-locked loop, enabling precision fast tuning to and from any frequencies within a ~40-GHz tuning range. The offset frequency noise was suppressed to the statically offset-locked level in less than ~40 s upon each frequency switch, allowing the laser to retain the absolute frequency stability of the master laser. This technique satisfies stringent requirements for gas sensing lidars and enables other applications that require such well-controlled precision fast tuning.
    Keywords: Lasers and Masers
    Type: GSFC.JA.6791.2012 , Optics Express; 20; 13; 14235-14243
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Direct-detection Free-space Laser Transceiver Test-bed (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: NASA Goddard Space Flight Center is developing a direct-detection free-space laser communications transceiver test bed. The laser transmitter is a master-oscillator power amplifier (MOPA) configuration using a 1060 nm wavelength laser-diode with a two-stage multi-watt Ytterbium fiber amplifier. Dual Mach-Zehnder electro-optic modulators provide an extinction ratio greater than 40 dB. The MOPA design delivered 10-W average power with low-duty-cycle PPM waveforms and achieved 1.7 kW peak power. We use pulse-position modulation format with a pseudo-noise code header to assist clock recovery and frame boundary identification. We are examining the use of low-density-parity-check (LDPC) codes for forward error correction. Our receiver uses an InGaAsP 1 mm diameter photocathode hybrid photomultiplier tube (HPMT) cooled with a thermo-electric cooler. The HPMT has 25% single-photon detection efficiency at 1064 nm wavelength with a dark count rate of 60,000/s at -22 degrees Celsius and a single-photon impulse response of 0.9 ns. We report on progress toward demonstrating a combined laser communications and ranging field experiment.
    Keywords: Lasers and Masers
    Type: Photonics West 2008; Jan 19, 2008 - Jan 25, 2008; San Jose, CA; United States
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    NASA TECHNICAL REPORTS
  • 8
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    System and Method for Using Hollow Core Photonic Crystal Fibers (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Disclosed herein are systems and methods related to use of hollow core photonic crystal fibers. A system includes a tube and a collimating lens configured in a first end of the tube, wherein a single mode fiber is coupled to a first end of the collimating lens. A second lens is supported by a structure at a second end of the tube, the second lens receiving a first signal from a second end of the collimating lens and outputting a second signal that is coupled into a first end of a hollow core photonic crystal fiber. A first gas tube is configured to introduce gas through the structure into a chamber and a sealant seals at least one of the collimating lens and the structure within the tube. An output signal is received at a detector that catches the entire beam to suppress multiple-mode beating noise.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Multiple frequency optical mixer and demultiplexer and apparatus for remote sensing (2010)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A pulsed laser system includes a modulator module configured to provide pulsed electrical signals and a plurality of solid-state seed sources coupled to the modulator module and configured to operate, responsive to the pulsed electrical signals, in a pulse mode. Each of the plurality of solid-state seed sources is tuned to a different frequency channel separated from any adjacent frequency channel by a frequency offset. The pulsed laser system also includes a combiner that combines outputs from each of the solid state seed sources into a single optical path and an optical doubler and demultiplexer coupled to the single optical path and providing each doubled seed frequency on a separate output path.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 10
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    Continuous Carrier Optical Phase Optometric Measurement over Coherent Optical Communication Link (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: An apparatus for measuring a distance between a first and second terminal includes a frame counter for determining a number of data frames traversing a distance between the first terminal 105 and the second terminal, a frame bit counter for determining a number of data clock bits offset between a transmitted data frame and a concurrently received data frame, a data clock phase detector for determining a phase difference between an RF data clock for the transmitted data frame and an RF data clock for the concurrently received data frame, and an optical carrier phase detector for determining a phase difference between an optical carrier used to transmit the transmitted data frame and an optical carrier for the concurrently received data frame. The distance between the first and second terminal is determined from a round trip transit time T between the first and second terminals.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
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