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  • 2005-2009  (14)
  • 1
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    One-Joule-per-Pulse Q-Switched 2-micron Solid State Laser (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Q-switched output of 1.1 J per pulse at 2-micron wavelength has been achieved in a diode pumped Ho:Tm:LuLF laser using a side-pumped rod configuration in a Master-Oscillator-Power-Amplifier (MOPA) architecture. This is the first time that a 2-micron laser has broken the Joule per pulse barrier for Q-switched operation. The total system efficiency reaches 5% and 6.2% for single and double pulse operation, respectively. The system produces excellent 1.4 times of transform limited beam quality.
    Keywords: Lasers and Masers
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    WIND MEASUREMENTS WITH HIGH-ENERGY DOPPLER LIDAR (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: Coherent lidars at 2-micron wavelengths from holmium or thulium solid-state lasers have been in use to measure wind for applications in meteorology, aircraft wake vortex tracking, and turbulence detection [1,2,3] These field-deployed lidars, however, have generally been of a pulse energy of a few millijoules, limiting their range capability or restricting operation to regions of high aerosol concentration such as the atmospheric boundary layer. Technology improvements in the form of high-energy pulsed lasers, low noise detectors, and high optical quality telescopes are being evaluated to make wind measurements to long ranges or low aerosol concentrations. This research is aimed at developing lidar technology for satellite-based observation of wind on a global scale. The VALIDAR project was initiated to demonstrate a high pulse energy coherent Doppler lidar. VALIDAR gets its name from the concept of validation lidar, in that it can serve as a calibration and validation source for future airborne and spaceborne lidar missions. VALIDAR is housed within a mobile trailer for field measurements.
    Keywords: Communications and Radar
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Compact and Rugged Transceiver for Coherent Doppler Wind Lidar Applications in Space (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: High-accuracy, vertical profiles of the horizontal vector wind in earth s atmosphere, with the global coverage of an orbiting sensor, are a highly desired measurement of NASA, NOAA, and many other agencies and countries. It is the consensus of NASA and NOAA that the most cost effective, lowest risk measurement method with the earliest achievable mission date is the hybrid Doppler lidar method which utilizes both coherent- and direct-detection Doppler lidars to obtain the desired profiles. NASA Langley Research Center (LaRC) has advanced the 2-micron pulsed solid-state laser greatly over the past 15 years and has recently demonstrated 1.2 J of pulse energy whereas the requirement for a 400-km hybrid Doppler lidar mission is only 0.25 J. The IIP project reported here is an effort to increase the ruggedness and to compactly package the LaRC state-of-the-art laser technology.
    Keywords: Lasers and Masers
    Type: Paper No. B11P4 , 1st Annual NASA Science Technology Conference; Jun 19, 2007 - Jun 21, 2007; Adelphi, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    2.5 MHz Line-Width High-energy, 2 Micrometer Coherent Wind Lidar Transmitter (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: 2 micron solid-state lasers are the primary choice for coherent Doppler wind detection. As wind lidars, they are used for wake vortex and clear air turbulence detection providing air transport safety. In addition, 2 micron lasers are one of the candidates for CO2 detection lidars. The rich CO2 absorption line around 2 micron, combined with the long upper state life of time, has made Ho based 2 micron lasers a viable candidate for CO2 sensing DIAL instrument. The design and fabrication of a compact coherent laser radar transmitter for Troposphere wind sensing is under way. This system is hardened for ground as well as airborne applications. As a transmitter for a coherent wind lidar, this laser has stringent spectral line width and beam quality requirements. Although the absolute wavelength does not have to be fixed for wind detection, to maximize return signal, the output wavelength should avoid atmospheric CO2 and H2O absorption lines. The base line laser material is Ho:Tm:LuLF which is an isomorph of Ho:Tm:YLF. LuLF produces 20% more output power than Ho:Tm:YLF. In these materials the Tm absorption cross-section, the Ho emission cross-section, the Tm to Ho energy transfer parameters and the Ho (sup 5) I (sub 7) radiative life time are all identical. However, the improved performance of the LuLF is attributed to the lower thermal population in the (sup 5) I (sub 8) manifold. It also provides higher normal mode to Q-switch conversion than YLF at high pump energy indicating a lower up-conversion. The laser architecture is composed of a seed laser, a ring oscillator, and a double pass amplifier. The seed laser is a single longitudinal mode with a line width of 13 KHz. The 100mJ class oscillator is stretched to 3 meters to accommodate the line-width requirement without compromising the range resolution of the instrument. The amplifier is double passed to produce greater than 300mJ energy.
    Keywords: Lasers and Masers
    Type: CLEO/QELS 07 - Conference on Lasers and Electro-Optics and Quantum Electronics and Laser Science Conference; May 06, 2007 - May 11, 2007; Baltimore, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Compact, Engineered, 2-Micron Coherent Doppler Wind Lidar Prototype for Field and Airborne Validation: Doppler Aerosol WiNd Lidar (DAWN). Interim Review #1 (6 months) (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new project, selected in 2005 by NASA's Science Mission Directorate (SMD), under the Instrument Incubator Program (IIP), will be described. The 3-year effort is intended to design, fabricate, and demonstrate a packaged, rugged, compact, space-qualifiable coherent Doppler wind lidar (DWL) transceiver capable of future validation in an aircraft and/or Unmanned Aerial Vehicle (UAV). The state-of-the-art 2-micron coherent DWL breadboard at NASA/LaRC will be engineered and compactly packaged consistent with future aircraft flights. The packaged transceiver will be integrated into a coherent DWL system test bed at LaRC. Atmospheric wind measurements will be made to validate the packaged technology. This will greatly advance the coherent part of the hybrid DWL solution to the need for global tropospheric wind measurements.
    Keywords: Earth Resources and Remote Sensing
    Type: IIP-04-0072 , Interim Review #1 , 23rd International Laser Radar Conference (ILRC23); Jul 24, 2006 - Jul 28, 2006; Nara; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    IIP Update: A Packaged Coherent Doppler Wind Lidar Transceiver. Doppler Aerosol WiNd Lidar (DAWN) (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The state-of-the-art 2-micron coherent Doppler wind lidar breadboard at NASA/LaRC will be engineered and compactly packaged consistent with future aircraft flights. The packaged transceiver will be integrated into a coherent Doppler wind lidar system test bed at LaRC. Atmospheric wind measurements will be made to validate the packaged technology. This will greatly advance the coherent part of the hybrid Doppler wind lidar solution to the need for global tropospheric wind measurements.
    Keywords: Communications and Radar
    Type: Working Group on Space-Based Lidar Winds; Jun 27, 2006 - Jun 30, 2006; Welches, OR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    High Energy 2-micron Laser Developments (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation shows the development of 2-micron solid state lasers. The topics covered include: 1) Overview 2-micron solid state lasers; 2) Modeling and population inversion measurement; 3) Side pump oscillator; and 4) One Joule 2-m Laser.
    Keywords: Lasers and Masers
    Type: 20th Annual Solid State and Diode Laser Technology Review; Jun 25, 2007 - Jun 28, 2007; Los Angeles, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Advanced 2-micron Solid-state Laser for Wind and CO2 Lidar Applications (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Significant advancements in the 2-micron laser development have been made recently. Solid-state 2-micron laser is a key subsystem for a coherent Doppler lidar that measures the horizontal and vertical wind velocities with high precision and resolution. The same laser, after a few modifications, can also be used in a Differential Absorption Lidar (DIAL) system for measuring atmospheric CO2 concentration profiles. The world record 2-micron laser energy is demonstrated with an oscillator and two amplifiers system. It generates more than one joule per pulse energy with excellent beam quality. Based on the successful demonstration of a fully conductive cooled oscillator by using heat pipe technology, an improved fully conductively cooled 2-micron amplifier was designed, manufactured and integrated. It virtually eliminates the running coolant to increase the overall system efficiency and reliability. In addition to technology development and demonstration, a compact and engineering hardened 2-micron laser is under development. It is capable of producing 250 mJ at 10 Hz by an oscillator and one amplifier. This compact laser is expected to be integrated to a lidar system and take field measurements. The recent achievements push forward the readiness of such a laser system for space lidar applications. This paper will review the developments of the state-of-the-art solid-state 2-micron laser.
    Keywords: Lasers and Masers
    Type: SPIE 5th International Symposium on Asia-Pacific Remote Sensing Conference 2006; Nov 13, 2006 - Nov 17, 2006; Goa; India
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    High-Energy 2-Micrometers Doppler Lidar for Wind Measurements (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: High-energy 2-micrometer wavelength lasers have been incorporated in a prototype coherent Doppler lidar to test component technologies and explore applications for remote sensing of the atmosphere. Design of the lidar is presented including aspects in the laser transmitter, receiver, photodetector, and signal processing. Calibration tests and sample atmospheric data are presented on wind and aerosol profiling.
    Keywords: Lasers and Masers
    Type: LAR-16099-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    High Energy 2-Micron Laser Developments (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A master oscillator power amplifier, high energy Q-switched 2-micron laser system has been recently demonstrated. The laser and amplifiers are all designed in side-pumped rod configuration, pumped by back-cooled conductive packaged GaAlAs diode laser arrays. This 2-micron laser system provides nearly transform limited beam quality.
    Keywords: Lasers and Masers
    Type: SSDLTR2007-Yu , LF99-5235 , Annual Solid State and Diode Laser Technology Review; Jun 25, 2007 - Jun 28, 2007; Los Angeles, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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