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  • 1
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    Optimization of rod diameter in solid state lasers side pumped with multiple laser diode arrays (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Results of a study to determine the optimum laser rod diameter for maximum output energy in a solid state neodymium laser transversely pumped with multiple laser diode arrays are reported here. Experiments were performed with 1.0 mm, 1.5 mm and 2.0 mm rod radii of both neodymium doped Y3Al5O12 (Nd:YAG) and La2Be2O5 (Nd:BeL) pumped with laser diode arrays having a maximum combined energy of 10.5 mJ. Equations were derived which predict the optimum rod radius and corresponding output mirror reflectivity for a given laser material and total pump energy. Predictions of the equations agreed well with the experiments for each of the laser materials which possessed significantly different laser properties from one another.
    Keywords: LASERS AND MASERS
    Type: In: Solid state lasers III; Proceedings of the Meeting, Los Angeles, CA, Jan. 20-22, 1992 (A93-53052 23-36); p. 153-165.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Long-pulse-length 2-micron diode-pumped YLiF4 laser (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A diode-pumped Ho:Tm:YLiF4 laser at room temperature has achieved an optical efficiency of 5.9 percent under normal-mode operation. Long pulse lengths, of the order of 1 microsec, have been obtained by use of 4-m ring resonator, with laser energy output of 15 mJ in single Q-switched pulses for an input energy of 2.078 J.
    Keywords: LASERS AND MASERS
    Type: Optics Letters (ISSN 0146-9592); 18; 19; p. 1636-1638.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A self-injection locked, Q-switched, line-narrowed Ti:Al2O3 laser (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Line-narrowing, Q-switched, and self-injection locking are studied independently and as a system. Line narrowing is shown both theoretically and experimentally to depend on the inverse square root of the pulse evolution time interval. Q switching of the Ti:Al2O3 laser is demonstrated and the laser output energy as a function of the Q-switch delay is investigated. Self-injection is demonstrated and the operation of the laser is explored as a function of loss and the Q-switch delay. Self-injection locking is demonstrated and the performance as a function of the Q-switch delay is determined.
    Keywords: LASERS AND MASERS
    Type: IEEE Journal of Quantum Electronics (ISSN 0018-9197); 24; 1021-102
    Format: text
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  • 4
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    Q-switched laser prelase detection circuit (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A compact electronic circuit was developed to detect prelasing in Q-swithed pulsed laser systems and once detected to shut down the laser before the next laser pulse occurs. The circuit is small, compact, and uses a minimum of components which makes it quite economical, thus readily lending itself to commercial applications. It can easily be incorporated into virtually any Q-switched laser system or reliability of a laser system by reducing a source of possible costly optical damage. The circuit operation and instrument requirements necessary to incorporate the circuit into a laser system are discussed.
    Keywords: LASERS AND MASERS
    Type: NASA, Washington, Technology 2001: The Second National Technology Transfer Conference and Exposition, Volume 1; p 485-493
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Room-Temperature, Diode-Pumped Ho:Tm:YLF Laser Amplifiers Generating 700 mJ at 2-microns (1997)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Q-switched, 400-ns pulses with output energy of 700 mJ at 2-microns, representing an optical-to-optical efficiency of 2%, was achieved from five diode-pumped Ho:Tm:YLF laser amplifiers at room-temperature.
    Keywords: Lasers and Masers
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  • 6
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    Method and apparatus for detection and control of prelasing in a Q-switched laser (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The present invention detects prelasing in a Q-switch laser and terminates laser operation upon such detection. A detector senses the presence of light beyond a Q-switch and generates an appropriate electrical signal. A comparison stage circuit compares this detector signal with an established threshold value indicative of prelasing and generates a trigger signal if this detector signal exceeds this threshold value. A control stage circuit receives both this trigger value and a sampled Q-switch signal indicative of an opening of the Q-switch. The control stage circuit terminates operation of the laser if the trigger signal from the comparison stage is received while the sampled Q-switch signal is being received to avoid the effects of prelasing. Appropriate delays and timing sequences are established.
    Keywords: LASERS AND MASERS
    Type: US-PATERNT-CLASS-372-10
    Format: application/pdf
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  • 7
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    Circuit Stops Prelasing In A Q-Switched Laser (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Protective shutdown circuit stops prelasing in Q-switched laser operating at pulse-repetition rate of about 10 Hz. During normal operation, Q-switch prevents emission of light from laser cavity during application of Q-switch-trigger pulse. When circuit detects prelasing, it triggers relay turning off laser power supply. Circuit integrated into almost any Q-switched-laser system, provided one gains access to laser light, Q-switch-trigger pulse, and safety-interlock line of laser power supply.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-14790 , NASA Tech Briefs (ISSN 0145-319X); 19; 3; P. 44
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    System and Method for Generating a Frequency Modulated Linear Laser Waveform (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-24
    Description: A system for generating a frequency modulated linear laser waveform includes a single frequency laser generator to produce a laser output signal. An electro-optical modulator modulates the frequency of the laser output signal to define a linear triangular waveform. An optical circulator passes the linear triangular waveform to a band-pass optical filter to filter out harmonic frequencies created in the waveform during modulation of the laser output signal, to define a pure filtered modulated waveform having a very narrow bandwidth. The optical circulator receives the pure filtered modulated laser waveform and transmits the modulated laser waveform to a target.
    Keywords: Lasers and Masers; Communications and Radar
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    System and Method for Generating a Frequency Modulated Linear Laser Waveform (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A system for generating a frequency modulated linear laser waveform includes a single frequency laser generator to produce a laser output signal. An electro-optical modulator modulates the frequency of the laser output signal to define a linear triangular waveform. An optical circulator passes the linear triangular waveform to a band-pass optical filter to filter out harmonic frequencies created in the waveform during modulation of the laser output signal, to define a pure filtered modulated waveform having a very narrow bandwidth. The optical circulator receives the pure filtered modulated laser waveform and transmits the modulated laser waveform to a target.
    Keywords: Communications and Radar
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  • 10
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    HO:LULF and HO:LULF Laser Materials (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A laser host material LULF (LuLiF4) is doped with holmium (Ho) and thulium (Tm) to produce a new laser material that is capable of laser light production in the vicinity of 2 microns. The material provides an advantage in efficiency over conventional Ho lasers because the LULF host material allows for decreased threshold and upconversion over such hosts as YAG and YLF. The addition of Tm allows for pumping by commonly available GaAlAs laser diodes. For use with flashlamp pumping, erbium (Er) may be added as an additional dopant. For further upconversion reduction, the Tm can be eliminated and the Ho can be directly pumped.
    Keywords: Lasers and Masers
    Format: application/pdf
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