
Proceedings Paper
Frequency stabilization of Q-switched Nd:YAG oscillators for airborne and spaceborne lidar systemsFormat | Member Price | Non-Member Price |
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Paper Abstract
Lidar Systems for the measurement of three-dimensional wind or cloud and aerosol formations in the earth atmosphere
require highly stable pulsed single frequency laser systems with a narrow line width. The lasers for ESAs ADM-Aeolus
and EarthCARE missions require frequency stabilities of 4 and 10 MHz rms at a wavelength of 355 nm and a line width
below 50 MHz at 30 ns pulse duration[1]. Transferred to the fundamental wavelength of the laser systems the stability
requirement is 1.3 and 3.3 MHz, respectively. In comparison to ground based lidar systems the vibrational load on the
laser system is much higher in airborne and spaceborne systems, especially at high frequencies of some hundred Hertz or
even some kHz. Suitable frequency stabilisation methods have therefore to be able to suppress these vibrations
sufficiently. The often used Pulse-Build-up method is not suitable, due to its very limited capability to suppress vibration
frequencies of the order of the pulse repetition frequency.
In this study the performance of three frequency stabilisation methods in principle capable to meet the requirements, the
cavity dither method, the modified Pound-Drever-Hall method and a modified Ramp-Fire method - named Ramp-Delay-
Fire - is theoretically and experimentally investigated and compared.
The investigation is performed on highly efficient, passively cooled, diode end-pumped q-switched Nd:YAG oscillators,
which are breadboard versions of the A2D (ADM-Aeolus) and possible ATLAS (EarthCARE) oscillators. They deliver
diffraction limited output pulses with up to 12 mJ pulse energy at a pulse duration of 30 ns and 100 Hz pulse repetition
rate.
Paper Details
Date Published: 9 March 2007
PDF: 12 pages
Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 64511L (9 March 2007); doi: 10.1117/12.701187
Published in SPIE Proceedings Vol. 6451:
Solid State Lasers XVI: Technology and Devices
Hanna J. Hoffman; Ramesh K. Shori; Norman Hodgson, Editor(s)
PDF: 12 pages
Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 64511L (9 March 2007); doi: 10.1117/12.701187
Show Author Affiliations
K. Nicklaus, Fraunhofer Institute for Laser Technology (Germany)
V. Morasch, Fraunhofer Institute for Laser Technology (Germany)
M. Hoefer, Fraunhofer Institute for Laser Technology (Germany)
J. Luttmann, Fraunhofer Institute for Laser Technology (Germany)
M. Vierkötter, Fraunhofer Institute for Laser Technology (Germany)
V. Morasch, Fraunhofer Institute for Laser Technology (Germany)
M. Hoefer, Fraunhofer Institute for Laser Technology (Germany)
J. Luttmann, Fraunhofer Institute for Laser Technology (Germany)
M. Vierkötter, Fraunhofer Institute for Laser Technology (Germany)
M. Ostermeyer, Univ. of Potsdam (Germany)
J. Höffner, Univ. Rostock (Germany)
Christian Lemmerz, Deutsches Zentrum für Luft- und Raumfahrt (Germany)
D. Hoffmann, Fraunhofer Institute for Laser Technology (Germany)
J. Höffner, Univ. Rostock (Germany)
Christian Lemmerz, Deutsches Zentrum für Luft- und Raumfahrt (Germany)
D. Hoffmann, Fraunhofer Institute for Laser Technology (Germany)
Published in SPIE Proceedings Vol. 6451:
Solid State Lasers XVI: Technology and Devices
Hanna J. Hoffman; Ramesh K. Shori; Norman Hodgson, Editor(s)
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