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Frequency stabilisation of Q-switched Nd:YAG oscillators for airborne and spaceborne LIDAR systems

Nicklaus, K. und Morasch, V. und Hoefer, M. und Luttmann, J. und Vierkötter, M. und Ostermeyer, M. und Höffner, J. und Lemmerz, Christian und Hoffmann, D. (2007) Frequency stabilisation of Q-switched Nd:YAG oscillators for airborne and spaceborne LIDAR systems. Proceedings of SPIE - The International Society for Optical Engineering, 6451, 64511L-1. DOI: 10.1117/12.701187. ISSN 0277-786X.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Frequency stabilisation of Q-switched Nd:YAG oscillators for airborne and spaceborne LIDAR systems
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Nicklaus, K.Fraunhofer Inst. for Laser Technology, Aachen
Morasch, V.Fraunhofer Inst. for Laser Technology, Aachen
Hoefer, M.Fraunhofer Inst. for Laser Technology, Aachen
Luttmann, J.Fraunhofer Inst. for Laser Technology, Aachen
Vierkötter, M.Fraunhofer Inst. for Laser Technology, Aachen
Ostermeyer, M.Univ. of Potsdam
Höffner, J.Univ. Rostock
Lemmerz, ChristianDLR, IPA
Hoffmann, D.Fraunhofer Inst. for Laser Technology, Aachen
Datum:2007
Erschienen in:Proceedings of SPIE - The International Society for Optical Engineering
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:6451
DOI :10.1117/12.701187
Seitenbereich:64511L-1
ISSN:0277-786X
Status:veröffentlicht
Stichwörter:lidar, ADM-aeolus, earthcare, frequency stabilisation, PDH, ramp-fire
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt ADM II (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Jana Freund
Hinterlegt am:17 Sep 2007
Letzte Änderung:27 Feb 2015 16:08

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