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Water Vapour Differential Absorption Lidar measurements at 935 nm using a Nd:YGG laser

Fix, Andreas and Löhring, Jens and Meissner, Ansgar and Hoffmann, Dieter and Ehret, Gerhard and Alpers, Matthias (2010) Water Vapour Differential Absorption Lidar measurements at 935 nm using a Nd:YGG laser. In: Reviewed and revised papers presented at the 25th International Laser Radar Conference. 25th International Laser Radar Conference, 5.-9. Jul. 2010, St. Petersburg, Russia. ISBN 978-5-94458-109-9.

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Abstract

A novel diode-pumped, single-frequency laser system emitting at 935 nm was developed to serve as the transmitter for water differential absorption lidar measurements. This laser uses Nd:YGG (Y3Ga5O12) as the active medium. The system was directly diode-pumped at 806 nm and was built up in a master-oscillator power-amplifier configuration. It consists of a stable resonator in rod geometry and employs as the amplifier a stable-unstable hybrid resonator in an end-pumped slab design. Single frequency operation is achieved by injection seeding. The range of continuously tunable single-frequency radiation extends to ~0.4 nm centered around 935.31 nm. More than 30 mJ of pulse energy at 100 Hz repetition rate with a beam quality (M2) of better than 1.4 and Q-switched pulse duration of 52 ns in single frequency mode were generated. Since water vapor DIAL demands for stringent requirements for the spectral properties those were carefully investigated. Values of the spectral purity of >99.995% were determined using long-pass absorption measurements in the atmosphere exceeding the requirements by a large margin. Finally, first time water vapor DIAL measurements were performed using a Nd:YGG laser. The reported results show much promise of these directly pumped lasers at 935 nm for future space-borne and airborne water vapor lidar systems.

Document Type:Conference or Workshop Item (Poster)
Title:Water Vapour Differential Absorption Lidar measurements at 935 nm using a Nd:YGG laser
Authors:
AuthorsInstitution or Email of Authors
Fix, AndreasDLR
Löhring, JensILT
Meissner, AnsgarILT
Hoffmann, DieterILT
Ehret, GerhardDLR
Alpers, MatthiasDLR
Date:5 July 2010
Journal or Publication Title:Reviewed and revised papers presented at the 25th International Laser Radar Conference
ISBN:978-5-94458-109-9
Status:Published
Keywords:Lidar, Laser, Wasserdampf
Event Title:25th International Laser Radar Conference
Event Location:St. Petersburg, Russia
Event Type:international Conference
Event Dates:5.-9. Jul. 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt WALES (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Andreas Fix
Deposited On:06 Dec 2010 16:59
Last Modified:06 Dec 2010 17:00

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