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Diode-pumped single-frequency-Nd:YGG-MOPA for water-vapor DIAL measurements: Design, setup and performance

: Löhring, J.; Meissner, A.; Hoffmann, D.; Fix, A.; Ehret, G.; Alpers, M.

Postprint urn:nbn:de:0011-n-1710507 (26 MByte PDF)
MD5 Fingerprint: a15dae97e53322e852a5b749ac5873d1
The original publication is available at
Erstellt am: 17.5.2012

Applied Physics. B 102 (2011), Nr.4, S.917-935
ISSN: 0340-3793
ISSN: 0721-7269
ISSN: 0946-2171
ISSN: 1432-0649
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ILT ()

A diode-pumped Q-switched and injection-seeded single-frequency laser, generating tunable laser radiation at 935 nm, is presented. Using Nd:YGG (Y 3Ga5O12) as the active medium, the laser that was developed to serve as a transmitter for water-vapor lidar measurements. The configuration consists of a stable resonator in rod geometry that is injection seeded by a narrowband diode laser and stabilized by the ramp-and-fire technique. Energy scaling was done in a power amplifier in slab geometry. Both oscillator and amplifier crystal were diode pumped at 806 nm. More than 30 mJ pulse energy at 100 Hz repetition rate with a beam propagation factor of M 2 < 1.4 and pulse duration of 52 ns in single-frequency mode were generated. To our knowledge this is the first direct generation of 935 nm Q-switched pulses from Nd:YGG suitable for water-vapor measurements. The reported results show great promise of this laser in applications where high efficiency and reduced complexity is indispensable, such as for spaceborne or airborne water-vapor lidar instruments.