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Diode‑pumped Alexandrite laser for next generation satellite‑based earth observation lidar

: Strotkamp, Michael; Munk, Alexander; Jungbluth, Bernd; Hoffmann, Hans-Dieter; Höffner, Josef

Fulltext ()

CEAS space journal 11 (2019), No.4, pp.413-422
ISSN: 1868-2510
ISSN: 1868-2502
Journal Article, Electronic Publication
Fraunhofer ILT ()
Alexandrite laser; diode-pumped laser; q-switched laser; Lidar

In this work, the design of a diode-pumped Alexandrite ring laser in Q-switched single-longitudinal-mode (SLM) operation for a space borne lidar mission is presented. The laser is pumped by a self-developed fiber-coupled laser diode pump device and yields a pulse energy of 1.7 mJ at a repetition rate of 500 Hz with an excellent beam quality of M2 < 1.1. By seeding the resonator with a narrow band diode laser, SLM operation with a linewidth of approximately 10 MHz is achieved. The electro optical efficiency of 2% is the highest achieved for all Alexandrite lasers in SLM operation and reasonable for space operation. The performance analysis as well as benchmarking with the space-qualified mounting technology points out the TRL and the remaining effort for the development of the technology. An estimation of the requirements for a space borne resonance lidar mission underlines the suitability of such a lidar system with a diode-pumped Alexandrite laser as the beam source.