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Proceedings Paper

Passively Q-switched Yb:YAG micro-laser for high peak power high repetition rate burst of pulses emission
Author(s): P. Bourdon; C. Planchat; D. Fleury; J. Le Gouet; F. Gustave; A. Dolfi-Bouteyre; L. Lombard; H. Jacqmin; A. Durécu
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Paper Abstract

Engine ignition using a laser requires very high peak power levels, that can be produced by solid-state lasers such as Yb:YAG passively Q-switched lasers. We developed high repetition rate diode pumped Yb:YAG micro-lasers to study the effect of cumulated pulses on the engine ignition process. The Yb:YAG laser oscillator is pumped by a 5-Hz quasi-continuous wave diode laser emitting 3-ms long pump pulses with up to 20 W peak power. It’s passively Q-switched using a Cr:YAG crystal. Various Yb:YAG dopant concentrations and crystal length have been tested and different initial transmittance values for the Cr:YAG crystal have been compared. As a result of quasi-continuous wave pumping and passive Q-switching, bursts of short pulses are emitted at the 5-Hz repetition frequency of the long pump pulses. The control of the intra-burst repetition rate is achieved through tuning the pump power between a few watts and 20 W. The energy per pulse ranges from 250 μJ to 300 μJ, with a lower than 5 ns pulse duration. The intra-burst repetition rate can go up to 20 kHz. An amplifying stage comprised of one single Yb:YAG crystal is added after this laser oscillator.

Paper Details

Date Published: 9 October 2018
PDF: 9 pages
Proc. SPIE 10797, Technologies for Optical Countermeasures XV, 1079707 (9 October 2018); doi: 10.1117/12.2325719
Show Author Affiliations
P. Bourdon, ONERA (France)
C. Planchat, ONERA (France)
D. Fleury, ONERA (France)
J. Le Gouet, ONERA (France)
F. Gustave, ONERA (France)
A. Dolfi-Bouteyre, ONERA (France)
L. Lombard, ONERA (France)
H. Jacqmin, ONERA (France)
A. Durécu, ONERA (France)

Published in SPIE Proceedings Vol. 10797:
Technologies for Optical Countermeasures XV
David H. Titterton; Robert J. Grasso; Mark A. Richardson, Editor(s)

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