Overview
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Antoine HIRTH: Doctor of Physics - Head of the Optronics and Laser Physics group at the Franco-German Research Institute, Saint-Louis
INTRODUCTION
Among laser sources, it is those based on solid materials that are currently seeing the most spectacular developments. The progress made is mainly due to three factors:
the development of new materials resulting from the crystallogenesis of new crystalline matrices with different dopants;
laser diode pumping, which, compared with incoherent lamp pumping, delivers high efficiencies (up to 20%), longer life and smaller footprint;
the use of the non-linear properties of certain crystals to modify the fundamental wavelengths emitted so as to cover the entire spectrum from UV to mid-IR (200 nm to 12 µm).
The various techniques for shaping the time of laser emissions (modulation, triggering and mode coupling) applied to solid-state sources make it possible to obtain all desired operating modes: continuous or repetitive pulsed operation at high rates, with pulse durations in the femtosecond range (10 –15 s).
Readers are referred to the articles in this treatise:
Laser physics ;
Gas lasers .
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