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Pompage par LED de matériaux laser émettant dans le visible ou l'infrarouge proche.

Adrien Barbet 1 
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : Since the early 2000s, the lighting market is constantly growing up, pulling the Light-Emitting Diodes (LED) performance forward and pushing their cost down. LED is becoming an interesting source of light for laser pumping, between flashlamp and laser diodes. Thus, 40 years after the first demonstration, we suggest to revisit laser LED pumping. In this work, we demonstrated for the first time a Nd:YVO4 laser directly LED-pumped. LED radiance being limited, we took interest in LED-pumped luminescent concentrators. By developing Ce:YAG concentrator, we were able to overcome the LEDs irradiance by a factor of 20, leading to output irradiances similar to the laser diode ones (of the order of multi-kW/cm²). We validated the concept by pumping for the first time a Nd:YVO4 crystal and a Nd:YAG crystal with luminescent concentrators. Output energies of several mJ were obtained. In addition, we succeeded to get a passively Q-switched regime for the Nd:YAG laser by using saturable absorbers leading to unpreceded performance for a LED-pumped laser. Finally, LED-pumped concentrators pave the way for new possibilities for high-radiance source pumped media. Our first tests on titanium doped sapphire show that a laser gain with a LED pumping is achievable.
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Submitted on : Wednesday, March 22, 2017 - 2:05:07 PM
Last modification on : Saturday, June 25, 2022 - 10:24:00 PM
Long-term archiving on: : Friday, June 23, 2017 - 1:11:29 PM


Version validated by the jury (STAR)


  • HAL Id : tel-01493949, version 1


Adrien Barbet. Pompage par LED de matériaux laser émettant dans le visible ou l'infrarouge proche.. Optique [physics.optics]. Université Paris Saclay (COmUE), 2016. Français. ⟨NNT : 2016SACLO020⟩. ⟨tel-01493949⟩



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