Theoretical and experimental study of dual-wavelength microlasers in continuouswave and pulsed regimes for the generation of RF and THz waves.
type: Distribution
access URL: https://theses.hal.science/tel-00877894
format: HTML
issued: 2026-05-09T05:27:22.554789
modified: 2026-05-09T05:27:22.508498

Theoretical and experimental study of dual-wavelength microlasers in continuouswave and pulsed regimes for the generation of RF and THz waves.
type: Dataset
contact point: Organization
  fn: CCSD
keyword: external-triggering
keyword: competition-de-gain
keyword: continuous-wave-laser
keyword: theses
keyword: laser-impulsionnel-a-declenchement-passif
keyword: declenchement-externe
keyword: laser-bi-longueur-donde
keyword: spiotherengineering-sciences-physicsother
keyword: infoeu-reposemanticsdoctoralthesis
keyword: radiofrequencies
keyword: terahertz-radiation
keyword: gain-competition
keyword: passive-qswitch-laser
keyword: dual-wavelength-laser
keyword: ondes-terahertz-radio-frequences
keyword: laser-continu
landing page: https://theses.hal.science/tel-00877894
description: Among the possible solutions to build terahertz sources in the 0,2 - 2 THz range,we studied the optoelectronic way consisting in the generation of a terahertz wave by photomixingtwo laser waves at optical frequencies. The work presented in this PhD concernsthe study of dual-frequency lasers able to emit the two required waves simultaneously.We begin by developing a theoretical model describing the gain competition between thelaser modes by calculating different coupling coefficients. Experimentally, we first showthat a slight misalignment of the output mirror of the laser cavity allows to obtain a stableemission at two frequencies competing in the gain medium, which is a neodymium-dopedcrystal. Then, we focus on the pulsed regime and we show that the pulses can be synchronizedby the action of an external laser. Finally, the photomixing process has been achievedand electromagnetic waves have been generated in the radio frequencies range around 20GHz.
identifier: NNT: 2012GRENT046
issued: 2026-05-09T05:27:22.525626
language: fr
modified: 2026-05-09T05:27:22.525630

test_moissonnage_selune
type: Agent