• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2008.tde-02092009-150039
Document
Author
Full name
Marco Antonio Ferrari
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Wetter, Niklaus Ursus (President)
Cruz, Flávio Caldas da
Landulfo, Eduardo
Title in Portuguese
Laser de Nd:YLF para aplicações em LIDAR
Keywords in Portuguese
diode pumped
high power
Laser
Abstract in Portuguese
A utilização de lasers de estado sólido bombeados por diodos laser tem atraído interesse crescente devido a sua alta eficiência, seu tamanho compacto e com a possibilidade da operação com altas potências-pico. O objetivo deste trabalho foi estudar configurações de cavidades ressonantes laser, que possibilitem a obtenção de pulsos chaveados Q e futura dobra de freqüência, para aplicações em LIDAR (Light Detection and Ranging), utilizando como meio ativo cristais de Nd:YLF crescidos pelo método de Czochralski no Centro de Lasers e Aplicações IPEN USP, com bombeio lateral por diodo laser, com uma, duas, quatro e nove reflexões internas totais do feixe laser na superfície do cristal. Das seis cavidades construídas, três cavidades foram desenvolvidas para operarem com baixo ganho, grande armazenamento de energia e com grande aproveitamento de inversão de população, bombeadas com diodo laser em 806 nm e outras três cavidades foram desenvolvidas para operarem com alta absorção de bombeio e alto ganho, bombeadas com diodo laser emitindo em 797 nm. Das seis cavidades desenvolvidas, as que apresentaram melhor eficiência de conversão óptica, foram as cavidades operando com alto ganho e alta absorção (cavidade quatro a seis), com 29,5% e 20,7% de eficiência de conversão óptica, propiciando a obtenção de pulsos chaveados de 20 ns com potência-pico de 160kW.
Title in English
LASER DE Nd:YLF PARA APLICAÇÕES EM LIDAR
Keywords in English
diode pumped
high power
Laser
Abstract in English
The use of diode pumped, solid state lasers has caused increasing interest due its high efficiency, compactness and possibility of operation in high peak powers. The goal of this work was the study of configurations of laser resonators that allow to obtain Q-switched pulses and a future frequency doubling, for LIDAR (Light Detection and Ranging) applications. Using as active medium Nd:YLF crystals grown by the Czochralski method at the Centro de Lasers e Aplicações IPEN USP, side pumping by laser diodes, with one, two, four and nine total internal reflexions of the laser beam at the surface of the crystals was employed. From the six resonators built, three of them were designed to work with low gain, pumped by a laser diode emitting at 806 nm. Another three laser resonators were designed to work with high pump absorption and high gain, pumped by a laser diode emitting at 797 nm. From the six developed resonators, the ones which showed the best optical conversion efficiency, were the resonators designed to work with high gain and high absorption (resonator four to six), showing 29,5% and 20,7% optical conversion efficiency, and enabling obtaining Q-switched pulses of 20 ns, with 160 kW peak power.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2009-09-23
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.