WGLASER · Femtosecond inscription of waveguide lasers in crystals
6РП — Действия „Мария Кюри“
- Период
- 2007-09-01 → 2009-08-31
- Финансиране от ЕС
- 228 193 €
- Участници
- 1
- Схема
- IIF
Линиите свързват координатора с партньорите.
Накратко на български
Фемтосекундните лазери се използват за създаване на микроскопични канали (вълноводи) в кристали от YAG. Това позволява създаването на много компактни лазерни устройства, които работят с по-малко енергия и имат по-прецизен контрол върху светлинния им импулс.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - WGLASER (Femtosecond Inscription of Waveguide Lasers in Crystals)
An monolithic and extremely compact microchip waveguide Q-switch laser based on diffusion bonded YAG:Nd and YAG:Cr crystals was designed and fabricated. Such laser required lower pump emission power than traditional microchip laser because of an efficient coupling of the pump emission from a delivering fibre to the crystal waveguide. Owing to the waveguide design the laser kept its parameters within a wide range of repetition range, which varied from a single pulse up to 10 kHz. A waveguide saturable absorber was inscribed in the bulk of YAG:Cr4+ crystal. Such a saturable absorber was incorporated in a fibre laser by simple direct butt-coupling to a conventional Yb doped silica fibre. A Q-switched operation of a fibre laser, integrated with the waveguide saturable absorber, was also demonstrated. Experimental evidence demonstrated that both multi-photon absorption and electron plasma absorptions were responsible for energy deposition and refractive index change in wideband transparent dielectrics. The orders and absorption coefficients of the multi-photon processes and thresholds for permanent refractive index change were measured for numerous series of wideband crystals and glasses at the wavelength of 0.8 µm. It was found that a beam with elliptical cross-section was a very effective tool for femtosecond inscription because of suppression of self focusing and improved control of energy deposition process. This was a key technological trick for inscription of low loss waveguide in YAG crystals.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The major goal of the project is development of new fabrication technology for a waveguide-microchip laser. Fabrication of a compact and robust laser with monolithic cavity based on crystals doped with rare earth or transition metal ions is the target of t he project. The new design is proposed based on a combination of a microchip and a waveguide, inscribed inside of a crystal. Fabrication of the waveguide is based on a recently discovered phenomenon of a refractive index change due to irradiation of a crystal by tightly focused beam of femtosecond pulses. Primary targets of the project are pulsed lasers with high peak power, operating with sub-nanosecond pulses.Two regimes of oscillations will be comprehensively investigated within the project: Q-switching and mode locking. Primary active and saturable materials for the waveguide microchip lasers to be examined within the project are crystals of the garnet family. A nature of the refractive index change in garnet crystals will be studied by applying methods of optical spectroscopy, diffraction of electrons and electronic paramagnetic resonance. The developed technology will promote miniaturization of solid- state lasers and will facilitate its integration in electronic systems.It is fully in line with t he objectives of the sub-programme Components and Microsystems" of "Information Society Technologies", one of the main directions of 6-th EU Commission Framework Programme for Research, Technological Development and Demonstration. The proposed research is in line with the goals of the European Priority Thematic Area 1.1.3: Nano technologies and nanosciences, knowledge-based multifunctional materials and new production processes and devices."
Оригинален текст от CORDIS (на английски).
Участници
- ASTON UNIVERSITY · BIRMINGHAMКоординаторОбединеното кралство
Връзки
Данни: CORDIS, © Европейски съюз