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You searched for subject:(Femtosecond Laser Inscription). Showing records 1 – 3 of 3 total matches.

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Université de Bordeaux I

1. Choi, Ji Yeon. Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications.

Degree: Docteur es, Laser, Matière, Nanosciences, 2010, Université de Bordeaux I

A la suite de la première démonstration de l'écriture de guide d'onde au sein de verres en 1996 par laser femtoseconde, l'écriture direct par Laser Femtoseconde (Femtoseconde Direct Laser Writing - FLDW) est apparu comme une technique souple pour la fabrication de structure photonique en trois dimensions au sein de matériaux pour l'optique. La thèse a porté sur l'inscription par laser femtoseconde de fonctionnalités optiques au sein de verres. Des éléments diffractifs par modification de l'indice de réfraction et des structures présentant des propriétés de luminescence ou d'optique non linéaire d'ordre deux ont pu être obtenus au sein de matériaux vitreux et étudiés.

Since the first demonstration of femtosecond laser written waveguides in 1996, femtosecond laser direct writing (FLDW) has been providing a versatile means to fabricate embedded 3-D microstructures in transparent materials. The key mechanisms are nonlinear absorption processes that occur when a laser beam is tightly focused into a material and the intensity of the focused beam reaches the range creating enough free electrons to induce structural modification. This dissertation was an attempt to make an improvement on the existing FLDW technique to achieve a reliable fabrication protocol for integrated optical devices involving micro diffractive optical elements and laser-structures exhibiting second order nonlinear optical properties. Relaxation processes of directly-written structures in chalcogenide glasses have been also investigated.

Advisors/Committee Members: Cardinal, Thierry (thesis director), Canioni, Lionel (thesis director).

Subjects/Keywords: Verre; Inscription laser; Optique non linéaire; Eléments diffractifs; Laser femtoseconde; Glass; Direct Laser writing; Nonlinear properties; Diffractive optical elements; Femtosecond laser

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Choi, J. Y. (2010). Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2010BOR14037

Chicago Manual of Style (16th Edition):

Choi, Ji Yeon. “Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications.” 2010. Doctoral Dissertation, Université de Bordeaux I. Accessed December 13, 2019. http://www.theses.fr/2010BOR14037.

MLA Handbook (7th Edition):

Choi, Ji Yeon. “Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications.” 2010. Web. 13 Dec 2019.

Vancouver:

Choi JY. Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2010. [cited 2019 Dec 13]. Available from: http://www.theses.fr/2010BOR14037.

Council of Science Editors:

Choi JY. Ecriture par Laser de fonctionnalités optiques : éléments diffractifs et ONL : Femtosecond laser written volumetric diffractive optical elements and their applications. [Doctoral Dissertation]. Université de Bordeaux I; 2010. Available from: http://www.theses.fr/2010BOR14037


Indian Institute of Science

2. Sabapathy, Tamilarasan. Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications.

Degree: 2013, Indian Institute of Science

Chalcogenide glasses are highly nonlinear optical materials which can be used for fabricating active and passive photonic devices. This thesis work deals with the fabrication of buried, three dimensional, channel waveguides in chalcogenide glasses, using ultrafast laser inscription technique. The femtosecond laser pulses are focused into rare earth ions doped and undoped chalcogenide glasses, few hundred microns below from the surface to modify the physical properties such as refractive index, density, etc. These changes are made use in the fabrication of active and passive photonic waveguides which have applications in integrated optics. The first chapter provides an introduction to the fundamental aspects of femtosecond laser inscription, laser interaction with matter and chalcogenide glasses for photonic applications. The advantages and applications of chalcogenide glasses are also described. Motivation and overview of the present thesis work have been discussed at the end. The methods of chalcogenide glass preparation, waveguide fabrication and characterization of the glasses investigated are described in the second chapter. Also, the details of the experiments undertaken, namely, loss (passive insertion loss) and gain measurements (active) and nanoindentation studies are outlined. Chapter three presents a study on the effect of net fluence on waveguide formation. A heat diffusion model has been used to solve the waveguide cross-section. The waveguide formation in GeGaS chalcogenide glasses using the ultrafast laser, has been analyzed in the light of a finite element thermal diffusion model. The relation between the net fluence and waveguide cross section diameter has been verified using the experimentally measured properties and theoretically predicted values. Chapter four presents a study on waveguide fabrication on Er doped Chalcogenide glass. The active and passive characterization is done and the optimal waveguide fabrication parameters are given, along with gain properties for Er doped GeGaS glass. A C-band waveguide amplifier has been demonstrated on Chalcogenide glasses using ultrafast laser inscription technique. A study on the mechanical properties of the waveguide, undertaken using the nanoindentation technique, is presented in the fifth chapter. This work brings out the close relation between the change in mechanical properties such as elastic modulus and hardness of the material under the irradiation of ultrafast laser after the waveguide formation. Also, a threshold value of the modulus and hardness for characterizing the modes of the waveguide is suggested. Finally, the chapter six provides a summary of work undertaken and also discusses the future work to be carried out. Advisors/Committee Members: Asokan, S.

Subjects/Keywords: Chalcogenide Glasses; Photonic Devices; Optical Waveguides; Chalcogenide Glass Waveguide Amplifiers; Ultrafast Laser Inscription; Chalcogenide Glass Waveguides; Photonic Waveguides; Femtosecond Laser Inscription; Ultrafast Laser Inscribed Optical Waveguides; Ultrafast Laser Inscribed Chalcogenide Glasses; Photonic Integrated Circuits; Waveguide Fabrication; Chalcogenide Glass Preparation; Ultrafast Laser Inscription Technique; Erbium Doped Optical Amplifier (EDFA); Er-doped Chalcogenide Glass; Applied Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sabapathy, T. (2013). Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2845

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Sabapathy, Tamilarasan. “Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications.” 2013. Thesis, Indian Institute of Science. Accessed December 13, 2019. http://hdl.handle.net/2005/2845.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Sabapathy, Tamilarasan. “Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications.” 2013. Web. 13 Dec 2019.

Vancouver:

Sabapathy T. Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications. [Internet] [Thesis]. Indian Institute of Science; 2013. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/2005/2845.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sabapathy T. Ultrafast Laser Inscribed Waveguides on Chalcogenide Glasses for Photonic Applications. [Thesis]. Indian Institute of Science; 2013. Available from: http://hdl.handle.net/2005/2845

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Macquarie University

3. Meany, Thomas. Laser written integrated photonics for quantum information science.

Degree: 2014, Macquarie University

"A thesis submitted to Macquarie University for the degree of Doctor of Philosophy, Department of Physics and Astronomy"

"August 2014"

"Typeset in LaTeX2e"

Bibliography: pages 137-165.

1. Background to quantum information science  – 2. Background to integrated optics  – 3. Towards low loss waveguides  – 4. Multiport beamsplitters  – 5. Quantum circuits  – 6. Hybrid integration  – 7. Conclusion  – A. Appendix I: Waveguide theory  – B. Experimental methods.

This thesis details the study of quantum information science (QIS) using integrated photonics. Integrated photonic devices are fabricated in glass using the femtosecond laser direct write (FLDW) technique. This method uses a focused high power laser to produce a localised refractive index change in a glass substrate which can be used to form waveguides. A rigorous parameter study of laser inscription and glass structure is performed to isolate regions where low loss waveguides can be formed. Unique, three dimensional,circuit designs are created which are then characterised to determine symmetry and to ascertain their performance for QIS.

The circuit designs include 3D multiports which permit the unitary transformation of a set of optical modes. Single photons are injected into this device to determine its performance and compare it to bulk optic, fibre optic and lithographically fabricated examples. The 3D multiports show high fidelity operation and a comparable performance to other circuit design platforms. Building on this work which shows the high quality of laser inscribed devices, an inherently quantum circuit is designed. It has the function of operating as a basic two-qubit circuit element which applies a phase shift to a qubit in a target mode, conditional on the state of a control qubit. Thiscircuit is heralded, meaning that it operates in the presence of two additional ancilla modes which trigger the success of the probabilistic gate. The design of this circuit required detailed analysis of the reproducibility of laser written circuits in the presence of performance tolerance to fabrication imperfections.

The devices described previously were characterised, non-classically, using a bulk source of photon pairs. This limits the application of the devices beyond demonstrations or prototypes, hence it is desirable to also integrate these devices with on-chip sources of single photons. Such a source of single photons is available in the form of a quasi phase-matched nonlinear crystal which emits heralded single photons. An experiment was undertaken to design a hybrid circuit, composed of both linear and nonlinear elements to produce heralded single photons, to produce multiple sources of heralded single photons. This was completed and experiments exploiting high speed switching to combine individual sources and an experiment to manipulate photon pair states is completed.

This work builds on the knowledge of FLDW structures for on chip routing and manipulation of light. Demonstrations of integrated circuits and hybrid integrated…

Advisors/Committee Members: Macquarie University. Department of Physics and Astronomy.

Subjects/Keywords: Photonics; Photonics  – Materials; Optical waveguides  – Materials; Lasers; Optics; Quantum information; femtosecond laser direct write; FLDW; quantum information science; QIS; laser inscription; waveguide

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Meany, T. (2014). Laser written integrated photonics for quantum information science. (Doctoral Dissertation). Macquarie University. Retrieved from http://hdl.handle.net/1959.14/1141501

Chicago Manual of Style (16th Edition):

Meany, Thomas. “Laser written integrated photonics for quantum information science.” 2014. Doctoral Dissertation, Macquarie University. Accessed December 13, 2019. http://hdl.handle.net/1959.14/1141501.

MLA Handbook (7th Edition):

Meany, Thomas. “Laser written integrated photonics for quantum information science.” 2014. Web. 13 Dec 2019.

Vancouver:

Meany T. Laser written integrated photonics for quantum information science. [Internet] [Doctoral dissertation]. Macquarie University; 2014. [cited 2019 Dec 13]. Available from: http://hdl.handle.net/1959.14/1141501.

Council of Science Editors:

Meany T. Laser written integrated photonics for quantum information science. [Doctoral Dissertation]. Macquarie University; 2014. Available from: http://hdl.handle.net/1959.14/1141501

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