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Title: Fluorescence imaging of lattice re-distribution on step-index direct laser written Nd:YAG waveguide lasers

The laser performance and crystalline micro-structural properties of near-infrared step-index channel waveguides fabricated inside Neodymium doped YAG laser ceramics by means of three-dimensional sub-picosecond pulse laser direct writing are reported. Fluorescence micro-mapping of the waveguide cross-sections reveals that an essential crystal lattice re-distribution has been induced after short pulse irradiation. Such lattice re-distribution is evidenced at the waveguide core corresponding to the laser written refractive index increased volume. The waveguides core surroundings also present diverse changes including slight lattice disorder and bi-axial strain fields. The step-index waveguide laser performance is compared with previous laser fabricated waveguides with a stress-optic guiding mechanism in absence of laser induced lattice re-distribution.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ; ;  [2] ;  [5]
  1. Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049 (Spain)
  2. Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Tarragona 43007 (Spain)
  3. (United Kingdom)
  4. (Canada)
  5. Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)
Publication Date:
OSTI Identifier:
22412808
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CERAMICS; COMPARATIVE EVALUATIONS; CROSS SECTIONS; DOPED MATERIALS; FLUORESCENCE; MAPPING; MICROSTRUCTURE; NEODYMIUM LASERS; PERFORMANCE; PULSED IRRADIATION; REFRACTIVE INDEX; STRAINS; STRESSES; WAVEGUIDES