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Title: Optical characterization of femtosecond laser induced active channel waveguides in lithium fluoride crystals

We successfully realized broad-band light-emitting color center waveguides buried in LiF crystals by using femtosecond laser pulses. The characterization of the waveguides was performed by optical microscopy, photoluminescence spectra, loss measurements and near-field profiling. The experimental results show that the direct-writing fabrication process induces low-index contrast active channel waveguides: their wavelength-dependent refractive index changes, estimated from 10{sup −3} to 10{sup −4} depending on the writing conditions, allow supporting few modes at visible and near-infrared wavelengths.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Federal University of Technology–Paraná, Photonics Laboratory, 80230-901 Curitiba (Brazil)
  2. ENEA C.R. Frascati, Photonics Micro and Nanostructures Laboratory, V. E. Fermi, 45, 00044 Frascati (RM) (Italy)
  3. Universidade Federal de Pernambuco, Department of Physics, 50740-560 Recife (Brazil)
  4. Universitá degli Studi di Roma “La Sapienza,” Dipartimento di Scienze di Base e Applicate per l'Ingegneria, Via A. Scarpa, 16, 00161, Rome (Italy)
Publication Date:
OSTI Identifier:
22271236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COLOR CENTERS; CRYSTALS; EMISSION SPECTRA; FABRICATION; LASER RADIATION; LASERS; LITHIUM FLUORIDES; NEAR INFRARED RADIATION; OPTICAL MICROSCOPY; PHOTOLUMINESCENCE; REFRACTIVE INDEX; VISIBLE RADIATION; WAVEGUIDES