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The photonic properties of two classes of wavelength-sized cavities are reported for deeply etched InP/InGaAsP/InP planar photonic crystals. The high aspect, deeply etched structures are studied as po...
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Changes to the network structure of Er–Yb doped phosphate glass induced by femtosecond laser pulses

J. Appl. Phys. 106, 083107 (2009); doi:10.1063/1.3246842

Published 26 October 2009

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Luke B. Fletcher,1 Jon J. Witcher,1 Wilbur B. Reichman,1 Alan Arai,2 Jim Bovatsek,2 and Denise M. Krol1
1Department of Applied Science, University of California Davis, One Shields Ave., Davis, California 95616, USA
2IMRA America, Applications Research Laboratory, 48834 Kato Rd., Suite 106A, Fremont, California 94538, USA
Changes to the glass network structure after modification with tightly focused 1043  nm, 400  fs laser pulses have been studied in Er–Yb doped phosphate glass using in situ confocal Raman microscopy. For femtosecond laser writing conditions that result in heat accumulation, the 710 and 1209  cm−1 Raman peaks, which are due to the (POP)sym and (PO2)sym network vibration modes, respectively, shift to both higher and lower wavenumbers. The differences in refractive index are shown to correlate spatially with the 1209  cm−1 Raman signal shifts. Systematic shifts in this Raman peak to higher and lower wavenumbers indicate an overall expansion and/or contraction of the phosphate network that depends on the femtosecond laser writing conditions. ©2009 American Institute of Physics
History: Received 23 July 2009; accepted 14 September 2009; published 26 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/083107/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.43.Fs
    Structure of glasses
  • 78.47.J-
    Ultrafast pump/probe spectroscopy (<1 ps) in condensed matter
  • 78.30.Ly
    Infrared and Raman spectra in disordered solids
  • 78.20.Ci
    Optical constants
  • 63.50.Lm
    Vibrational states in glasses and amorphous solids
  • YEAR: 2009

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ISSN:
0021-8979 (print)   1089-7550 (online)
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