Changes to the network structure of Er–Yb doped phosphate glass induced by femtosecond laser pulses
2009; American Institute of Physics; Volume: 106; Issue: 8 Linguagem: Inglês
10.1063/1.3246842
ISSN1520-8850
AutoresL. B. Fletcher, Jon J. Witcher, Wilbur B. Reichman, Alan Arai, Jim Bovatsek, Denise M. Krol,
Tópico(s)Glass properties and applications
ResumoChanges to the glass network structure after modification with tightly focused 1043nm, 400fs 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 1209cm−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 1209cm−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.
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