Journal article
Optical amplification in spiro-type molecular glasses



Publication Details
Authors:
Salbeck, J.; Schörner, M.; Fuhrmann, T.
Publication year:
2002
Journal:
Thin Solid Films
Pages range:
20-25
Volume number:
417
Start page:
20
End page:
25
ISSN:
0040-6090

Abstract
We present measurements of amplified spontaneous emission (ASE) in films of spiro-sexipheryl and higher branched spiro, starburst compounds of the 1st and 2nd generation. Gain narrowing is observed at threshold intensities of approximately 3.2 muJ/cm 2 when pumped with 500 ps pulses at 337 nm. A comparison of ASE peak wavelengths, linewidths and degradation kinetics in air is presented for the different spiro, compounds. The ASE lines are the 1-0 fluorescence transitions of the three compounds at 419, 428 and 443 nm, respectively, with linewidths of approximately 3 nm. The dependence of ASE threshold on film thickness is explained in terms of waveguide optics. The lowest threshold is achieved for monomode films (100-150 nm). Photodegradation effects occur in air atmospheres but can be suppressed in oxygen-free environments. (C) 2002 Elsevier Science B.V. All rights reserved.

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