Abstract
We present a comparative experimental analysis of the thermal spectroscopic
characteristics of a phosphosilicate (P)-based ytterbium-doped fiber (YDF) against an
aluminosilicate (Al)-based YDF in the temperature range of 25 to
150°C. We also characterize the fibers as gain media in a
cladding-pumped amplifier configuration. While both fibers exhibit comparable trends in their
thermal characteristics, there are noticeable distinctions in the fluorescence lifetime reduction
rate and the spectral dependence of the transition cross-sections. The P- and Al-based YDFs present
thermal lifetime reduction rates of 0.012%/°C and
0.026%/°C, respectively. In particular, in the spectral region at
~940 nm, the absorption cross-section of the P-based YDF undergoes significantly less thermal change
compared to that of the Al-YDF. In the cladding-pumped amplifier configuration operating at a total
gain of 10 dB, the Al-based YDF generally performs betters than the P-based YDF in the temperature
range of 25 to 75°C. However, it is highlighted that in the high
temperature range of over 75°C, the latter shows a less gain
reduction rate than the former, thereby yielding higher relative output power by 3.3% for a 1060-nm
signal, for example.
© 2013 Optical Society of Korea
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