YANG Jian-hu, DAI Shi-xun, LI Shun-guang, HU Li-li, JIANG Zhong-hong. Spectroscopic Properties and Energy Transfer of Erbium-doped Tellurite Glass[J]. Chinese Journal of Luminescence, 2002,23(5): 485-490
YANG Jian-hu, DAI Shi-xun, LI Shun-guang, HU Li-li, JIANG Zhong-hong. Spectroscopic Properties and Energy Transfer of Erbium-doped Tellurite Glass[J]. Chinese Journal of Luminescence, 2002,23(5): 485-490DOI:
ion in tellurite glass were investigated. The peak absorption were marked according to the absorption transition of Er
3+
and Yb
3+
the energy levels of Er
3+
and Yb
3+
ions in tellurite glass were obtained according to the absorption spectra. The emission spectrum of Er
3+
ion in tellurite glass was studied. The stimulated emission cross section was calculated using McCumber theory and the FWHM was obtained according to the emission spectrum. Er
3+
ion show higher emission cross section(σp=7.5×10
-21
cm
2
) and larger FWHM (FWHM=66nm) in tellurite glass than those in other glass hosts
which are very important parameters for optical amplifiers to realize broadband and high gain amplification. The upconversion spectra of Er
3+
ion in tellurite glasses were measured and analyzed. The much lower phonon energy of tellurite glass makes it has different upconversion mechanism compared with other glasses with relative higher phonon energy. The relative longer lifetime of
4
I
11/2
level of Er
3+
ion in tellurite glass produces the upconversion process
4
I
11/2
+
4
I
11/2
→
4
F
7/2
+
4
I
15/2
much more serious
and the four emission transitions
4
F
7/2
→
4
I
15/2
2
H
11/2
→
4
I
15/2
4
S
3/2
→
4
I
15/2
and
4
F
9/2
→
4
I
15/2
which corresponds to 486
530
550.and 660nm emission
respectively
become obvious. Furthermore
the upconversion intensity enhances with the increase of Yb
3+
concentration. Upconversion emission is very harmful for fiber amplifiers
which not only reduces the efficiency of bump light
but also deteriorates the noise figure of the amplifiers
so it is important to reduce upconversion phenomenon as much as possible. The energy transfer mechanism between Er
3+
and Yb
3+
ion were analyzed. The energy transfer coefficients and efficiencies between Yb
3+
and Er
3+
were calculated. At a certain Yb
3+
concentration
the forward energy transfer coefficient and efficiency hardly change while the back energy transfer coefficient and efficiency increase monotonically. So the effective sensitization of Yb
3+
to Er
3+
is appropriate only at a certain range of Yb
3+
concentration. The right selection of Yb
3+
concentration is needed in order to realize effective bump.
关键词
光谱性质碲酸盐玻璃能量传递Er3+离子
Keywords
spectroscopic propertiestellurite glassenergy transferEr3+ ion