Developments in Ceramic Materials Research

76
T. T. Basiev, V. A. Demidenko, K. V. Dykel’skii et al.
OPTICAL PROPERTIES OF OXYSULFIDE CERAMICS [49]
Let us first consider the optical properties of Gd2O2S:Nd 3+ (0.1 wt%) oxysulfide optical
ceramics. Transmission spectra of the samples are measured by a single-channel spectrometer
using incandescent halogen lamp. A double grating high spectral resolution DFS-12
spectrometer with 600 grooves/mm grating is used for spectral measurement. The transmitted
signal is detected by PMT-79 and is recorded using an ADC and a PC. Transmission
spectrum for the sample with thickness d = 0.175 cm at the 4 I9/2→ 4 F3/2 transition is measured
at 77 K and absorption spectrum is calculated (Figure 21a).
Fluorescence
k, cm -1
7
6
5
4
3
2
1
1-2'
2-2'
3-2'
1-1'
2-1'
3-1'
λ, nm
Gd2O2S:Nd 3+ (0.1 %)
d=0.175 cm
4
I9/2 --> 4 F3/2 T=77 K
0
880 890 900 910 920 930
2500
2000
1500
1000
500
2'-3
2'-2
2'-1
1'-1
1'-2
1'-3
λ, nm
a)
Gd 2 O 2 S:Nd 3+ (0.1 %)
4 F3/2 --> 4 I 9/2
1'-4
1'-5
T=77 K
0
880 890 900 910 920 930
Figure 21. Absorption spectrum of the Gd 2O 2S: Nd 3+ (0.1 wt%) oxysulfide optical ceramics measured at
the 4 I 9/2→ 4 F 3/2 transition of the Nd 3+ ion—a; and fluorescence spectrum at the 4 F 3/2– 4 I 9/2 transition under
812 nm CW laser excitation—b. Both spectra are at 77 K.
b)