Bismuth Fluorophosphate Glasses

 

Optical	FROM	TO
nF (486 nm)	1.63566	1.6776
nD (589 nm)	1.62638	1.6539
nC (656 nm)	1.62288	1.6453
Abbe number	20	49
Stimulated emission cross section	1.37 pm2 at lasing wavelength 996 nm
Gain coefficient	G = 1.65 ms pm4
Quantum efficiency	93% for 1% dopant
Transparency range (nm)	250	6000
Specroscopic quality factor "Q"	2.53
Physical	FROM	TO
Knoop hardness	365	380
Density (g/cc)	4.71	4.8
Chemical durability	(stable/no leaching)
Tg ©	480	500

Glass Irradiation Report

Using the model 37-443 radiochromic densitometer the optical density of the glass sample before irradiations was measured. The irradiations were done at a dose rate of 156 rads per second using the model 81-22 Cobalt 60 Gamma-ray radiation source. Sample Size 5 mm X 5 mm X 3 mm.

Table shows the results of the irradiations

Sample Bismuth Fluorophosphate Glasses			Visible Part of Spectra
Total Dose (K rads)	Dose Time (Minutes)	Optical Density	Sample Light Transmission (Percent)	Change (Percent)
0	0	0.05	98.9	0
20	2.14	0.05	98.9	0
50	3.21	0.06	98.67	0.23
100	5.34	0.06	98.67	0.23
200	10.68	0.07	98.44	0.46

Absorption cross section and measured emission cross section of Er³

Emission spectra of 1.0 wt% Nd₂O₃ doped BBBM glass system as a function of pumping power.

Absorption spectra of 3 wt% Nd³⁺ doped BBBM .

Fluorescence decay curves of Nd³⁺ for the ⁴F_3/2 → ⁴I_11/2
transition at room temperatures a function of concentration in the BBBM glass system