Average lifetime of the bands at 382 nm and 542 nm for the CaF₂ doped with different concentration of Tb³⁺ ions.

Tb concentration (mol%)	Lifetime (ms) Exc@257 nm		Lifetime (ms) Exc@486 nm	W CR (s−1)	η CR (%)
	382 nm band	542 nm band	542 nm band
0.25	8.8	22.5	15.6	—	—
0.5	8.5	21.4	14.5	4	3.4
1	8.4	20.9	13.1	5	4.5
2	7.9	20.1	11.3	13	10.2
4	7.8	17.5	10.0	15	11.4
6	7.2	17.4	9.4	25	18.2
8	6.9	14.5	8.3	31	21.6
10	6.6	12.4	7.4	38	25.0