Table 3. Summary of the active fiber length, pumping wavelength, laser threshold, maximum laser output power, and slope efficiency of various fiber lasers.

Active fiber	Fiber length (cm)	Pumping wavelength (nm)	Laser threshold (mW)	Maximum output power (mW)	Slope efficiency	Reference
Silica fiber	~5.0	790	59	1	0.2	43
Tellurite fiber	2.0	1590	260	5	~3%	44
Siliate fiber	2.0	1575	300	~40	37%	45
Germanate fiber	9.6	1568	140	140	7.6%	14
BGG fiber	10	1568	250	165	17%	This work
BGG fiber	1.6	1568	130	35	5.5%	This work