Contribution of different factors in heat production in Yb3+-doped fiber laser: a review

The three important factors that affect the output power and temperature of fiber lasers (FLs) were investigated in a large mode area step-index FL under high-power operation. Photodarkening (PD), quantum defect (QD), background loss cause increases FLs reductions beam quality, stability, power. PD coefficients have different values for signal (laser) or pump wavelength. But QD depends on difference between laser By considering attenuation rate equations, effects forward, backward, bidirectional schemes heat distribution agents investigated. characters, including core clad sizes, both side reflectors, lengths each generation agent, studied detail.