Chapters authored
Heat Generation and Removal in Fiber Lasers
The present chapter looks at heat generation and heat removal in fiber lasers, particularly if high–power or high–energy operation is required. In the context of the review, for the purpose of calculation of heat dissipation for different parts of the active gain media and providing effective cooling procedures, thermal loading as well as longitudinal and transverse temperature profiles of dual–clad fibers are comprehensively investigated both inside and outside of the doped fiber core. Considering numerical analysis, the heat deposited in the fiber due to pump and laser power is determined via the steady–state equations and also transient conductive, convective, as well as radiative heat transfer equations. Besides this, important features regarding how to mitigate thermal effects are stated. On the other hand, we will show that chilling mechanisms are very efficient methods for dissipating heat which is extensively adopted in high–power regimes. Finally, the concept of a cryogenic laser is discussed after propounding a novel cooling system, namely the dry–ice chiller.
Part of the book: Fiber Laser
Gain Saturation in Optical Fiber Laser Amplifiers
This chapter describes the determination of amplifying parameters in rare–earth–doped optical fiber laser amplifiers. In the context of this review, the system will be analyzed under both continuous–wave (CW) and pulse conditions. A comprehensive analysis has been implemented using the set of coupled propagation rate equations based on the atomic energy structure of dopant as well as the absorption and emission cross sections.
Part of the book: Fiber Laser