Theoretical analysis of doping management

Abstract

Two opposing requirements, such as thermal load and nonlinear effects are important limitations in rapid progress of high-power fiber laser technologies. Thermal effects, which limit the average power, can be minimized by using low-doped, longer gain fibers, whereas presence of nonlinear effects requires use of high-doped, shorter fibers to maximize the peak power. Proposed solution of the problem is the use of varying doping levels along the gain fiber to circumvent to mitigate the trade-off between thermal load and nonlinear effects.

Theoretical analysis of doping management and its effects on power scaling

“…In order to support this opinion as well as achieve minimal thermal rise along the z axis the absorption coefficients, which rise between 0.01 and 0.4, are represented by modified logarithm, modified exponential and linear functions, respectively. The functions are given in polynomial forms given below and also represented in Figure 4.a [47]. Generally, all of the results show important temperature drop, verifying the idea that doping management can be used in thermal management.…”

“…The functions are given in polynomial forms given below and also represented in Figure 4.a [47]. Figure 4.a.…”

“…(22), (23), (31), and (33), 3-D analytical solutions for the temperature distribution at core and clad regions, respectively, for variable absorption coefficient, are obtained as follows [47]:…”